LG 50pcdr1 is broke

[nimust]

ok, I am not a TV repair person, but my LG screen went black with no popping sound, the audio kept working for about two minutes then it stopped and then nothing. Thought is blew the caps I took the back off and sure enough two caps on the power board were popped. Changed them out and still nothing, set clicks then powers back off, then I said the heck with it and ordered a new board, waited a week installed it and nothing changed, decided what the heck and ordered a new y sus board and y buffer boards just installed them and still the set clicks and goes into standby. I need help, I do not know what to check next or am I just wasting time and money on the TV.

[dkneyle]

Re: LG 50pcdr1 is broke

Not sure how close your chassis is to an LG 50" plasma that I recently got going, but I wonder if the Z-Sus is the issue? Does it get its power supply by piggy-backing through the Y-Sus board? If the Z-Sus board is the same as mine, I changed out the Y-Sus board, but was also alerted to two SMT resistors (R90 and R901) in the bottom lefthand corner of the Z-sus board that go open circuit. See what you can see on that Z-Sus board.
Anyway, if you do have the piggyback supply to the Z-Sus just pull that and see if anything changes at power up.

[nimust]

Re: LG 50pcdr1 is broke

Mine is a 50" and the z sues piggy backs from the y sus. Do you mean unplug the z sus and see if there is a change? If that is the case I have already tried disconnecting the z sus with the same results. Did your fan come on before you changed any of the boards?

[nimust]

Re: LG 50pcdr1 is broke

I have researched and read everything I have been able too and to no avail.

[dkneyle]

Re: LG 50pcdr1 is broke

Yes, on my failed TV, at initial power up the fans came on for about 5 seconds before everything shut completely off again. It does seem strange that at the first instance of your failure that the sound continued for sometime. I too am out of my depth at this point, but I'm sure someone on this forum will be able to guide you through the repair.

[nimust]

Re: LG 50pcdr1 is broke

Thanks

[Terryfictv]

Re: LG 50pcdr1 is broke

Your power supply has more than 2 caps that need replacing !
It is good procedure to replace all 10v caps while you are right there.
There should be six 3300@10 in the secondary.Use high temp / low ESR
16v replacements. Also, replace C202 & C222 for prevent maintenance.
Hope this helps..........

Terry

PS. I am thinking that your replacement PS is no good.....

[nimust]

Re: LG 50pcdr1 is broke

I'm thinking this supposed new PS is bad.

[nimust]

Re: LG 50pcdr1 is broke

Anyone know how to check the power board?

[nimust]

Re: LG 50pcdr1 is broke

This is a picture of the old Ps board that had the bad caps I replaced them and this did not work, then I ordered a board from eBay and I still have the same click of death.

[dkneyle]

Re: LG 50pcdr1 is broke

Have a trawl through this technical forum website and read any threads that refer to LG 50 inch plasmas. The model numbers vary but they all are basically very similar. Even the power supplies are similar in how they work and the voltages they put out. There is a sequence of voltages that fire up and auto checks before giving full volts. I'm not an expert but I do remember reading or seeing that information somewhere her on the site.
By the way, I think there's a typo in your model number in the topic. I think it should be LG 50PC1DR. A search on this model number will throw up quite a few similar cases as yours.
Also Tom has the service manuals for your beast located here: http://www.toms-service-manuals.com/
I reckon this will get you a long way towards solving your issue. You've invested so much so far you may as well see it through.

[nimust]

Re: LG 50pcdr1 is broke

Thanks for the response, I have checked the output voltages and have found readings that vary, I have disconnected the y, the z boards the readings still vary from 50 colts to 134 volts for p805.

[nimust]

Re: LG 50pcdr1 is broke

What I am trying to find out is located in the picture I posted above, if only two of the caps were bad what else could been blown.

[dkneyle]

Re: LG 50pcdr1 is broke

There are any number of things. The MOSFETS that do the inverter switching can fail. Diodes can fail. Use the diode function on your multimeter and look for junction readings that just don't seem right. Because you have many of the same components you can compare. For example, if two leads on a MOSFET read short but the same component elsewhere shows something like a 0.6volt drop then you can probably assume a failed MOSFET. Sometimes they go open circuit as well.

[Jb7444]

Re: LG 50pcdr1 is broke

I have the same tv lG50pc1dra and have the same problem But when I unplug the the p802 harness (on the power supply feeding the board with all the audio video inputs ) the tv starts up but obviously with no picture. I also replaced my power supply only to find I had the same problem. When I plug this harness back in TV shuts right down. So I guess my next move will be to change the board with all the audio Video inputs and coax input outputs Has anyone ever heard of this problem and can someone please tell me the name of this board lol. Good luck

[nimust]

Re: LG 50pcdr1 is broke

with mine no matter which boards I plug in or unplug I get the same click on the two seconds later the second click. Having ordered two power boards and both have not had the proper voltage output. At one point I thought the y sus and buffers were blown and ordered new and that did not work, so now I need to locate a reputable power board and see if that works.

[dkneyle]

Re: LG 50pcdr1 is broke

What's the type number on your power supply? It might be the same as the spare I have here.

[nimust]

Re: LG 50pcdr1 is broke

I have it at home as soon as I can I will post it

[nimust]

Re: LG 50pcdr1 is broke

Board number is 6709900020b.

[dkneyle]

Re: LG 50pcdr1 is broke

No sorry, my spare board is 6709V00001A