Proscan 40LD45Q 40" LCD TV Help Needed!

[70JUDGE]

I have a Proscan 40LD45Q 40" LCD TV that turns on for a couple of seconds a with snow picture on cable(Cable not hooked up to it),then the left 1/4 of the screen goes darker then the rest of the screen,then the TV turns off.
I thought maybe a bad bulb,or inverter,but from what I can tell from the back,the bulbs run left to right,and not up,and down.
Also,there is a cable with a connector like the one on the end of the backlights that goes from the power supply to the inverter.I went to unplug this,as well as the inverter signal cable to test for voltages on the power supply thinking the backlight,and or inverter was causing the TV to turn off,and before I knew it,a fireball shot off from where the cable(The one from the power pupply to the inverter that looks like the backlight power wires) got too close to the socket,and grounded out.
So now I'm wondering if I leave this cable off in the future (Out of the way!)the same thing might happen,but on the underside of the board where the connector goes through the board,and the backlight terminals are so close to the pins that hold the socket to the board.Kind of like a spark plug jumping the gap.
I have unplugged inverters before to test a power supply that was being pulled down by a shorted inverter,but this is the first one I have seen with a power supply powering a inverter like that.I wonder if a regular LCD monitor would short like that if I unplugged both backlights?Any help is greatly appreciated.Thank You very much!

Tyler

[sgt18]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Did you ever find the solution? I have a 40LD45Q with extactly the same problem.

Thanks!!!!

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I am still in the process of repairing it.I thought maybe someone on here could help,or had the same TV with the same problem,as I have seen many online with the same problem,but maybe my "fireball incident" scared all the help away!HA! HA!I see there is even one on Ebay right now with the same exact problem,that is why I am thinking there is a "known" problem with these TVs,kinda like the capacitor problem.Once we figure out what it is,it should help everyone out.
I have bought a few inverters,and had the TV going for a couple of days,but then it was back to doing the same thing again.Maybe I got bad parts?Known part to go bad?Part on it's last hours?The original inverter was burn on the backside.Is yours?I thought a new inverter would solve the problem,but before I noticed it was bad,I had the "fireball incident".I'm thinking that might have "weakened" the power supply,and,or shorted it out,as one of the replacement inverters,the one that had the TV running,now has a burn spot in the same spot on the back of it as well,just not as bad.The burn spot is the from the 9100 surface mount resistors right above the single coil on the right side of the inverter
Right now,I am waiting for a power supply to show up.I am hoping that will fix it.I will let you know if this makes any difference.I am going to try the "new" used power supply with the two inverters I have left that don't have the burn marks on them.If the old power supply has some kind of short,I don't understand why it didn't burn out all the inverters that I tried,unless the short is a weak one,and it takes time for it to do damage.
Another thing was when I had the inverter in that did have the TV working for a couple of days,I had to "jump start" the TV by unplugging,and repluging it several times to get it to stay on.It didn't work out of the box.I can't imagine that I got three bad inverters.Then again,maybe I did.If the power supply works out of the box with both the "good" inverters that I have left,then the power supply was the problem.If not,then either I got a bad power supply,bad inverters,or both.Thank You very much!

Tyler

[sgt18]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I did not disconnect the inverter board becasue of your fireball story I checked all the transformers for open / short and they seemed good, I had one that was nosiy so I lifted it off the invertor board and it did the same thing so I am suspecting the power supply board. Where did you find the power supply board? I did not find any signs of burning.

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Mine turned out to be the power supply along with the inverter,as it had a burn spot on the back.
Before I tried the new power supply,I put the original power supply in,along with a "good" inverter(one with no burn marks),and the TV would turn on,and then off like it had been doing.I did this,as I had the panel apart looking at the bulbs,and wanted to know if anything changed since then.Next I left the inverter in,and put the "new" power supply in place of the original,and the TV works perfect.No "jump start" needed.
I would really like to know what was wrong with the original power supply,and if the "fireball" incident never happened,would I have just had to change the inverter.Maybe that is what caused the burn mark on the inverter?Something had to have been wrong with the TV to start with when I picked it up,as it was turning off from day one.What "damage" I caused from the "fireball" incident besides the burned connectors,I will never know.
I just don't understand how it worked those couple of days.The fact that I had to "jump start" the TV leads me to believe bad capacitors.The brand in both of the power supplies are Capxon.
As far as finding a power supply,I lucked out,and found one on Ebay.I see Sears Parts Direct stocks them,but right now they are Back Ordered.For how long,who knows.
What are the part numbers on your power supply?There is a part number on a white sticker on one of the heatsinks,and one on the board itself with a checkmark beside it.Depending on your part numbers,you are either going to find lots of them,or if you have the same part numbers as mine,out of stock,and back ordered everywhere you look.I hope this helps.Thank You very much!

