Question about Sony KP-46WT510 46" Rear Projection HDTV

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Zero crossover you answered my question on the nine blinks where can i get a zero crossover detect diode for the power supply?

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  • todouble53 Dec 31, 2008

    it blinks 9 times chanched diode and still not turning on what should i do?

  • todouble53 Dec 31, 2008

    what is the part number for that zero crossover detect diode ?

  • todouble53 Dec 31, 2008

    I have a sonykp-46wt520 the standby light flashes 9 times over and over again what should i fix?


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Are you sure it's 9 blinks or is it 8 blinks.?

Posted on Nov 16, 2008

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What is causing my sony #KP-51WS520 to blink nine times when power button is pushed but does not turn on

Based on the service manual 9 blinks mean: Zero Crossing Detector.
Problem in Deflection or Power supply board.

Aug 14, 2014 | Projection Televisions

1 Answer

No sound, no picture but timer srandby light is

If the stnadby light blinks 9x, there is a leaky diode in the G board(5Volts standby circuit) causing the problem. I don't have the service manual but I remember it's the D6301. To make it sure check all 8 diodes including the one in zero detection circuit(all in G board). Hope this helps :)

Dec 25, 2009 | Sony KP-46WT520 46" Rear Projection...

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Sony Wega kp46wt520 no power up, 9 times it blinks red

You will need to replace the G board. You can try replacing the two diodes that usually fail, But because its a complex circuit with the zero cross detection the diode replacement never fixes the issue. Replacing or remanufacturing the G board is the only sure way to fix that issue.

Nov 28, 2009 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Stand by light flashes 9 times

replace the zero crossover detect diode in the power supply.

Nov 11, 2008 | Sony KP-57WS520 57" Rear Projection...

1 Answer

No picture or sound

replace the zero crossover detect diode in the power supply

Nov 05, 2008 | Sony KP-57WS520 57" Rear Projection...

2 Answers


This is called a zero cross detect problem and has to do with the power supply. There are one or two bad switching diodes in the power supply

Oct 17, 2008 | Sony KP-57WS520 57" Rear Projection...

1 Answer

Sony wega kp46wt520 problems

Diode D6116 or D6301 on G board are open . Check the diodes and if open replace them that should fix your set about 10.00 if you need to know where to get the parts let me know and I will post the link. also tell ya how to check those diodes if you dont know how.

Apr 01, 2008 | Projection Televisions

1 Answer

Rear projection t.v.

Hills, zero detect circuit is failing because of noisy diodeds in the power supply, without a model number thats the best I can do for you, common issue that any local tech should be able to fix in half an hour, BMW Rider

Dec 30, 2007 | Projection Televisions

1 Answer

No picture

The Zero detect circuit is hard to diagnose and usually you just need to replace the G board to repair the problem.

May 20, 2007 | Sony KP-51WS510 51" Rear Projection...

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