Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

[70JUDGE]

When I received the TV it wouldn't turn on.Just had the standby light.I replaced a few capacitors on the power supply board.The TV worked fine until I put the back cover on.Now it will turn on,show a picture for a few seconds,then turn off.I have tested the rest of the capacitors on the power supply with a ESR meter,and they all measured alright.I resoldered the transformers on the backlight inverter.I also tried to test the backlight inverter coils with a multimeter,but I don't know what the readings should,or shouldn't be.They have four legs on one side,and five on the other side.Two are soldered on one side,and four on the other side.I also went as far as to look at all of the backlight bulbs,and didn't see anything wrong with them either.I did try to use a working monitor to test the bulbs,but it did the same thing as the TV,shut off after a few seconds on all of the bulbs.Is it because the bulbs are not the same size?The monitor could sense the wrong bulbs?I did notice a piece of trace missing on the bottom of the power board that I fixed while replacing the bad capacitors,and two wires missing marked on the main board as GND,and CON2 that go from the mainboard to the backlight inverter.It worked with these two wires missing,so I didn't think that could be the problem.I have searched around for for other things to try,and tried some of them,but I have question as to if some of them apply to my TV,or not.Below are some of them,along with why I have question with some of them.Any help is greatly appreciated.Thank You very much!

Tyler

P.S.The power board is a VP212UG01 Ver:4.2,and the backlight inverter is a VIT71009.90(91)(50) Logah Rev:0 AUO P/N:19.26006.111.

1.Can you measure surface mount ceramic capacitors with an ESR meter?I measured some on the bottom of the power supply board,and some measured 30 ohms,and some didn't show on the scale at all.
2.How do you determine what the value,and voltage are for the surface mount ceramic capacitors,and if they are multi layer with no markings on any of them?
3.I measured the transistors/rectifiers that have the heatsinks attatched,and the ones on the power cord side measured fine,but the ones on the output side caused the meter to beep on the two outside pins.One even caused the beeping on all three of the pins.I read that if a coil,or capacitor is near,it would cause the bad readings.

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

When I received the TV it wouldn't turn on.Just had the standby light.I replaced a few capacitors on the power supply board.The TV worked fine until I put the back cover on.Now it will turn on,show a picture for a few seconds,then turn off.I have tested the rest of the capacitors on the power supply with a ESR meter,and they all measured alright.I resoldered the transformers on the backlight inverter.I also tried to test the backlight inverter coils with a multimeter,but I don't know what the readings should,or shouldn't be.They have four legs on one side,and five on the other side.Two are soldered on one side,and four on the other side.I also went as far as to look at all of the backlight bulbs,and didn't see anything wrong with them either.I did try to use a working monitor to test the bulbs,but it did the same thing as the TV,shut off after a few seconds on all of the bulbs.Is it because the bulbs are not the same size?The monitor could sense the wrong bulbs?I did notice a piece of trace missing on the bottom of the power board that I fixed while replacing the bad capacitors,and two wires missing marked on the main board as GND,and CON2 that go from the mainboard to the backlight inverter.It worked with these two wires missing,so I didn't think that could be the problem.I have searched around for for other things to try,and tried some of them,but I have question as to if some of them apply to my TV,or not.Below are some of them,along with why I have question with some of them.Any help is greatly appreciated.Thank You very much!

Tyler

P.S.The power board is a VP212UG01 Ver:4.2,and the backlight inverter is a VIT71009.90(91)(50) Logah Rev:0 AUO P/N:19.26006.111.

1.Can you measure surface mount ceramic capacitors with an ESR meter?I measured some on the bottom of the power supply board,and some measured 30 ohms,and some didn't show on the scale at all.
2.How do you determine what the value,and voltage are for the surface mount ceramic capacitors,and if they are multi layer with no markings on any of them?
3.I measured the transistors/rectifiers that have the heatsinks attatched,and the ones on the power cord side measured fine,but the ones on the output side caused the meter to beep on the two outside pins.One even caused the beeping on all three of the pins.I read that if a coil,or capacitor is near,it would cause the bad readings.

For someone who obviously knows very little about electronics and troubleshooting, you have accomplished a great deal. Let's see if we can answer some questions, then help you finish the job.

