Question about LG 42PC1D 42 in. Plasma Television

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Tv repairs i have a 42 inch plasma tv which has sound but no picture not even any white bits in the background as if you didnt have the ariel plugged in can anybody help cheers ROD

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  • Anonymous Aug 07, 2008

    Sound but no picture from any input



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My tv image goes off while watching tv,I do have audio but no image.

LG 42LS5700 - > Home > Support > Product Support

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Check high voltage circuit. This is near where the 120 volt cord is plugged in and a high voltage transformer, where there should be capacitor (or two). Check the voltage - should be 390 to 400 volts. If not less than 390, near to replace the capacitor.

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This is almost certainly the device that sends electricity to the the plasma in the panel after failing. Bring to your local repair shop and expect to pay 300-400 parts and 100-200 labour.


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1 Answer

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All I can tell you is that you maybe have left your T.V. on a channel that didn't move for so long, or maybe someone else did and it burnt the screen. Plasma's run off of plasma gas to create the great picture and they collect on the screen and stick. What you need to do is go to your menu and look for "screen burn protection" and put it on white and let it sit for 20 minutes. All of one color such as white doesn't harm your T.V. The only way anything burns is like a bright white line in front of a black background.

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1 Answer

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This type of repair might not be a DIY since requires the use of a multimeter to check all the voltages from the power supply to all the circuitry in your plasma.
First step should be to measure all the voltages to the Y and X sustainer boards and since you do not have audio as well to check the 12 volts source as well.
If your plasma is less then a year old, still cover under manufacturers warranty.

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Hav 50 inch lg no pic but got sound wtf how do i fix it an there r 5 flashes b4 green light stayes on at the start

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You have a burn in problem from watching widescreen movies.If you have access to a signal generator or tv setup disc run a perfectly white screen on the plasma for about 30 min.This should help even out the pixels on the display.

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If the Video (Picture/Pix) is gone but you can hear the Audio (sound), then it could mean the YSUS PCB Assembly is gone/kaput/finish. Can replace the PCB, not repair the PCB due to timing circuitry involve. Cost maybe roughly $500 depending where you located. The PCB is located on the left hand side of your TV when you are facing the back (Back open). Might find 3-4 brown flex membrane connecting to the plasma panel. The PCB has a silver or black aluminum heatsink (big) on it.
Good Luck.

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1 Answer

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ysus pcb that supplies voltage to the panel is faulty

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