Question about Zenith P42W46X 42 in. Plasma EDTV

3 Answers

Zenith 42" plasma p42w46x

My plasma suddenly didint want to work all i see is yellow lines but i can still hear the audio but cant see anything but vertical lines

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3 Answers

Re: zenith 42" plasma p42w46x

If you know anything about electronics, I have one with the same problem, but haven' looked at it yet. I have two that the screen flickers, found a couple bad electrolytic capacitors on the Y-SUS board. I took a good high voltage capacitor and bridged the aluminum surface mounted capacitors, one by one, and when I bridged the bad one the picture was as good as new, replaced it, no more problem. The TV doesn't have a good design, but they probably designed it so the high heat from the heat sink cooks the capacitors mounted above, just when the warranty has expired. I think I'll mount two cooling fans on the heat sinks to dissapate the heat

Posted on Dec 19, 2007

Re: zenith 42" plasma p42w46x

I have the three zenith plasmas, I've fixed the two that were flickering. The one with the verticle lines, I sawpped the Z-SUS and the Y-SUS from the good TV to the bad and still had the white lines. I looked at the two boards hooked together with 3 aluminum covered ribbon cables that are in the lower center of the TV with all the video inputs, on the far left there is a right angle connector that has about 20 pins, the white cable comes out and goes under to a circuit board this looks like this cable supplies the video signal to the screen. I disconnected the cable and the screen went black, all the voltages going into the video board are normal, so there must be something fried on one of the two boards, there are a LOT of electrolytic caps on those boards. I will post when I figure out whats cooked, you may have the same problem too.

Posted on Dec 26, 2007

Re: zenith 42" plasma p42w46x

I have just had the same problem. It affects both the component inputs but the A/V inputs are OK. If I disconnect the green input, the screen goes black and displays "No signal." Service guy came out and said the Y-board needed replacing. Haven't done this yet

Posted on Sep 05, 2007

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My Zenith P42W46X 42 inch tv got two black lines vertical lines on the screen the were coming and going away before but they are more stable now.i opened it up and wiggled all the connections arround the...

There are 4 or 5 ribbon cables on the bottom or on one side, they control part of the plasma screen. Check the ribbon cable near the black lines. Unplug the ribbon cable and look for black chips on the underside of it, I think they say 100 on them, you need to resolder both ends on each chip. Should fix the black line issue.

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If the unit is only 10 months old, it should still be under manufacturer's warranty. Call and request warranty service. DO NOT open up the unit as that would void the warranty.

Keep us posted on what is found.


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1 Answer

Zenith P42W46X 42 inch EDTV

common problems with these, usually customers here a loud pop. then the screen goes blank. I would try...
Some of these have a 4 pin test on the control board that you can jump with solder to get test pattern. If you get it to do that then these boards maybe good and would replace the control board. if nothing happens, then
the upper & lower drive also the Ysus and Zsus boards all at the same time.
last could be a defective panel.
hope this helps. p/n are on all the boards.

Jul 22, 2008 | Zenith P42W46X 42 in. Plasma EDTV

1 Answer

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It might be one of the power supplies. There are three in this model. One for the sound, one for the video, and one for the computer components. The video power supply is probably shot. They cost about $200 a peice from LG. If there was a "pop" sound when the video stoped, then it might be one of the circuit boards in the back. Yet again, they are three, each costing around $200 from LG.

Dec 26, 2007 | Zenith P42W46X 42 in. Plasma EDTV

2 Answers

P42W46X Zenith Plasma - No Picture - Mostly Yellow on screen

Mine looks like too, but the line running across isn't on my set, picture looks like this, and the sound works fine. I took the tuner board all the way out and turned the set on and it did the same thing, then I unplugged the top wire on the board next to the tuner board and the screen went black. plugged it back in and the screen came back with the scrambled picture. Anyone know why? Bad mainboard maybe? the left of the tuner board?

Nov 25, 2007 | Zenith P42W46X 42 in. Plasma EDTV

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