50pc5d LG Plasma

[gdawg]

When I tell my story you will either think I'm crazy or really persistent. I picked up 3 plasma's for $100.00 and fixed and sold 2 and the only one remaining was the 50pc5d which had no power. Simple diagnosis was power supply had no output. I picked up a power supply on ebay and now I had all my voltages and relay would click and fan would run, but no display. I figured the y sustain ipm's were bad so I ordered them thru a china distributor that I had used before. I have been pretty successful replacing ipm's using a heat gun to preheat and a desolder gun to clear the solder and they pull off pretty easy. Have done about 10. I also bought new? buffer boards because I didn't like the reading I got off the old ones. Used the Coppell tv test. Got every thing done and got a picture. Pulled up the menu and after about 5 minutes the screen started flashing and then it went pink/purple but I could still see an image of the menu. I removed the bottom buffer and the top half was still good. I checked the lower buffer and two fet's were bad. I replaced the fet's and reinstalled the board and normal picture again for about 5 minutes. Then the same thing happened but this time it flashed on and off repeatedly. I removed the lower bufffer and now the top half still flashes pink/purple display and you can still make out the menu. So now both buffer read bad fet's. I checked Vy and Vscn and the voltage was steady and about 1 volt off the panel label. I hate to get two new buffers only to get them wiped out. Almost think its a bad ipm but thought I could use some advice on what to check next. I did check the ribbon cables and all connections. So am I crazy and should I just scrap this or?? I feel now like its a quest to go ahead and keep going. Thanks

[gdawg]

Re: 50pc5d LG Plasma

Didn't hear back from anybody and I believe I fixed it through persistents. I was replacing the ER IPM on the y sustain and was checking my solder work for bridging. I was looking thru a magnifying glass and just happened to see a cold solder joint on the ER caps-the orange ones. I could move the lead with my finger nail. I guess I over looked the obvious. Thought I 'd post my results for anybody with the same problem. You could not see it with the naked eye. I also guess thats what was blowing the fet's on the buffer boards. Thanks

[alekshernandez]

Re: 50pc5d LG Plasma

Wow gdawg,
you are persistent. I have a no power on same model. Free tv. Will inspect the insides and check back with you. May be you can assist in the testing-diagnosing steps.
thanks for ur posting

[Gregg Arnsperger]

Re: 50pc5d LG Plasma

gdawg. Hello. My name is Gregg and I'm over here in Gilbert AZ. I have a Panasonic TC-P58S2 then recently went out. I found some "Blink Code" info on line (7 blinks) and was searching for more information on line when I stumbled onto the site. I then noticed you'd had the same issue with the same model and was wondering if you'd actually fixed your issue. If so I was wondering if you'd be kind enough to tell me what board you'd replaced (or fix) so I could buy one and fix my TV. Any help would be greatly appreciated. Also you may call me on my call phone at 602-614-6294 if you'd like. Thank you in advance.