(1) Not with the usual ESR meter, but that test is meaningless for a ceramic cap. An electrolytic capacitor can have an ESR ten times it's rated value and still read it's rated capacitance. A ceramic capacitor is good if it reads it's rated capacitance; ESR is not an issue with them due to the type of construction.
(2) You can't. A parts list or schematic is the only way.
(3) I will elaborate later on the issue of measuring diodes and transistors later if you wish. In the meantime I don't have a lot of energy.

Your testing of the power supply is now a waste of time. You got a picture and had a working backlight until you put the back on. Your repair was successful to that point. Certainly it is VERY unlikely that you have any shorted rectifiers, etc in the power supply. Even the possibility that you missed a marginal capacitor in the inverter supply (24 volt?) should be ignored for the moment.

First, look for any wires you could have pinched, connectors partially dislodged, components broken, etc. Next, does the TV work properly if you remove the back again? And I am curious about the 'missing wires'.

The likely cause of the problem is the inverter. A simple test will confirm or refute this theory. On many inverters there is a legend next to the connector identifying the function of the pins. You are looking for a pin labeled On/Off, BL_ON, or some similar description. Measure the voltage on the pin when the backlights are on, and after they go off again. If it does not change, the problem is most likely with the inverter; the other (remote) possibility is the power supply.

To assist you further, I will need pictures of the inverter. Follow the link in my signature for instructions on attaching them to a post (do NOT insert them 'in line', I will get pissy and may refuse to help). One picture each of the top and bottom of the inverter, one of a transformer, and if you have been unable to identify the backlight control line, one of both the top and bottom of the connector area would be best. Take them in ambient light (close to a window is best), no flash, from as close to perpendicular as possible, and as large as possible (the site has a 2000 x 2000 pixel limit).

Also, there is a 16 to 20 pin IC on the inverter. The part number of that IC would be a big help.

PlainBill

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Sorry I haven't written in awhile.I did get to test a few things.When the TV is on I get a little over seven volts on the signal wire that goes to the inverter,but it goes to zero volts when the TV turns off with no sound,or picture,but the standby light is still off meaning the TV is still on.I don't remember if the volts were AC,or DC.If I leave the TV unplugged overnight,and turn it on the next day,it will stay on for about thirty seconds.When it turns off,and I turn it back on it will stay on for maybe ten seconds,and it gets to the point where it will only stay on for a second,or two,but it's not the same everytime.All the time it is on,I get a perfect picture,and sound.The real kicker is,sometimes if I'm not quick enough turning the TV off after it turns off by itself to get the standby light to turn on,I have to unplug it,and plug it back in to get the red standby light to turn on again.I hope that makes sense.I have replaced all of the larger capacitors on the power supply except one.It measured fine on the ESR meter,but so did one of the bulging ones.What are the odds that a capacitor measures good on the meter,but be bad under load?It almost acts like something is overheating.Not enough paste on the transistors?I thought about getting an infrared thermometer,and some freeze spray/component cooler,and see if that might help.I also noticed that the standby light/remote sensor board wires were pinched a little but they worked fine.I even went so far as to unplug them,the speakers,and the TV tuner thinking that the bent plug on the tuner might be shorting out,but it didn't help any.With the back on,or off it doesn't make any difference.Before I put the back on,I really didn't have the TV on long,just long enough to go through a few channels,and see that it worked,so I really can't say if the back had anything to do with it.The part that was making the constant beeping on my meter testing it is a MBR4045PT.Will a ESR meter test the surface mount aluminum capacitors?The ones with the plastic base.Are those considered electrolytic?Just curious what makes you think that I don't know much about electronics?Thank You very much!
Tyler

[retiredcaps]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Just a friendly suggestion.

Use paragraphs one in awhile. It is hard to read and follow along when everything is just one long sentence.

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

<SNIP>
Just curious what makes you think that I don't know much about electronics?Thank You very much!
Tyler

The fact that you were exploring problems with the power supply was a pretty good clue. Your question #1 confirmed the suspicion.

What you probably have is a bad IC on the main board. The fact that it works longer after the set cools down is a very good clue. My concern is that one of the voltage regulators on the main board is bad, and causing one of the ICs it supports to overheat.

I'll second what retiredcaps said. Take your previous post to a Language Arts teacher in your local school. Ask their opinion. I don't expect the Queen's English (or the President's or whomever) , but the essence is to be able to communicate clearly.

