Re: LCD Monitor inverter gets way too hot
The money I save on haircuts I use on stupid decisions to try and fix junk.Here are some pics for anyone interested ,of the transformer underside...
CudaDave70
Senior Member
Last Activity: 03-12-2012, 05:14 AM
Joined: 06-18-2008
Location: Pittsburgh Pa.
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Re: LCD Monitor inverter gets way too hot
More good tips for me ,I also really like the link to the Auctiva store ,thanks,I will spend more than ten bucks there. There are other other items I use.
The inverter for 17.99 I had located that store but someone beat me to it ,that is a fair price for that POS.
Everyone else that sells these wants twice as much,I am not going to pay that. I will buy a new universal one for half that first and make it fit.
I would not bother but these little Monitor -TV's are nice and have great video on them. I am going...Leave a comment:
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Re: LCD Monitor inverter gets way too hot
It looks obvious to me that these lamps have very little time being lit,just by the way they look on the ends ,even after a short time you can usually see dark areas around the cathode where it gets hot.Resistor R7 is missing ,who knows if it is supposed to be .
...
Last edited by CudaDave70; 03-09-2009, 08:44 PM.Leave a comment:
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Re: LCD Monitor inverter gets way too hot
Wow ,lots of info, some of course goes right over my bald head. I am starting to believe that the transformer is possibly bad as it started to get pretty hot and started to smell pretty bad.
I did replace the two transistors ,mostly because I had some and I can use the practice on something might end up in the scrap eventually .I had it close to smoking while checking voltage at the transistors, it is around 9.4 volts. There is some numbers on the transformer, looks like 80LL15T-7-H G0611,means absolutely nothing to the untrained...Leave a comment:
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Re: LCD Monitor inverter gets way too hot
OK, lots of feed back and questions to answer,that's good .Not as much worried about fixing this as I am just trying to understand this situation.
First it is a15" LCD TV with a Chunghwa claa150xp screen . A single tube lamp on the top and bottom,they do light and stay lit, the main transformer gets warm but not hot (unusually cool I think).
The toroidal transformer looks OK almost like new and still has a cellophane looking cover on the outside with a part #.
I did not check the voltage at the transistors...Leave a comment:
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Re: LCD Monitor inverter gets way too hot
Good thought ,I did try some othet lamps I had and they are a bit smaller than the correct ones ,same result ,I dunno I never saw this before I may try changing those two transistors ,still cheaper than another board for forty buck and shipping charges.
DaveLeave a comment:
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Re: LCD Monitor inverter gets way too hot
Some pictures of the inverter board that thinks it is a heating element....Leave a comment:
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LCD Monitor inverter gets way too hot
[FONT=Georgia]I realize these ccfl inverters make some heat . But this one you can smell it getting hot and you cannot touch either one of the two transistors underneath (c5706) or the inductor coil on top.
I checked it with an infared
heat gun and it is 250 degrees and climbing . Odd thing is ,it looks like a brand new inverter that someone replaced. I replaced the two aluminum caps just to be sure they were not causing the problem,that didn't help at all.Coul it be that one or both transistors is causing this .
It also looks like brand new light tubes were put in... -
Re: Making use of 16 volt AC adapters
I am pretty sure it is a switching type. It does have a transformer inside though. It is like you would use on a laptop or LCD monitor. Is it a possibility to put 4 diodes in a series in the positive lead and the other 3 on the negative side wire . Would that work that way or am I way off base on that .
The current draw of most monitors is normally rated around 3 amps but I have this one that is rated about 6 amps,it is alot bigger and heavier .I really doubt if it ever demands that much current,maybe when you first light it up. Is this...Leave a comment:
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Re: Making use of 16 volt AC adapters
Well I got alot of different ideas coming in, all are interesting and I thank those who offer suggestions I was able to open it up ,there were 4 screws hidden under the little rubber pads so I was able to look inside . I did locate what appeared to be a pot on the under side I tweaked it and it did nothing with the voltage. It never moved from 16.4 volts. So I am going to try some of the other ideas suggested . I will check back later
Thanks Guys
DaveLeave a comment:
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Re: Making use of 16 volt AC adapters
Hey Guys ,thanks for the info ,I love the idea of being able to adjust the voltage I did not know there was a pot in there for that reason .
