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Sound ok , no picture no VS&.... volts

How can I fix power board?

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First check caps, then diodes, then resistors, if it turns on your problem with no video indicates backlight(s) being burned out

Posted on Jan 24, 2009

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I just repaired the TV.. It's the main power board that's causing the problem.The biggest board in the TV. I took a metre to the old board and it's failing on the VS circuit. I was only getting 14volts when i should of been getting 78 volts or something like that. If you look on aluminum backing of the screen .. top right corner there's a sticker which tells you what the voltages should be for the VS and a few others. It's the 10 pin socket top left corner on the main power board. VS is the first 2 pins. That's the part of the cuit that caused the screen not to light up. I had audio and power but no picture. All the other readings I took were normal on the board that was failing. Only the VS reading failed with the 14 volt reading. I put in another a good used main power board and took a reading from the VS pins and it was normal. I connect the cable to the y board and the TV powered up and is displays fine. If there's someone who does work on low level cuits and finds the actual part that is failing I would like to know. I replaced my board with a known good one and traced it too which part of the cuit failed. I suspect it's just buying time and don't plan on spending another $100.00 on another board after this one. So any help would be great. Thanks for all Craig

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1 Answer

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Remove the power supply cable to Y Main board, check Vs on power supply board when you turn on tv.
1. If you have normal Vs, replace the Y Main board. If still not work, replace the Logic board.
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Remove the Power Supply cable to Y Main board and check the Vs voltage in Power Supply board.
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