Question about Sony FD Trinitron WEGA KV-30HS420 30" TV

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Clicks but crt does not turn on

The Tv clicks and CRT comes on for a second before it goes into the protection shutdown. The LED flashes 6 times and sometimes 7 times. I checked the voltage accross IC501 as suggested in other posts and one of the votages is higher thatn it should be. thesymptom for the 6 LEd flashes suggest overscurrent and bad IC 504. I don't know how to meassure the voltage on the IC504 however as it has 4 prongs instead of three. My question is if there is something that may be causing this. Please help! I can offer you the Service manual for the KV series TV in return...

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The Tv clicks and CRT comes on for a second before it goes into the protection shutdown. The LED flashes 6 times and sometimes 7 times. I checked the voltage accross IC501 as suggested in other posts and one of the votages is higher thatn it should be. thesymptom for the 6 LEd flashes suggest overscurrent and bad IC 504. I don't know how to meassure the voltage on the IC504 however as it has 4 prongs instead of three. My question is if there is something that may be causing this. Please help! I can offer you the Service manual for the KV series TV in return... you seem to be a techanical person so answer is purely technical. Clicks but crt does not turn on 1 check whether power supply out put is ok.by disconnecting h/output 2 if it is ok check hor. section that is eht is ok or not as without eht crt will not glow. check crt supply &loose connection in crt base. regards thanks

Posted on Sep 11, 2007

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Here is a list of the problems that might have occurred indicated by the number of blinks:

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* 3 blinks = B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.

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Try first leaving the TV power cord unplugged for some times, let say one hour or so.

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2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


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If you are in situation 2 , then there is an internal fault.

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Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

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