Trying to open up one of these can be a disaster like sticking a screwdriver in your hand . I have tried this before ,hurts like hell .Too bad they didn't use a few tamperproof screws instead of that glue .I will try that with one and see if I can do it,maybe they were stingy with the glue on these .
I would like to try to make a small converter that I can plug this 16 volt supply...Leave a comment:
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Making use of 16 volt AC adapters
Hi Gang ,It has been awhile since I been on here to pick someones brain about somthing electronic.
I got a nice buy on some 16 volt 7.5 amp AC to DC power supplies,better know as AC adapters.
As we all know these "bricks" can be used for laptops, LCD panels and LCD TV sets. The thing is alot of them require 12 volt input, and 16 is somewhat on the high side and could overpower and prematurely toast some of the components inside. Some of the Dells and Samsung stuff are even 14 volt input .
I would not be too afraid to use the 16 on... -
Re: Too hard to toss out
Here are some pictures that I just took This all goes away in a few minutes ,now the backlight is starting to shut down also which I can't understand because the voltage is going to the inverter on every wire .
Anybody want to help me save this nice looking TV I am leaning towards recapping the whole board,I have wasted money on worse things....
Last edited by CudaDave70; 10-25-2008, 10:24 AM.Leave a comment:
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Too hard to toss out
I have been messing with an LC-225V2U Sharp LCD TV for a few weeks now (off and on ) without much success. It is just too nice to throw away so I threw some cash into it in the way of a new LCD controller board. I was pretty sure that would fix it because of ehat it is doing. I have no schematic to work from so it is like looking for a TV station with out seeing campaign baloney. Anyway I bought a new board and put it in, improvement but no good. The backlights work and the sound works but the picture is at times a very thin line. I guess my fear is that the LCD panel is bad . The boards have... -
Re: Recap Surface mount capacitor
I also tend to ramble,but it is almost always because I don't know about something ,your ramblings are valuable information and greatly appreciated by me and I'm sure many others that are reading it. I absolutely have more time than money
plus it isn't much satisfaction just replacing boards,Where's the challange ? I never got burnt doing that.
Thanks manLeave a comment:
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Re: Recap Surface mount capacitor
Thanks for that,I am going to go with it ,There were also somemore on this board that said 6 s that is why I said 6volts I just took picture of the 4 s ones.There are about 50 caps on this LCD Control board. Would it be better(SMARTER) to replace all the caps or buy a used and working board for around 60.00 dollars?
DaveLeave a comment:
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Re: Recap Surface mount capacitor
Does anybody know what the 4s. marking is on these capacitors ? Does it indicate 6volts (I would assume). This is an LCD Control board out of a 22 inch Sharp TV . It turns on, has sound ,the backlignts are working ,but the screen is all segmented with all kind of weird designs and colors (mostly grey) .The longer it is on ,the brighter it gets. I am thinking of recapping this before I replace the whole board,but I don't know for sure what this 4s. indicates on the top of some of the smd caps. ...
Leave a comment:
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Re: Recap Surface mount capacitor
Yes it was busted up pretty bad ,It also had a problem with some bad caps and no video when I tried it , that is possibly why it had a big ole fist print in it in the first place . I tried two different screens and it is the same problem on both .
Would a failing transistor produce this kind of interference on the screen? I had one similar to this one ,doing almost exactly the same thing ,I replaced all the capacitors and it was almost gooder than new after that.
The box of junk just keeps growing. I removed the lcd panel from...Leave a comment:
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Re: Recap Surface mount capacitor
I changed them out and it didn't help any ,my guess this LCD screen or screens I tried are not compatible with this Dell .I don't know what else can cause this strange look to the display ,it's now a in the box with the others that don't want revived at least till I can get a LCD panel that is compatible with this E176 FPf. I guess just because the connectors fit together ,don't mean they are compatible with each other.Leave a comment:
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Re: Recap Surface mount capacitor
Hello you mother (board) cappers, Just want to ask this simple question, then I will go away . Are the surface mounted caps suspected to be as much "no good" as the through hole radial electrolylic caps? I replaced a cracked LCD panel on a Dell E176FPf and it has this shakey-snowy look to it like it has some EMI problem .
I replaced all the through hole caps except for these 3 aluminum surface mounted ones that are right near the video output ribbon cable. The interference is not as bad as before I changed all the other caps....Leave a comment:
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