Tyler

[sgt18]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Any ideas on using the other version of the power supply I have the RE46AY2502which is back ordered but the RE46AY2501 seems to be avalible. All the other board part numbers seem the same so I was thinking it should work.

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Does your power supply also say AYL400203 with a check mark beside it?I see they are different prices,so I would have to say they are different,and for some reason.What that is,I don't know.If you want to take a chance,that is up to you.Maybe they will take it back if it doesn't work for you.Thank You very much!

Tyler

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

How did you make out?Please let us know.Thank You very much!

Tyler

[bpauly23]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I have the Proscan 40LD45Q. My TV will turn on and work fine for about a minute, then the screen will go off. Power light stays on and the sound still works. I replaced the inverter card and get the same symptoms.
My power supply is AYL400203. Everywhere I look is out of stock of this power supply, so I would like to do a cap kit on it.
Any tips as to what might be going on, or any leads to a power supply vendor who has them would be most appreciated.
Thank you!

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

There is one on Ebay right now.It was listed not too long ago.It is Item #250877400500.Thank You very much!
Tyler

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I also see that Sears Parts Direct has both of them back in stock as well for $42.86 plus shipping.They go by the part number on the white sticker that is on the heatsink.I hope this helps.Thank You very much!
Tyler

[TrueReb]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I have a 40ld45q that has a broken lcd panel that I am scrapping. Shoot me your best offer for parts that you need. I know the power supply and inverter boards are good, as I do get a picture on the broken screen still. Best way to contact me is email at ernie@computeremporium.net as I don't frequent this forum much.

[mca]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I know this is an old thread, but I will provide some information. I too bought a Proscan 40" model number 40LD45Q and let me tell you, these are the worst LCD's you can ever buy, they are nice, but they do not have the reliability that you need in an LCD TV. Now my TV is on mostly 10 hours per day, and these TV's can't withstand that type of abuse due to the quality of the components (capacitors) used inside.

I was having the same symptom, my tv would just shut off. I would then go in the other room look at it and shake my head. So I would push the on button again. It would turn on show the picture for a brief second then the screen would black out from left to right and go back into stand by. At first I thought it was the tactical switches on the side of the TV, I send out my power supply for repair, guy sends it back says there's nothing wrong with it, and never replaced any caps, couldn't test the board in his lab so therefore I ruled that the repair person didn't do his job or test anything. I wasn't charged for the shipping or ESR cap testing. He claimed the major caps tested ok but like I said, didn't have a tv to test it in (BS).

I thought it was the side switches because I always turned the tv on from the side of the tv walking buy it. So then I started using remote, seemed to work. Then went out on me again. Was not the switches. I had previously bought a new inverter slave board, (long boad side of tv) pcb and also bought a new main board (controller/driver) pcb and swapped those out and still got the problem which told me if was for sure the power supply (pcb in middle of tv).

Proscan sends me a new power supply finally, board is white instead of yellow like you see in the below pic (showing original PSU), waited 4 weeks for it. I pop in their new power supply and it works for 3-4 weeks, then just last night, again it dies out on me. So this is an overheating problem and possibly an issue with crappy capacitors. I notice they didn't use the best of caps, so I decided to go ahead and order the cap kit and repair this thing once and for all. The guy I ordered the caps from says that the caps, even though they are rated for 105' C, they used crappy capacitors instead of using the high quality Nichicon rated for high temp caps. He also told me that he has developed a 12v fan mod for this power supply but he recommends replacing the caps first.