PlainBill

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

The fact that I got the seven volts on the control wire for the backlights,and that it goes away when the TV turns off eliminates the backlights,inverter,and the power supply as the problem?So it's the mainboard turning the TV off,and not the power supply?
I did notice one heatsink on the power supply getting alot hotter,and sooner then the rest of them.Are the voltage regulators that you are talking about the ones that look like transistors with three legs bolted to the heatsinks?I also have a heatsink on the mainboard as well.
While I was waiting for someone to write back before the last post,I took the inverter out,and looked over the coils a little closer.There were two that looked like the tape around them was white.I thought they were bad,but they tested fine from what I could tell.
After I put the inverter back in,I took the heatsink plates off the power supply,and looked at it a little closer,but didn't find anything different,so I put it back together.
When I went to test the TV out,it stayed on longer then it ever has.A little over a couple of minutes before it turned off by itself with no sound,or picture,and the standby light off.I thought maybe it turned on so long because I might have put pressure on the coil terminals testing them,and it turned off because the cable TV wasn't hooked up?After that,I turned it back on again,and it stayed on until I turned it off a minute,or two later.Next,after I put the back on,and hooked it to the cable,it stayed for what I'm guessing a half hour,then it turned off while I had it on mute.Thinking the mute had something to do with it,I left the sound on with the one speaker I had hooked up,but it still turned off whenever it felt like it.Usually around a minute,or two.For awhile I could turn it off,and back on when it turned off by itself,but it got to the point where I would have to unplug it,and plug it back in to get the standby light to light red so I could turn it on again.Now it's back to staying on only a few minutes at a time.
I would say that it might be overheating?Either that,or the coils need to be resoldered again,because they are heating up,and separating?Does the metal cage around the inverter act as a heatsink?All this time I have had it off.I also took the paste off the heatsink plates when I first started having trouble,so they are metal to metal.Before that,I had Arctic Silver on them when it started turning off by itself.
As far as the missing wires,there were four of them in one plug on the mainboard,but someone cut the two ground wires off.The other two are the backlight on/off,and the brightness.Would a bad ground cause the problems I'm having?
Just for kicks,I took my ESR meter,and tested the capacitors that I removed from the power supply.I found one that had the top bulged out,that tested fine.Which got me thinking,if I can have a capacitor that looks bad,and measure fine,what are the odds of having a capacitor that looks good,measures good,and still be bad?How reliable are the ESR meter readings?Especially in circuit.Also,can they measure the aluminum surface mount capacitors?The ones with the black plastic base.Thank You very much!

Tyler

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

I also noticed a buzzing noise coming from power supply board.Is this normal?Thank You very much!
Tyler

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

How important is it to have low ESR capacitors in the power supply of a LCD TV instead of the general purpose ones?Do the capacitors just last longer,or do the power supplies have to have them in order for them to work right,or at all?Could that be why my TV turns off after it has been on for only a few minutes?The brands I used to replace the bad ones were the following brands.Hitano,Jamicon,Nichicon, United Chemi-Con,Rubycon,and Panasonic.They were all 105C. Could the ones I used have been all dried up?Bad to start with?Been on the shelf too long?What is ripple current?It did seem like the more capacitors I replaced,the longer the TV would stay on,until it got hot,and then it wouldn't stay on as long.Some of the capacitors that I replaced looked,and measured good ESR.What are the odds of having a capacitor that looks good,measures good ESR,and still be bad?How reliable are the ESR meter readings?Especially in circuit.Also,can ESR meters measure the aluminum surface mount capacitors?The ones with the black plastic base.Sorry for all of the questions.Thank You very much!

Tyler

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

How important is it to have low ESR capacitors in the power supply of a LCD TV instead of the general purpose ones?Do the capacitors just last longer,or do the power supplies have to have them in order for them to work right,or at all?Could that be why my TV turns off after it has been on for only a few minutes?The brands I used to replace the bad ones were the following brands.Hitano,Jamicon,Nichicon, United Chemi-Con,Rubycon,and Panasonic.They were all 105C. Could the ones I used have been all dried up?Bad to start with?Been on the shelf too long?What is ripple current?It did seem like the more capacitors I replaced,the longer the TV would stay on,until it got hot,and then it wouldn't stay on as long.Some of the capacitors that I replaced looked,and measured good ESR.What are the odds of having a capacitor that looks good,measures good ESR,and still be bad?How reliable are the ESR meter readings?Especially in circuit.Also,can ESR meters measure the aluminum surface mount capacitors?The ones with the black plastic base.Sorry for all of the questions.Thank You very much!

