Question about LG 50PX4D 50 in. Plasma Television

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I have an lg j250r 50in which did not turn on.After searching on the panel i found they were 5 transistor which were short so i replace them from another 42in which had a broken screen.I also took the rf panel from the 42in and put it on the its switching on but the screen is not full its just occupying an upper corner the rest is dark.Tried to adjust vs voltage port but no change.Vs voltage is 203v and Va voltage is 58v which seem to be normal.What shall i do? The Rf panel m refering to is the panel which host the rf socket ,hdmi av.there is some surface mounted capacitor that are short thus i replace with a 42in one

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If the buffer drive bds. were replaced along with the ysus and zsus and this problem occured it is definately and defective pdp.

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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.

Posted on Oct 11, 2009

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yes ok this can be alot of things bad it could be just one of the fans not working and the unit shuts down to protech the lcd screen or i could be something bad . now when i work on thisunit i have found that the display power boards that is mounted on the left and right side of the lcd panel on of them is bad . now thee is a way to find out but i dont thing u can do it. but i wil tell u how. u have to jump out the prot transistor and un plug the plug that goes to the lcd panel if the unit stays on u will not see any picture u will only here the sound then u know that is is your panel and it is not cheep to repair. now if it stills shuts down u would have to troble shoot the other boards. iam soory i gave u bad news when u buys lcd screens u have to have big money to have it repair, let me know how it when marty

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