Question about Akai LCT2070 20 in. EDTV-Ready LCD Television

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Tv turns on and briefly displays picture and then goes black, still has sound. Sometimes you can turn it on and off several times and the picture might stay on the screen.

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  • bloodthinner Apr 27, 2008

    picture is only seen for the words akai and then thats it and it is faint. opened the tv up(which was a real chore) and couldn't see anything that looks bad but i dont know what the inverter board looks like.

  • pproctor Jan 08, 2009

    Im trying to figure out how to get into this thing. The service manual is less than forth comming on the secret...

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I have a similar condition; the TV powers on fine and displays "Akai," but then goes dark. I can see the letters and shapes the TV puts out using a flashlight, so all of the control electronics are working fine.

A multimeter shows the power supply putting out a steady 12.7 volts.

The capacitors described above are always a good place to check; however, my TV doesn't have a problem there.

Here is a third option. The inverter board (a Greatboard model of some sophistication) will produce an overcurrent signal on pin 7 of the connector if one of the tubes draws too much or too little current. This prevents a cascading failure should one fail. The problem with this is that complete dissassembly is required to access the bulbs. My boss and I estimate that this set has about 3000 hours on it and the endings on the fluorescent bulbs have blackish rings at the ends. (There are 3 bulbs along both the top and bottom each fed from the inverter board.) I haven't in my brief Googlings found replacement builbs, but IF the inverter is good and IF the rest of the machine has enough life left in it and IF you get it all back together properly, it would probably extend the set's life.

Replacing the inverter board might work if it's actually the problem, but having seen the bulbs I'm not about to hunt a spare inverter down.

pproctor:
Four screws hold on the base, four the backside, and one a small piece of the backside. Then it's just snap joints to get that off. After that, the metal shield is held on by eight screws AND the two anchors for the VGA port. Past that is a royal pain; good luck with it. Just look for all the screws and understand light gates and light balancing and lorentz lenses...well, just how to put them back together like they were. ;) (I just finished complete disassembly and reassembly and it was UGLY.)

73's,
jkunkee

Posted on Jan 14, 2010

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I had the same exact problem. It is not internal..so please don't mess with the insides. It is your power supply. It puts off low voltage. You need to find a replacement and your tv will work just fine.

Posted on Mar 07, 2009

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I am almost certain that the fault lies on the inverter board,there is a capacitor that is failing and needs replacing,it is normally black or brown and is near the plug on the inverter board,try heating the inverter board up with a hair dryer when the set is cold and it should come straight on,if it does then you know where the fault is,also check the small white fuse(maybe on the underside of the board)hasn't gone open circuit,if it has repace and carry on enjoying your tv.

Posted on Apr 20, 2008

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