Hi, I have been working on this plasma for a bit. It gets sound but no picture. I have checked voltages and everything seems ok but one pin that says (M5v_on) but reads 3.2 volts. Could this be the problem? No caps look bad and boards looks good. I also tried taking off the top buffer board and got scramble image on bottom half, but then put top back in and took off bottom and got nothing (total black screen) So this leads me to believe the top buffer board is bad, but then if the voltage is 3.2v instead of 5v maybe the top buffer is not getting enough power? Any thoughts before I go spend money? Thanks for the help. I have read that the sus boards, cold joints, and bad caps are very common with this model. Tv turns on fine and stays on.
It sounds that you are something in electronics, and can understand the things well. Check the site liked below.
SOURCE: Picture gone on an LG 42pc1dv-ec plasma. Sound OK,
Your Vs voltage is high, check if the heatsinks on the Z-sustain board are getting hot after a short time, if so replace the Z-sustain board. If not, dis-connect the Vs & Va plug connection to the Y-sustain & check if the voltages are normal (185V & 80V). If they are then your fault will be in the Y-sustain board. There is a possibility the control board (sits below the power supply) could also be a problem as it is not able to initiate the control to the sustain boards.
SOURCE: Issue with LG Plasma tv model # DU-42PX12X
Another "same probelm"
My set has encountered this magical 50/50 split screen and it seems to be quite a problem since I am not the only one researching this issue. LG was of no use because of course it is just out of warranty. Any solutions on fixing this or am I out of money in buying a new plasma?
SOURCE: to make a long story short originally bought the
Sounds like the y sus was blown out but what cause it. Were you careful when you were checking voltages? As long as you didn't short 2 components together, your y sus should be fine. Unless the y buffer up and/or down blew them out. Even the panel could blow it.
Basically you need a scope to adjust the ramps and everything. You can adjust VA and VS with a meter. If you don't have access to a scope, then just start changing the ramps etc by eye. It might take a little bit to get but eventually you'll get it.
SOURCE: PLASMA TV PROBLEM
The problem with this set, is defective YSUS board, to avoid future same problem, you must change the following boards: YSUS, ZSUS & Control.
Verify with LG if your serial Number is included within
lots production that were recalled by this design defect
Testimonial: "I'll try to contact LG dealers. Very hank you sir"
SOURCE: while checking Vscan voltages on my LG du-42px12x picture died.
I have the same problem the pic went out but have sound. where do i go to get the Yboard? do i need a special number off of it or something? I took it to repair shop and he said it would be like 500 dollarss to repair. but i see all kind of yboards on ebay for like 150?? how do I know what one to buy?
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Thanks for the help. So it turns out I was right and I replaced the upper diver board and everything works great!! $70 board and now have a great 50" LG. Hope this help someone else.
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