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Sanya DP42840-00 POWER ISSUES inverter board problem

I have a Sanyo dp42840-00 that I have went thru the steps of troubleshooting and came to conclusion according to service manual is its bad inverter board. I was wondering if there was way to fix at home? Tv turns on for 3 seconds then back off, I can also click 3 times in row then pull ac out to get it out of lockout mode. Now on the main board when I disconnect the K8L connection the backlight comes back on but off again in 3 seconds. With that connection connected backlight stays off. I checked caps and voltages all seemed ok. Any ideas without replacing entire boards by chance?

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  • Paul Henry May 08, 2013

    i tried to check everything bud Martin said. I have correct voltages both 24vdc and 12vdc I'm looking at the inverter board and don't see any fuses? help greatly appreciated.

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: VIZIO LCD 26 INCH model# VW26L HDTV10F NOT TURNING ON

unplug ur backlight inverter plug &power on to see ,if it doesnt on , change ur mainboard

Posted on Nov 10, 2008

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SOURCE: Sony KDL-46s2010 4 red light blinks

I would suspect one or more of the miniature flourescent backlight lamps. One way to confirm this would be to power up the set with a grayscale image at 40 to 60 IRE. If one or more lamps is failing to light, a slightly darker horizontal area in the grayscale will give it away. Unfortunately, Sony will not supply any of the backlight components apart from a new LCD panel. Sorry.

Posted on Sep 01, 2009

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SOURCE: TV green lite comes on for 2 seconds--goes back to

you posted the model number in reverse-----32pf double check-only thing i found so far -------replace c601 470/25v
someone else found a bad FET did u check them
do u have a pdf of this one

Posted on Sep 16, 2009

BoiseLCD
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SOURCE: I have a NS-LCD37-09 tv. No picture or backlight

Your main board is faulty. I've done several of these but haven't been able to figure out which component is actually bad these yet. I've simply had to replace the board itself, and it fixes it every time. One thing you can do to get your backlights to come on (and so you know I'm not Jive'n you) Is unplug the three wire bundle that spans from power supply to main board. This will usually make the backlights fire up. I even had one that after I left it that way for a minute (with the backlight on) it suddenly started working again! But this was short lived. :-(
One time I even tried recapping the entire main to see it that would fix it. It did not. I think it might be something to do with the small chip labeled SL37HA37. It's a 16 legged bastard near the 3-wire plug I told you to pull. It's that or possibly the bigger IC near it that has a heat sink on it. The ball grid array solder joints may be faulty. Just guesses, if any smart guys out there figure this one out, be sure to tell the rest of us please!
Thanks, Chris Boise LCD www.boiselcd.com

Posted on Apr 23, 2010

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