Tyler

Very important. The SMPS puts out about 100,000 pulses per second. General purpose caps are rated for 120 pulses per second. A low ESR cap will absorb those pulses without allowing them to reach the rest of the TV.

I'm going to use a very rough analogy. Imagine a door attached to a very substantial wall. That door gets opened and closed hundreds of times a day. The vibrations are absorbed by the door frame and the solid wall. Now imagine the wall is much lighter - no bracing, 2 x 3 studs, just a few nails. Every time the door closes the entire wall shakes. The nails holding the sheet rock in place start popping. Nails holding pictures up start working loose. Cracks begin to appear around the door and the windows. One day the door and frame might pull out of the wall because the nails holding it in place have pulled out or the wood has split.

Much the same thing happens when you use GP caps. The inverter isn't getting the stable supply it demands and may shut down. The unstable power supply causes problems on the logic card; the serial prom may become corrupted. The caps will overheat and bloat fairly quickly.

Again, it's not just the brand of cap that's important, it's the series.

PlainBill

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Could that be why my TV turns off after it has been on for only a few minutes?Do you think the capacitors I replaced went bad that quick,or is it beacuse I didn't use low ESR capacitors?Should I replace the capacitors?Are Hitano,and Jamicon any good?I didn't see them on either the good,or the bad list.What is ripple current?

1.What are the odds of having a capacitor that looks good,measures good ESR,and still be bad?
2.How reliable are the ESR meter readings?Especially in circuit.
3.Can ESR meters measure the aluminum surface mount capacitors?The ones with the black plastic base.
4.If a capacitor measures good ESR,does that also mean the capacitance is alright?

Thank You very much!
Tyler

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Could that be why my TV turns off after it has been on for only a few minutes?Do you think the capacitors I replaced went bad that quick,or is it beacuse I didn't use low ESR capacitors?Should I replace the capacitors?Are Hitano,and Jamicon any good?I didn't see them on either the good,or the bad list.What is ripple current?

1.What are the odds of having a capacitor that looks good,measures good ESR,and still be bad?
2.How reliable are the ESR meter readings?Especially in circuit.
3.Can ESR meters measure the aluminum surface mount capacitors?The ones with the black plastic base.
4.If a capacitor measures good ESR,does that also mean the capacitance is alright?

Thank You very much!
Tyler

Again, it's more than the brand. Lelon RXA low ESR caps are notorious for quickly failing in monitor power supplies. Panasonic FM low ESR caps are known to last a very long time. Replacing all the caps in a monitor power supply with Panasonic M series (not low ESR) might result in a power supply that will soon fail, or might not work at all. In a large part it depends on how conservatively the power supply was designed, and just how far the caps are from the desired specs.

1. Very low. In theory, it could have a low capacitance, but that's about the only problem.

2. Good enough, provided you account for circuit topology. I've forgotten the exact details, but here is the gist of it. I purchased a TV that had teh symptoms of bad capacitors. Opening it up I found several bad caps, as well as many that looked good. The obviously bad caps had ESR readings several times higher than the specs. I checked the replacements I had on hand. The read at least a factor of 2 below the specs. (Note that the spec is a maximum value). I checked other apparently good caps in the TV and all had readings at least a factor of two below the specs.

Circuit topology is important. Let's say you have three caps with an ESR spec of .60 ohms. The reading is .30. At least one of those caps is bad; the three of them in parallel should have read no higher than .20. HOWEVER, there are two other points. Three good caps in parallel would have read .10 or lower. And the caps are probably not the cause of the problem, but should be replaced as a precaution.

3. Yes. Again, remember circuit topology.

4. No. Electrolytic caps are made by winding two strips of aluminum into a spiral. If for some reason one strip of aluminum fractured 3/4 of the way to the end the capacitance would be low, but the ESR would still be good. This is unlikely to occur.

One thing to remember, engineers tend to do conservative designs. If they calculate 650 uF is the minimum capacitance required for adequate filtering they will spec an 820 or 1000uF capacitor, not a 680 uF.

