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Dp50740 power led goes on and off

I have a Sanyo dp50740 that I bought knowing it didn't power on. Bought a new power supply board for it, and now I get an audible "click" with the power LED coming on for 5 seconds or less, then turning back off. Any ideas on where to go from here? Thanks.

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  • Sanyo Master
  • 933 Answers

What you have is most likely a failed main board. These sets are known for this problem. There are several different variations of the main boards. Make sure you order one that matches yours. The main board part # will start with J4@#. The main board part # should be on a sticker either on the main board itself or on the coax input terminal casing. I hope you got the TV for a good price !!!

Posted on Sep 02, 2012

  • 8 more comments 
  • Dustin Loomis Sep 04, 2012

    This is my first TV repair, but I come from a strong computer repair background so I think I'll figure it out eventually. Didn't pay much for the tv since he thought it was junk. Will let you know what happens when the main board comes in.

  • Dustin Loomis Sep 08, 2012

    Replaced main board, still not firing. Same thing. Any suggestions?

  • Back2life Electronics Sep 08, 2012

    May I ask where you purchased the main board from? When you plug in the set, does the standby light come on? Did the previous owner mention anything about the set being hit by a surge?

  • Back2life Electronics Sep 08, 2012

    also, do you have a multimeter handy? We have to start checking voltages.

  • Dustin Loomis Sep 08, 2012

    I got the board from eBay from a seller called Payless Components. I ordered a power board from them and that worked fine. No mention of a surge, just wouldnt turn on one day. Yes, I have a multimeter. How do I check voltages off the power board if the fail safe is tripping? Standby light does not stay on. Power board clicks on first attempt, with solid power light. Then light flashes and off again. Trying again without unplugging will not produce click.

  • Back2life Electronics Sep 09, 2012

    Plug the set into an outlet, and check the standby 5vdc power supply. There should be a terminal(s) on the power supply that are labeled 5vdc. Also take a peek at the buffer boards, y & z sustain boards for signs of damage.

  • Back2life Electronics Sep 09, 2012

    I've come across a few Sanyo plasma TV's that would come on, then turn themselves off. In those cases it was the main board.

  • Back2life Electronics Sep 09, 2012

    A defective main board could cause your problem, as well as a bad power supply, a bad Y sustain, Z sustain or buffers boards

  • Cristina Martinez
    Cristina Martinez Feb 12, 2019

    How didi it go ? Did you fixed it im having the same problem with a tv that i bought a week ago i changed the power supply board and it didnt worked just like yours.

  • Cristina Martinez
    Cristina Martinez Feb 12, 2019

    How didi it go ? Did you fixed it im having the same problem with a tv that i bought a week ago i changed the power supply board and it didnt worked just like yours.



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SOURCE: Sharp LC-26D43U Power light flashes and unit won't turn on?

It's a power supply related problem. When it turns itself off, this it called protection mode. The TV automatically turns off to protect other parts form being damaged.
The most common problem is the Power Supply Unit or the Backlight Inverter Board.
You may have to take the TV to a repair shop to find out which one is bad. Paying a repair shop to replace the board for you maybe more than the TV is worth. If you let them diagnose it and you replace the bad circuit board yourself, it would be cheaper.

Here's a place I use to get parts for TVs:
The problem is the repair shop may charge you double or three times of what the part costs at the web site link above. Then, plus labor. I just want to save you money. :)

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SOURCE: Panasonic TH-50PE700U red light flashing 6 times

Replaced the sc board and tv works fine again.

Posted on Jan 22, 2009

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SOURCE: samsung s42sd-yd01 plasma television wont power up

hI MY NAME IS COL, COLINDAWSON@ROCKETMAIL.COM, I have the same TV with the same problem. It has something to do with a 'dew' sensor inside that trips it out when it senses moisture. It seems after a while the sensor gets carried away and cuts the unit out as it is with your TV. We found if you blow a hot hair dryer through the vents at the back for a few minutes, it will eventually come back on. Once the TV is warm the problem stops. I dont know exactly where the sensor is, and if you find out id love to know. Hope this is of some help. Also im trying to find a replacement remote for the same TV as mine is missing.

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SOURCE: pioneer pdp 502mx goes to standby no picture after power on

Contact Pioneer at 1-800-421-1404 about getting an in-home power supply replacement. This is a known issue with some plasma displays. Some of you would experience a loud pop and then the power supply fails. You get a red light below the ON button, when you press on, the red light will turn green for a second and then back to red. The plasma display will not turn on after the power supply fails. Call Pioneer at 1-800-421-1404.
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Posted on Mar 29, 2009

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SOURCE: I have a Polaroid 42" TLX-04244B. When turning the

The Inverter is trying to produce the high voltage to light the backlight. It looks like it cannot hold the charge to maintain the high voltage level in order for it to stay on - you get a momentary display at initial power-up thus see the logo. Replace the Inverter board.

Posted on Oct 24, 2010

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