Question about Sony FD Trinitron WEGA KV-34HS420 34" TV

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I have a Sony Wega KV-34HS420 TV that takes several tries to turn on. When I push the power button or remote power on I hear the normal click and the sound comes on for 3-5 seconds but then I hear a second click and the TV shuts itself off before the picture comes on. If I go through this process 3 or 4 times the TV will stay on but it is getting worse and I am guessing that eventually it won't turn on at all. On the tries when it doesn't start the stand-by light is flashing 7 times. Any idea what might cause this?

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  • T.l. Moore
    T.l. Moore May 11, 2010

    there are two to three regulator ics in the power supply and they become flakey and cause a mess of problems PART no MCZ3100 on the smps deflection board there are 2 and some times a third on the signal board that for the horizontal drive replacing these will usualy correct this problem

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My sony the wega, does not want to switch on. The timer light just keeps blinking

Posted on Dec 23, 2009

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Since the set appears to "recover", it suggests either a poor solder connection or bad cap somewhere in the power supply. The 7 blinks indicate the problem circuit is in the horizontal area. Check the regulator (STRxxxx) IC in the power supply. If you do not have experience working with TVs, please refer this repair to a shop. The regulator IC costs around $25.

Dan

Posted on Nov 16, 2009

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