Replace the main board. You can get the replacement main board from www.tvcircuitboards most likley if they dont have it listed I would send a email as they only list boards that they have more than one of single boards are not always listed.
SOURCE: Mono Vs Stereo
Here is what I found out. I had this same problem. I have cable TV and the signal coming into my house was not very strong. They 'boosted' the signal and this problem stopped. Along the way, they tested that the cable line had been passing through a splitter, so that to the house the signal was good, but by the time it passed all of the splitters, the signal was not strong enough. Now all is well and the problem does not happen anymore.
SOURCE: Akai pdp4273m1 has sound but no picture
I also have the akai PDP4273M1 tv with power and no picture and I looked at the power supply board inside and found 1 of the FMG26S chips blown and I am looking into replacing this to see if that does it and if not do a search for SANKEN PSC10165B M and for approx 170.00 you can get a whole new power supply for it and its easy to put in..
SOURCE: MY AKAI LCT3201AD TURNS OFF BY ITSELF
If you are electronically inclined, replace the three 1000uf 16v electrolytic capacitors in the power supply board located above the power switch. They are likely bulging out at the top and failed. They are the three in a row at the top - center of the board, located between the two black heat sinks. Make sure you get caps rated for 105c degrees! I recommend replacing them with 1000uf 25v caps. 35v caps will work but might be a tight fit as they are larger diameter.
Should cost you about $8 for the parts shipped. You can get them from partsexpress or digikey or any good local electronics store. Your local radio shack may have them but they won'y be 105c and thus may not last long.
Not handy, ask around, there is usually some electronic tweaker guy around that will install them for a few bucks.
This has solved the turns on / then off problem every time in the 3 I've done.
SOURCE: AKAI LCT3201AD Tv will not
I have just repaired one of these sets for the 2nd time. The problem is definitely the Capacitors on the Main Power Supply Board. If you are handy, you could replace them yourself, or You can send your board to me and I will make the repair for you. Akai initially used what I feel are sub-standard Capacitors on these boards, and I have found that by replacing most of them, this problem can be eliminated. My email address for repairs is [email protected]
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