Ok, so the cap kit is ordered from a guy named Joe Leller out of Brooklyn NY, he is on ebay and provided me this cap kit with all high quality capacitors, I put them in and wouldn't you know!!!! No more overheating problems and my TV hasn't died out again yet.

If your having this issue with your 40" Proscan LCD 40LD45Q, I would recommend contacting Joe at his email to order a cap kit from him for this tv, he ships worldwide also: joeleller2(at)gmail.com - he emailed me back and I was able to pay using paypal.

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

I tested my original power supply with an ESR meter,and all of the capacitors tested good.The only thing I can think of is some of the capacitors are in parallel,and it is reading the lowest reading making it look like they are all good.Maybe this is what happened when your power supply was tested.Mine might have had a problem with something other then the capacitors,or both.Replacing the power supply fixed the problem.I also replaced the inverter,as it had some burnt surface mount resistors on it.I hope this helps.Thank You very much!
Tyler

[mca]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

OK this is an update, my tv died out again 20 secs after putting in the new caps.. So the issue with this power supply isn't the caps unless you know for sure they have blown and you can verify this. The only cap I didn't change out was the large filter capacitor shown on the top left of the photo between the two large heat sinks, it says "HOT" on it which I think means horizontal output transistor. I'm thinking about changing this out.

As for the inverter board and main cpu board those boards like I said were changed, and they are not the problem. It's something on this PSU or the lamps themselves inside the panel.

Can anyone give me an idea, I would really like to figure this tv out.

[70JUDGE]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Twenty seconds?!How long did you test the TV before you posted about changing the capacitors?

Are there any burn marks on the back of the inverter?Mine was burnt just above the single coil on the right side of the inverter.I think maybe your old power supply burned out your new inverter.

The HOT is the HOT side of the board.If you look at the right,there is the COLD side of the board.On the back there is a white line that divides the sections.

I hope this helps.Thank You very much!
Tyler

[maciakt]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Hey Guys thanks for the info on this tv its good to know other people are having similar problems. I also have the 40LD45Q 40" Proscan 1080P that I bought at the end of July, 2010.

Let me tell you about my "EXPERIENCES" with this tv. In *GENERAL* it has been a good tv. Mine worked flawlessly up until about June of 2011 (so about 10-11 months) and then one day I turned the tv on and it shut off on its own. I thought maybe I had accidentally double pushed the power button on the remote so I turned it back on again. Same thing turn on turn off real quick. So I waited an hour or two and turned it back on again, same usual problem. What I ended up doing is unplugging every single damn thing connected to my tv except for the power supply cord. I turned the tv back on and voila it worked (I saw the blue screen!). So then I proceeded to plug my antenna back in and was able to watch tv or use console again. I was actually breathing a sigh of relief because I thought I would have to send it in for warranty repair since I only had a few weeks left of warranty. But the fix was simple.

Now jump forward from June 2011 to Sep 2011. During this time my tv mostly worked again except once in awhile it had the same issue. Well I did the same thing again, unhooked every single cable into the tv except the power and I could turn the tv on again. The only difference this time is I noticed it always happened on a certain tv channel 41-1 digital OTA HD 1080i (I would watch ABC Jimmy Kimmel at night and would turn tv again the next day and it would flick off real quick). So I would now unplug everything, turn it on, blue screen, then turn the tv channel to INPUT from 41-1 digital OTA HD channel so that when I plugged antenna back in it wouldn't turn off. Now once I plugged antenna back in, I could turn the channel from input to 8-1 (NBC) and watch tv and then later turn to 41-1 and no problems!

Well I had been doing this routine maybe once a week or every other week from June to just today. Tonight I didn't have the tv on since 2pm and I turn it on around 8pm and it does the on off real quick thing. I also noticed this time that when I unplugged everything that the LEFT side of the screen was darker than the right side as people have mentioned in forums. Also this time my unplug all cables trick was no longer working. Boo So I was trying again after an hour, still same problem. Then I saw a post that someone said the wattage should be 230 watts for this model (which I kind of remember was false as I thought this tv had similar wattage than my previous model which was only 30" phillips and I thought cool for not very much more watts (like 10) I get 10 extra inches!).

