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MODEL LCT2701TD SERIAL 501600648 Need new power board. Power light blinks repeatedly red instead of a constant red.

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  • billymack50 Jan 03, 2011

    After removing back of tv I see one main board located in top right quadrant. Is this board the one to be replaced? Or are the filtering capacitors replaced individually?

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Hi.

Even if PSU is a very common failure on this model, the light blinking does not necessary means that the faulty part is the power board. The power board is simply a common fault.
The light is telling you that TV is in a forced stand-by state called protection. Protect mode starts when the main controlled board detects a wrong voltage or a short.
The main controller board switches off all voltages apart the +5VDC from PSU, used to keep standby mode.
The TV PSU supplies different voltages in different separate lines(+24V, +15V, +12V, +5V, +3.3v). The voltages are switched on and off powering low voltage control lines (this direct to FET switches that turn on the main voltage lines)


When TV is in protect mode, testing on PSU is done by jumping the control lines with the low DC line with same voltage. Each time the tech jumps a line, a determined voltage can be activated and tested. This job is done with all voltages, if PSU is OK, then the tech will follow line to inverter or to T-Con board. After testing PSU and boards, if no problem is found, more testing gets done (cold solder joints, diag points, etc.). Here a broad description of how to carry typical LCD TV testing: Before proceeding I assume you have technical training and a multimeter...

If you have already purchased the PSU, go on with replacement. PSU is a common fault, and if you are lucky enough, that will do the job. Let say that replacing the PSU without testing you have about 80% chance that PSU is the problem.

If you do not have the spare part, DO NOT REPLACE capacitors unless the PSU testing reveals a fault, or unless the capacitors are obviously bad (bulged, burnt and leaking, or bad at cap tester). Otherwise you risk to de-solder caps from a good PSU board.
Bad capacitors are often swollen and bulged.

Capacitors can store charge even when the power cord is not connected. They must be discharged by shorting their contacts or you risk getting electrical discharge that is dangerous for yourself and can damage your equipment.

The PSU board is located behind the TV back cover, and is the board connecting to power cord.

Here PSU and PSU repair service:


AKAI LCT2701TD POWER SUPPLY MLT168A

Akai LCT2701TD Power Supply REPAIR SERVICE MLT168A

MLT168A Power Supply

See also this Fixya thread, problem was not capacitors :AKAI MLT168A Power Supply - FixYa

Posted on Jan 03, 2011

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The blinking light signals that the power source is in protected mode because there's a short on one of its output rails. This might have been caused by a failure of some components of the power source (it tv's that old it's almost always the filtering capacitors) or another board has failed and it has acted as a short - in that case it's most likely the inverter board. So before replacing boards you must make sure you are replacing the correct one - open the tv, look at the boards and test the voltages.
If you are sure the power board is faulty then you will have a problem: you won't fine a new one anywhere, Akai sells them only to their authorized repair shops. You have 2 options:
1 - you search for a used one, retrieved from cannibalized sets, in online sites like Ebay and Craigslist, or at repair shops.
2 - you get your present board refurbished at a site like
http://www.tvboardsbank.com/

Posted on Jan 02, 2011

  • Azrael SRL Jan 03, 2011

    The power board is the one with the big transformer and a lot of big capacitors on it.
    Of course the capacitors can be replaced individually - it's the first thing you should try. It will be way cheaper than replacing the entire board. A good video tutorial on how to do that can be seen here
    http://www.youtube.com/watch?v=YCSNWi3UH...

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