Question about Sanyo DP42849 42 in. HDTV
Tv powers on, but picture goes blank after a second. i replaced both master and slave inverter boards but no luck. please help
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Posted on Jan 02, 2017
SOURCE: Inverter opertion
If the inverter board is bad, I would suggest that you replace the whole board unless you have a SMD (Surface Mounted Device) rework station, and a background in electronics. I have worked on TVs where people have tried to remove SMDs and it never is an easy thing to do, so I would again suggest that you replace the whole board, because all of the components are SMDs.
Now as to your question, I have seen on these sets the majority of the time it is a driver transistor that goes bad.
I hope this helps,
Posted on Nov 28, 2008
SOURCE: Have a Sanyo Plasma TV
Yep. The power supply in Sanyo Plasmas are generally prone to failures. It could be a failure in the panel not priming, but I doubt it. Turn the lights off in the room, then try to turn it on. If you see the screen faintly flash, the panel is priming, but it is not coming on. If the screen is lit, but is still "black," then it is a control or digital board. If it is totally black with no light at all, then it doesn't entirely rule out the first two, but makes a power supply failure more likely.
They usually have a lot of heat damage to them. If you have tried unplugging it for 15 minutes, then plugging it back in and it still doesn't work, the it is most likely a secondary in the power supply.
I hope this helps you...
Posted on Jan 10, 2009
It sounds like you have a power supply problem, this powers the inverter! Where you just replaced the inverter, we could assume it is good! Look for some bad caps (capacitors) on the power supply board. They will look bulged on the top an may be a little leaky (brownish stain). The power supply can fail on some output and be good on others. Was the back light inverter new? If all else fails, see if you can return the back light inverter and get another! I hope this is helpful!!
Posted on Mar 02, 2009
U have LED front power tv light come on and bliking?Than ur power suply it dead.Power supply board must be replaced.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board.
Posted on Feb 10, 2010
U replaced the 1 or 2 LCD inverter long boards,still the same problems.Sorry,this is a rare problems,but it seem the Tuner board is the problems.Replaced the Tuner board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner signal board for the replacement.
Posted on Oct 08, 2010
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