Remove the back cover.
The switch mode power supply board is in the middle at the top. It's a large board.
Along the top edge of the board the model number will be printed. It should be a bn96 00249a but check to be sure before ordering one.
Take special note of the 5 fan headers located on the lower left of the board - all unused.
Explains why so many of them have failed.
Mine has been dead for almost a year now.
I know which part on the board is bad, but so far, have not been able to locate a place that will sell me the IC.
I'm not paying $300.00 for the whole board when all it needs is a $15.00 IC.
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Tries unplug,replug tv back in like an hour later.Now the tv is resetting itself back to the factory setting.The tv should work now.Not,than the power supply board is the cause.That the board,where the power a/c cord plug into it.That the power supply board.Try website like Ebay.com to buy a refurbish power supply board for the replacement.
U know basic electronic's,have tools and know basic soldering?Take the tv aparts.The power supply board,that the board where the power a/c cord plug into it.Searches the power supply board for these dying to be dead capacitors have gases leakages.These capacitors alway bulges up on it tops or puff up on it tops.Replaced these dying to dead capacitors.Or tries websites like shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Although this is not the exact service manual for your tv, it does have the same power supply.
As a matter of fact your akai is a samsung tv.
the replacement of that board is easy since it is all plug-ins and you can find that power supply in quite a few places,
Just google that part number.
Hope this help and good luck
Try replacing the Y-sustain board. Might have to replace buffers attached to it too. Have you had it diagnosed? My picture went out and I replaced the power supply board. Worked for 2 weeks then acted up again. Got a different power supply board. Same thing 2 weeks later. Was told it now was a bad Y-sustain board. Replaced y-sustain board. Worked OK for about 2 hours then started having picture issues. Not the same issues before power supply or y-sustain problem. Was told that you might have to replace buffers attached to y-sustain when you replace y-sustain. Tired of dealing with it and only watch a couple hours a day, so I don't always have the problem unless I watch the TV for a long time. Will eventually replace buffers to see if that works. I would definitely find a place that gives free estimates or close to free to get a technician diagnosis. Then you can decide if you are able to do the work yourself.
Normally the sets have seperate power supplies for the input/main logic board and the HV which drives the panal (could be 2 parts on the same board). It sounds like you have a problem with the power board that drives the panal and HV. Check to see if any fuses are blown, if the fuse is blown, you can try replacing it, but if it continues to pop, then the main fets that drive the HV are shot and will need to be replaced.
It is a rough gamble to speculate but if all you have on the PS +5v and +3.3v it's obviously toast.. It would help at this point to have an adjustable dc supply and scope now to trace yest the remainder of the set but for the cost of a good scope you could buy the Tv new... Just going to have to go with your instincts on this one. I could add that usually in lcd cases where the supply has failed it's simply isolated to the supply.
The Power Supply Board is listed below. Please note, there are 2 models with the same beginning number (PDP4294). Verify your model number before selecting the Power Supply Board as each board is different depending on the model number.