Question about Sony FD Trinitron WEGA KD-36FS130 36" TV

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Powers on but no sound & no picture

Was told the main board and HV wire need to be replaced, does this sound right?

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If you power the TV set ON, count how many times the light on the front blinks?
Is very unlikely you have to replace the whole main board.

Posted on Feb 07, 2008

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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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1 Answer

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In your case, it is likely that the latter (HV) supply has failed.
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It is possible but unlikely, that the main power supply is not providing voltage to the HV board for the display.
If replacement of the HV board doesn't restore the display, then it will be necessary to replace the main power supply too.

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