Question about Sanyo DP42740KNB 42 Class Plasma HDTV - 720p, 1024 x 768, 16:9, 600Hz,

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My 42" Sanyo Plasma turns off and wont stay on. What do I check

Shut off and clicks then no power. Unplug for hours then comes on for minutes and does same thing. How do I fix it? It is about 3 years old. cannot afford $700 for new tv

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  • 186 Answers

Contact the maker of the TV.

Posted on Dec 08, 2014

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Sanyo Vizon 42" Plasma DP42746 Was using tv when I heard a click and I lost all audio and video, could not change the channel or adjust volume. Tried unplugging and sitting for 10 minutes. Plugged back...


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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Sanyo DP42746 42 in. plasma TV


Well I have the same problem with green light and no sound and no pix. After i opened it all up i checked the main power supply board and found all fuses good and the 12vdc side of the board dead. My best guess is this power board has many problems. All the driver boards for the screen are located on the perimiter of the screen. If you loose part of the power supply board you will loose part of functions of the tv. At this time i am looking to replace the entire power board. Will let you know the location and fix soon as i find it. jim jamesgibson@nycap.rr.com

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