Two LG TVs having issues. 50pc5d and 42pt350.

[Lavitz]

I'm not really sure where to start on the 50pc5d. The TV in its current state shows no power is being received at all. When plugged in and the power button is pressed there is no feedback in any way. It was a TV used for karaoke in a bar so there is also no telling how much damage there is from smoke either.

The second TV just went out today. From the research I have already done it sounds as if there is either a power supply issue or an issue with the y sus or z sus. The current status on this TV is that it clicks on, makes a buzzing sound, and the light turns on for a moment before fading out. After that happens it repeats the buzzing and goes back into standby.

I am going to try to get pictures soon, but would like an idea as to where I should start with the larger tv.

[heavymachines]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Check fuses, is first.

[dskall]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Good pictures of boards, back of tv with cover off. Voltages present on connector from powerboard to mainboard

[ReeceyBurger123]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

You need to do some research on how to test them and provide us with voltage information etc first. PC1D prolly bad caps on psu, 42PT350 prolly cold solder joint on Zsus and Ysus erc coils resolder both.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Alright sorry for the slow reply guys. Our multimeter was"misplaced" as I was told so I had to go out and get a new one today. One of the two fuses I found on the power supply seems to be blown. The caps all look fine from what I can tell. I have been trying to check find anything burnt out as well but with how bad it looks from being in the bar it is hard to tell. So I will try replacing this fuse then I will getry back to you guys on the 50pc5d. I will also add a photo of the ps board when I get the picture onto a computer.

[dskall]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Need good clear sraight on pitures of back of tv with cover off and each board.

[freakaftr8]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

The 50 is known to eat primary supply mosfets and blow the fuse. How do the solder contacts look on the back of the power board

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

The solders look fine but I can get a picture of that as well so someone with a more trained eye can take a look at it.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Alright here is my photoset covering all of the boards getting as good of pictures as I can with what is at my disposal. I can attempt to retake some of the pictures if needed.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Ok I have pictures of the 42pt350 transferring now. I will upload them when I get a chance. So far I have tested the power supply with the zsus unplugged from it and it would click just like normal. When I plugged the zsus back up to it, and unplugged the y sus from the zsus I got the same result as I normally got before opening the back as the all.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Alright, last of my spammy multiposting. Pictures of the 42pt350. Sorry about posting so many times in a row.

[ReeceyBurger123]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

So that helps but not alot at all, remove Zsus on 42" and see if it has cold solder joints.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Board removed, I don't really see anything that looks cracked in the soldering. Some of it looks a bit bubbly around the edges but it still seems like the solders should be fine.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Very much the same with the y sus. The only ones that stand out as potentially cold joints are the solders for the heatsinks

[ReeceyBurger123]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Ok have you a picture please ? On your PT350 the Ysus has all the ERC parts and coils so Id check there.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Here are two pictures for a bit better clarity since it is a relatively big board.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Welp, I feel kind of blind for not seeing it before, but I decided to try checking the vs and va on the TV as per suggested in an alternate thread. When I plugged my tv in I heard a very light buzzing that I apparently just didn't pick up on previously. I didn't get a chance to see what the voltages were since I came straight here after seeing the resistors at the top look burned. I checked the picture I posted and sure enough the board is blackened in the picture too. I just apparently straight up missed it. So does that mean something on the power supply is shorted out?

[heavymachines]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Hard to tell dark image but this damaged? marked in pic.

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Sorry about how dark some of the pictures have been. My lighting kind of sucks. I just took some of the bottom of the power supply and of the area you were questioning. I don't see any damage in the area you pointed out, the only damage I have found myself have been on the power supply. I will upload those pictures when I get them transferred

[Lavitz]

Re: Two LG TVs having issues. 50pc5d and 42pt350.

Alright pictures of the bottom of the power supply and the section you asked about.