Question about Sanyo DP42746 42 in. Plasma Television

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Sanyo DP42746 42 in. Plasma No Video

When I turn the power on I hear the relay kick in but there is no video or audio. I took the back off and the LED blinks 12 times when I turn the power on. Does this mean that the 12V supply is gone?

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  • Tongtae May 19, 2008

    I have same problem, no video nor audio. it blink 12 times. please help. Thanks

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To test all y sub boards remove the main power connection to the y main and turn the tv on if it powers on one of those boards are bad.. remove both sub boards. and plug in the y main. if it powers on then that board is good either, put your multimeter on 2k omh and test the upper ysub boards black connector, the top 2 pins with negative to the 5th pin positive. you should read 500-1k ohm if its way under 100 there is a short.

the bottom ysub board place the multimeters black probe on the bottom 2 pins of the black power conection and the red on the 4th pin.. results are the same.

low resistance means theres a short in the board.

Posted on Oct 23, 2011

I am having the same issue, did anyone find a fix for this problem? Flashes 12 times and then clicks off and LED flashes 12 times and repeats the cycle.

Posted on May 17, 2008

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  • Sanyo Master
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This can be a power supply failure, or a short on one of the boards. The flashing LED is indicating that the set is in "protect mode".


Jerry G.

Posted on Apr 12, 2008

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Its the power supply not to exspensife to fix do you hear a click and the red led display light come on

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This is a common problem with these TVs. You can download the official Sanyo repair manual for this TV (DP42746) at http://www.eserviceinfo.com/downloadsm/43343/sanyo_dp42746.html. I uploaded it here when I had the same issue with my TV last year. The solution is almost always to replace the Power Board (Y-Main) and the Upper and Lower Y Buffers. The parts and costs (from Sanyo in July 2009) are listed below (NOTE: Sanyo will not ship these parts to anyone but a repair shop): 1. V4 Y-Main (Y-Sustain) Circuit Board (Part # LJ92-01200A, Alt Part # LJ41-02759A) - USD $139.00
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3. Lower Y-Buffer Circuit Board (Part # LJ92-01203A, Alt Part # LJ41-02761A) - USD $64.00
Sanyo charges USD $10.50 for shipping, which brings the total cost for parts to USD $277.50. From my research, a shop would probably charge between USD $500 and $700 to do this repair. FYI - there is a class action lawsuit pending against Sanyo for this issue. The V4 Y-Main (Y-Sustain) Circuit Boards fail VERY frequently in this TV due to overheating. Hope this helps.

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2 Answers

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If you unplugged the Ysus board, then you need to replace the Ysus board, or both sustain boards. This is the part: The part is often available on Ebay, or from manufacturer. Look also at Vance baldwin or Partstore. To do a good job the Sustain boards should be tested by a tech , following service manual. It is almost for sure sustain board by the way.

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I need to know how long do you have the tv?In the other word,approx. how many hours you have put into it?
Secondly,did you wall mounted the tv or setting it close the the area which there is not much room for the back of your tv to breath?
solutiondoct

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Sanyo dp42746


Problem is on the Y sustain pwb, to the left of the power supply. To varify, unplug the connector from the power supply going to the y sus. The set should then start up, and you'll have audio. Call sanyo at 1- 800-877-5036 for parts. Or www.shopjimmy.com for used circuits at a discount price.

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Wont turn on


I have the 42pf9956/37. Same thing.
I took off the back cover and tried the power and found the relay that was clicking. I have two blue relays in the middle of the board.
I took a haid dryer and placed it over the relays.
After a minute I tried the power and after 4 times it stayed on.
Not sure why, but it is free.
I won't turn it back off soon though.

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42PF9956/37 SHUTSDOWN...


Ok. I got my tv back on.
I pulled off the back cover and found the relay that was clicking.
I have two blue relays next to each other that click when the power is pushed.
I placed a hair dryer over the relays for about a minute.
Once heated up, it only took 4 tries to get the TV to stay on.

Jan 03, 2008 | Philips 42PF9956 42 in. HD-Ready Plasma...

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