So scratching my head here, I find my Kill-A-Watt meter and try to plug that in to my power strip. But it doesn't fit. So I plug Kill-A-Watt directly into wall, with a reporting of 59.9hz and 0watts with the tv plugged in but not on (this is good because its not vampire drawing watts when off). So I proceed to plug my tv directly into the KILL-A-WATT which is directly plugged in wall, flip tv on to see watts reported about 180 and VOILA my tv stays on. I am not going to chance it turning my tv off again tonight until I am done, but maybe the source of my very random problem is the "POWER STRIP" between wall plug and tv plug and not the tv itself? Could this be your problem too? I don't know but I literally was losing hope after turning it on and seeing it turn off right away over the past 4 hours which my tv never did up until today.

While I am not crazy technical and would be slightly freaked out about modding my tv on my own after reading about the fireball I am pleased to report at least for tonight I didn't have to remove one screw to my tv. Will this problem happen again? Maybe? Was it a quick fix that you can quickly check to see if it will help you out? yep! Just thought I would pass on my experiences. I can post back later if I have more problems. If you don't hear from me then assume thats good news that my tv hasn't shut off anytime soon.

Thanks and I would love to hear from others to see if this solved their problem too.

PS- my power strip is old, like 10 years old, did it get hit by a power surge? maybe? I dont know but that might be why the tv turns on/off. Or maybe I just got extremely lucky for one more day and this problem will surface again lol

TJ

[maciakt]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Well an update to this post.... this morning I turned my tv on and it was turning off again. I did this about 4-5 times over a 2-3 min period same result. I then vacuumed my living room and tried it again and now the tv is on. Not as bad as yesterday but still frustrating that its doing this now for the first time 2 days in a row.

One thing to note about my tv, once its on for more than a few seconds, it has never turned off on its own. And this activity happens from a cold start (its not even hot where I live now) so its definitely not some over-heating issue.

TJ

[cashkennedy]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

From what i understand about overheating, overheating wears out capacitors over a long period of time causing them to no longer function as originally intended. When the capacitors are physically hot they run fine , its that they are damaged in the inside quicker by high heat over the whole life of the product. So infact sometimes when testing for bad caps people heat up the board with a heat gun, because that will make the caps work for a short period.

The fan mod the person refered to would keep the caps cool over the many years you would use the product, preventing them from wearing out as fast. Cheap capacitors usually will last 2000 hours at their max temperature which is a very short time (less then a year if used for 10 hours a day), but if you run them at cooler temperatures they will last much longer.

My guess would be that maciakt's problems are either on the main board / or power board. If your problem is really channel dependent, that could be by chance because of what time you watched that channel, or because of a difference in the channel like sound, that strains the main board preventing it from operating? I think with electronics most repair people would assume your channel stuff is random, because it is very easy to find paterns that dont really exist... I banged on the top of a old crt tv for months because i thought it was causing it to work, when all along it had bad capacitors, so i was probably just imagining it fixing the problem. But I am not experienced enough to trust by any means on this.

[maciakt]

Re: Proscan 40LD45Q 40" LCD TV Help Needed!

Well that could be possible and does make sense (about the over heating). I would estimate that I have the tv on for about 5 hours per day (on average - some days are longer obviously and some days are much shorter). That would put my use at about 1825 (for a year but now I have had this tv for about 425 days which would put me at 2125). So if statistically cheap capacitors tend to die at about 2000 hours then I would say between June and Now I was in that range.

Interesting to note tonight when I turned my tv on, did the same thing (on then off) but as soon as I unplugged the antenna cable again and turned it back on it was staying on. I then switched to input/component, plug the antenna back again and tv works. This time it was not related to any of the specific channels I had mentioned so I think that you are right in saying it was a "chance/random" occurrence that seemed to be a pattern (most likely because I always watch Jimmy Kimmel last at night then shut it off).

So I still wonder though people have talked about replacing all of the caps with high grade ones and it still shows the same result after a short amount of time. Would be interesting to hear from someone who has had long term luck fixing this problem. I guess for now I have to continue to do my little trick to get it to start when it wants to be finnicky and start saving money for a rainy day fund to buy a new tv since I am now effectively out of the warranty period.