I have a panasonic vierra 42" plasma tv that has the top half of the screen greyed out. Any ideas?
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Re: Top part of screen greyed out
Can you supply a picture of the fault? It is hard to tell what you mean by "greyed out"...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: Top part of screen greyed out
Here are the pictures of the tv.
The left side board is the Y SUS board I took out of the tvAttached FilesComment
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Re: Top part of screen greyed out
Probably Y-buffer fault. (SU or SD)
Can you see Vscn test point on SC (Y-sustain) board?
Please check the voltage and see what it is measuring. It should measure 120V to 150V wrt to -Vad (usually it is measured across a resistor.)Last edited by tom66; 08-24-2014, 04:44 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Top part of screen greyed out
I can smell something hot on the Y SUS board. The tv eventually shuts down after a few minutes on. I will get the voltages for you soon.Comment
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Re: Top part of screen greyed out
I found another board, any idea what this does?
Attached FilesComment
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Re: Top part of screen greyed out
I found a load resistor damaged and looks like it has a burn mark on it. It also gets extremely hot and is the burning smell is from this part. Problem on Y SUS board or the SU board.
It is on the left side board (Y-SUS)
Attached FilesComment
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Re: Top part of screen greyed out
I get only 40 volts on Vscn. My Ve, VSUS are both good.Comment
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Re: Top part of screen greyed out
I FIXED THIS TV. It was an open circuit 0 ohm SMT resistor on the SU board. Fixed and tv now working YAY!!!!!!!!!!!Comment
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Re: Top part of screen greyed out
Nice job. How did you find the shorted component ?Comment
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Re: Top part of screen greyed out
Nothing shorted but the 0 ohm resistor measured OL in and out of circuit. This service manual for this tv actually had all the schematics which helped immensely.Comment
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Re: Top part of screen greyed out
Nice fix! Could you show us exactly what resistor for future reference? Or the component # on the schematic?
Yes, I do like that Panasonic provides full service guides for their plasmas - something for other manufacturers to look at doing. (I wish.)Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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On an external monitor connected to the VGA the picture is good.
So basically I have a horizontal division, below which the screen is all white. There is no apparent damage to the screen or any vertical lines
I tried cleaning the pins on the LVDS connector plug/socket as thy looked a bit dirty (18 pins plus...
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