Question about Toshiba 27A51 27" TV

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Will not power up

When I plug in the power, I hear the high-pitched whine of the HF unit, but at the same time a repeated click (once every 3 seconds) of a relay.  The unit remains black, no sound (other than click and soft HF whine).

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Re: will not power up

Your problem is in flyback or high voltage section failure.

  • check horizontal output transistor
  • check fly back transformer.
  • check for supply to horizontal section as high voltage from power supply may create such problem
  • as this failure is due high voltage section so it is better to take skilled technician help.
  • good luck.

Posted on Oct 15, 2007

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2 Answers

My hlt4675sx/xaa won't power up. The Stand by/ temp light and the lamp light flash. The bulb id brand new.

First thing to do is look from back of set or area when lamp is: do you see the lamp come on for even a few seconds?

Also is the problem the exact same as before lamp Replaced?

Before set failed did you hear unusual fan like, high pitched whine or even grinding sound?

Depending on how you answer I will assist you.


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Ur flyback transformer it have cold soldier or is dead.U also could have prob. with ur power ic inverter board too.

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It looks like the squeal or high pitch is produced by the flyback part # 257805. Also check the the secondary side of the power supply for around 130VDC if that voltage is found to be lower than 120VDC I would suggest to replace CP80 with a 100 mfd@250 vdc. Part # 218374 has these parts, for the flyback transformer just type in search for FLY-391, this one is cheaper than the genuine(257805) fly back.
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sounds like the Power Transformer to me,  usually accompanied by a high pitch (almost inaudiable whine) and  sparks arcing.


This needs a professional repair..



Oct 11, 2007 | RCA F27252GY 27" TV

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You have a problem is in your horizontal section which also is part of your power supply. The high pitched whine is from the Intergrated High voltage transformer (also called the flyback transformer). This sound occurs when the freuency of the transformer changes and or the voltage gets too high. The click occurs as a result of the drawing of excessive current by the HOT Horizontal output transistor. This is repairable, but requires the correct equipment and a schematic.

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A high pitched whine is most of the time the power supply trying to run, but it is being loaded down from a short somewheres in the set. Sometimes a resistor on the CRT board will open and make the set shut down right after start up, sometimes the horizontal output transistor causes this problem, almost any circuit for that matter can cause this problem. Good Luck

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