PlainBill

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

I just replaced two 35V 1000UF capacitors in the power supply with a known good brand(Rubycon YXA) thinking that might be the problem,and now the TV only stays on for a couple of second instead of a few minutes like it did before replacing the two capacitors.Did I solder them in wrong,or are the better capacitors making the real problem show up sooner?When you solder these boards,is the solder supose to go through the board to the other side?
I measured the voltage on the wire that turns the backlights on,and I get around 4.8 VDC when the backlights are on,and none when the TV turns off by itself.Does this mean the backlights,and inverter are alright,and it is either the mainboard,or power supply turning The TV off?If I still had voltage on the wire that means the inverter,or a bulb is bad?
What would I need for an inverter to test the individual bulbs?I tried to use another monitor,but I guess it wasn't powerful enough as it would turn on for a few seconds,then off again like the TV.Will one of the inverters for the neon computer lights work?I have seen some 12,and 24 volt ones.Thank You very much!
Tyler

The used the following brands,and series capacitors in the power supply.

Rubycon MCZ,Rubycon YXA,Panasonic ED,Hitano EHR,Jamicon TR

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Now the TV is back to working for ten minutes,or so.After it heats up it is down to around a minute,or less.Sometimes I have to unplug it to get the standby light to come back on.
The strange thing is,I went to undo a zip tie that hold the speaker wire to the mainboard so I could unplug the connector. Thinking I tried unplugging the keypad,and standby light/IR sensor before,but never the speaker connector,I unplugged it,and that is what got the TV back to working the way it was before I changed the two capacitors.
The real kicker is,I plugged the speaker connector back into the mainboard,and the TV still stayed on.I did notice that the mainboard flexes quite a bit in the area of the speaker connector.It is on a corner,with no real support.I also have all the paste removed from the plates that go over the heatsinks which probably doesn't help much.How does the white paste conduct the heat between the metal plated?It looks like it would hold the heat in more then anything.Wouldn't it be better to use Arctic Silver?
I just can't understand how unplugging,and plugging the speaker connector on the mainboard helped the TV stay on longer,unless a component on the mainboard by the speaker connector was making a bad connection,and when I moved the connector it completed the connection so the TV worked until it heated up enough to separate?Thank You very much!
Tyler

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

I let the TV cool off unplugged for around an hour,and it still turns off after about a minute,or so.Even in the other TV modes.It could be a grounding issue.If I remember right,when I had the speaker connector unplugged from the mainboard,and you had it on the TV mode,you could touch the center of the connector where the cable TV goes,and nothing would happen.With the speaker connector plugged into the mainboard,if you touch the end of the cable TV connector,the snowy picture goes crazy.The TV connector was bent when I got the TV.The person that I bought it from straightened it out by hand.It is still bent,but the picture doesn't jump at all when you move the cable TV wire,and the picture is perfect.
There were two ground wires that went from the mainboard where the backlight on,and brightness wires are to the inverter that someone cut off.It got me thinking why they were cut off,but then it also go me thinking why they were there to begin with.The inverter is touching the frame of the TV in several spots,as well as being screwed to metal mounts.Maybe the inverter needs to have more then a few grounds to deal with static electricity that it generates?I also noticed a buzzing noise from the power supply.Thank You very much!

Tyler

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

I noticed that when the TV is on the tuner mode without the cable TV hooked up,the snow on the screen sometimes flickers.It also happens on the AV mode,but not as often.
The TV had low ESR KT brand to start with that went bad,so I replaced them with the following brands,and series.Rubycon MCZ,Rubycon YXA,Panasonic ED,Hitano EHR,Jamicon TR.What I wanted to know was if these were low ESR capacitors,and if I really needed low ESR capacitors for the power supply to work right/at all,or just to make it last longer?Thank You very much!
Tyler

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

I noticed that when the TV is on the tuner mode without the cable TV hooked up,the snow on the screen sometimes flickers.It also happens on the AV mode,but not as often.
The TV had low ESR KT brand to start with that went bad,so I replaced them with the following brands,and series. Rubycon MCZ, Rubycon YXA,Panasonic ED,Hitano EHR,Jamicon TR.What I wanted to know was if these were low ESR capacitors,and if I really needed low ESR capacitors for the power supply to work right/at all,or just to make it last longer?Thank You very much!
Tyler

Yes, the power supply needs low ESR caps to work properly. As the ESR rises the noise on the power supply lines increases.

