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Sanyo TVs usually only have two boards in them , doing a
visual inspection of the power supply capacitors usually reveals swollen
or bulging capacitors.
If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board
If there is still about ? 24. Volts coming from the Power Board when it goes dark, it will be the Inverter board that needs replacing. If not, it is the Power Board that needs replacing.
The Voltages should be written next to the sockets & plugs on the Power Board.
Check the power board for any domed capacitors. Replace them. If this does not fix Replace the power board. You can check the voltages from the power board. they are labeled. VS and VA voltages are the panel voltages.
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
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.
2. If you don't have normal Vs when you try to turn on your tv, just replace the Power Supply board.
Remove the Power Supply cable to Y Main board and check the Vs voltage in Power Supply board.
1. Vs voltage is OK, replace the Logic board or Y Main board.
2. Vs voltage is NG, replace the Power Supply board.