LG 42" Plasma 42pc3d

[klatj]

Hello,
I must say that I have limited (if any) knowledge of electronics. I recently tried to turn on our plasma and noticed that the tv would begin to light up (or prime as I have read) and then shut off. I tried several times but got the same results. I checked for local repair shops and found one with outstanding reviews. I took the TV and paid a diagnostic fee. I was told that the TV has a bad power supply. Since the repair facility wanted $375 to repair it ($200 for the power supply board and $175 for labor) I declined and picked it up. It is now great wall art since our home is currently on the market.

I began searching for replacement power supply boards and noticed that I could easily purchase one for $65. My question is how difficult is this part to replace. As I stated early on in my post, I have very limited electronics knowledge. I am quite the do it yourselfer when it comes to any other projects. Since the tv is useless as it sits, what are the chances that I could replace this part myself? Please use specifics on the install. Thanks so much!

Khris

[PlainBill]

Re: LG 42" Plasma 42pc3d

Hello,
I must say that I have limited (if any) knowledge of electronics. I recently tried to turn on our plasma and noticed that the tv would begin to light up (or prime as I have read) and then shut off. I tried several times but got the same results. I checked for local repair shops and found one with outstanding reviews. I took the TV and paid a diagnostic fee. I was told that the TV has a bad power supply. Since the repair facility wanted $375 to repair it ($200 for the power supply board and $175 for labor) I declined and picked it up. It is now great wall art since our home is currently on the market.

I began searching for replacement power supply boards and noticed that I could easily purchase one for $65. My question is how difficult is this part to replace. As I stated early on in my post, I have very limited electronics knowledge. I am quite the do it yourselfer when it comes to any other projects. Since the tv is useless as it sits, what are the chances that I could replace this part myself? Please use specifics on the install. Thanks so much!

Khris

I'll start with the good news. If you have a DMM, a Philips screwdriver, a small standard screwdriver, and an able-bodied assistant you can make the swap yourself. Once the new power supply is installed you will have several adjustments to make. I'd estimate the entire job should take under an hour for a professional. The service manual for this TV is available at elektrotanya.

Now the bad news. Based on experience, there is a good chance that is not a power supply problem. That TV is notorious for failures of the hybrid in the Y-sustain and Z-sustain modules. The symptoms described match a shorted hybrid. I would suggest downloading the service manual, reading it, then deciding if you want to tackle the diagnostic steps yourself BEFORE ordering a power supply.

In either case, be aware there are voltage differences of up to 400 volts inside the TV. Fail to use common sense and you won't have to worry about fixing the TV.

PlainBill

[klatj]

Re: LG 42" Plasma 42pc3d

Thanks for your reply. I read numerous posts on this exact tv and everyone has the same opinion as you. The repair guy said he tested the y-board and it was not the problem. I wonder if he was being honest

[PlainBill]

Re: LG 42" Plasma 42pc3d

Thanks for your reply. I read numerous posts on this exact tv and everyone has the same opinion as you. The repair guy said he tested the y-board and it was not the problem. I wonder if he was being honest

He may have been. The Z-sustain could also do it. IIRC, there is a section on troubleshooting in the training manual. It goes something like this: Unplug TV, wait 5 minutes. Disconnect power cable from Y-Sus. Plug in TV and turn on. If it turns off by itself, the Y-Sus is not the problem. Unplug TV, wait 5 minutes, reconnect the power cable to the Y-Sus, disconnect the power cable from the Z-sus. Plug in TV and turn on. If it turns off by itself, it's not the Z-sus. Unplug TV. Wait 5 minutes, reconnect power cable to the Z-sus. Disconnect power cable to the X-card. Plug in TV and turn on. If it turns off by itself, replace the power supply.

PlainBill