Rubycon MCZ is low ESR; Rubicon XYA and Panasonic ED are not. I don't know about the other two.

PlainBill

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

So all this time,it could have been because I had the wrong kind of capacitors in the power supply?I thought that the low ESR capacitors would have just made it last longer,not prevent it from working right,or at all.Where do get low ESR capacitors?Especially the 450V 150UF Panasonic TS-ED one,as it needs to be 25MM tall,and 35MM around.Everyplace I looked,all they mention is an ESR number,and ripple current rating.Pick the lowest ESR number?
The fact that the voltage on the signal wire for the backlights goes away when the TV turns off by itself rules out the inverter,and backlights?If you have a bad backlight,the inverter turns them off,If the inverter is bad,the same thing?When mine turns off,I don't have a picture,or sound.So the mainboard is turning everything off?Thank You very much!

Tyler

[PlainBill]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

So all this time,it could have been because I had the wrong kind of capacitors in the power supply?I thought that the low ESR capacitors would have just made it last longer,not prevent it from working right,or at all.Where do get low ESR capacitors?Especially the 450V 150UF Panasonic TS-ED one,as it needs to be 25MM tall,and 35MM around.Everyplace I looked,all they mention is an ESR number,and ripple current rating.Pick the lowest ESR number?
The fact that the voltage on the signal wire for the backlights goes away when the TV turns off by itself rules out the inverter,and backlights?If you have a bad backlight,the inverter turns them off,If the inverter is bad,the same thing?When mine turns off,I don't have a picture,or sound.So the mainboard is turning everything off?Thank You very much!

Tyler

If you look at my first post in this thread you will see several links in the signature. Those take you to several threads in the FAQ that may help you.

As far as where to buy the caps, how would I know? At least one of the 'Information for Newbies - Read before posting' threads tells you to edit your profile to include your location. I can't suggest a source without that information.

PlainBill

[PCBONEZ]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

70JUDGE, the style you write in is really hard to follow and understand what you are saying/asking.

Break

It

Up

A little

Please.

The 450V 150UF Panasonic.
1 - Doesn't need to be low ESR. It is on the AC side.
2 - Is a good brand. Shouldn't need replaced.

If the application calls for a low ESR cap then a GP cap might make it not work at all.

The proper way to find a replacement cap is to look up the ESR and Ripple for the old cap and then find a replacement that is as good or better.

If you can't find the data for the original cap then fail safe by getting caps with specs at least as good as the best caps commonly used in that application.
That's where you need experience to call upon or to ask an old fart what should be used there.

-

A cap's ESR is basically it's 'resistance' to ripple.
Ripple is electronic noise [static].
A filter caps job is to filter ripple [noise] out of the circuit by sending it to ground.
A cap with too high of an ESR will leave noise in the circuit.
IC chips don't work well with excessive noise.

The Ripple rating in data sheets is how much ripple they can pass without overheating.
A cap with too small a Ripple rating will overheat and probably fail.

The strip down the side is the negative side of the cap.
Don't put them in backwards, that is sure to kill them fast.

Not common but occasionally you may see a Bipolar cap.
They usually are marked with a BP and don't have the stripe.
Those can go in either way.

.

[70JUDGE]

Re: Trutech PLV16260 LCD TV Turns On For A Few Seconds Then Turns Off

Believe it or not,now the TV is back to the way it was when I got it.When the TV got to the point of only staying on for a second,or two after replacing more capacitors thinking that was the problem,I decided to replace the main 450V 150UF capacitor again.Now the standby light will come on when you plug the TV in,and the light goes out when you press the power button,but nothing else happens.I even tried changing the 400V 10UF capacitor above it again as well.
I did notice a buzzing noise coming from the power supply when I pressed the power button.I traced it to a film capacitor marked 400V 105K.Is there any way of testing this?I'm guessing this was the buzzing noise I heard when the TV was still working,so maybe this isn't the problem.
Why I changed the capacitors was because it seemed like the faster I turned the TV back on when it turned off by itself,the longer it would stay on.Thank You very much!
Tyler