Question about Akai LCT2662 Television

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LCT2662 - No power

Hello. I was just wondering if you have came across any of this units that have no power as a result of short on the A/D Board? I have had two of these units now. I sucessfully rebuild the power supplies only to run in to the short on the 5VDC standby. With the power supply switch on, it will only read 1.8 to 2VDC. If I unplug the connector to the main board, it will give the expected 5VDC. I have tried to trace the short down with no luck. Any help would be greatly appreciated. Thanks in advance.

Retrohack

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  • Jerry Coleman
    Jerry Coleman Apr 03, 2008

    I know the supplies that I rebuilt are good...I tried them in another LCT2662 I have that is working. I was guessing it was one of the voltage reg. ics on the main board, but no luck so far. Just thought someone else might have ran across this problem. Thanks for the quick response....



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If it is a "low ohm" VCC to GND short. Measure caps looking for the lowest reading...may be just a little difference, but the closer you are to the short the lower the reading will be. You can also try hooking up your meter, one with 5 digit readout works best, to VCC and GND. Try to do it somewhere away from your lowest reading, and use a can of freeze spray to spray individual components. If you "hit" the shorted part the reading will fluctuate. You can test this by spraying the leads. Then you can also try the same set-up with hot air.
Good Luck,
Sam

Posted on Apr 04, 2008

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I have not seen a supply problem that after replacing the caps found something loading down the 5v line. Guess it's time to get out the scope and trace. :)
Good Luck
Bill

Posted on Apr 03, 2008

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Power supply most likely... It's a common problem with this particular model and we've seen quite a number of them for exactly what you're describing.
You need to replace 19 caps in the power supply 4) 3300uf/35v, 8) 2200uf/25v, 6) 1000uf/10v, 1) 1000uf/16v and you can go a little higher in the voltage of each cap for greater reliability.
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1 Blink SOS: This shutdown operation may be caused by the improper connection of a SS board connector to the panel.
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I just got done fixing an Akai LCT2660 that had four bad capacitors on the power board.Works perfect now.Hope this helps.Thank You very much!

Tyler

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