Question about Sony KV-27S15 27" TV

2 Answers

Standby relay clicks on and off continusly. Tv won't turn on. I check my diode and transistor who control the standby relay and it is fine. I also replaced the flyback and I still in the same situation. What do you recommend to check next?

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  • gonzalez_m17 Mar 11, 2008

    Thank you very much for your advise but Can you tell me wich(number Q?) Line transistors do you want me to remove

  • gonzalez_m17 Mar 12, 2008

    Hi!

    After removing the Line transistor I measured it and reads Ok, but when I measured the board (between base and colector) reads no voltage. But standby relay keeps clicking on and off,



    Note: I'm working only with the main TV board outside, and I plug and unplug the main power cord. My TV'S control boards (for power, volume,channels) CRT, and spekers are still attached to the TV set. Do I need to put everything back togheter and try? I didn't do it because when I connect the main TV board by itself still clicking on and off anyways.



    What do you recommend to do next?

×

2 Answers

Hi there!
I do not have the specs on your TV but this is standard on all TVs. Only different numbers. The Line or Flyback transistor is located next to the Flyback Transformer, usually mounted on a Big Heatsink. When removed and measured you should read a short between Base and Emitter on the Transistor itself. This is an internal Diode on the Package. Now make sure not to short anything when switching the TV on without the Transistor and then measure your Voltage on the board where the Transistor had been removed( between Base and Collector) 145V. Good Luck,JUS004

Posted on Mar 11, 2008

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  • Expert
  • 135 Answers

Hi there!

You have an obvious error state on the unit. You may want to try and remove the Line Transistors to check for voltage first. In the region of 145V(between base and collector. If the set then stays in standby you may have a vertical error. Also check 5V rail to the processor and suspicious looking components like caps. Good Luck,JUS004

Posted on Mar 05, 2008

  • Justin Smith Mar 16, 2008

    Hi there!

    Seems like a tricky fault. Check all the caps in the power supply and any suspicious looking components and perhaps the relay itself, other than that you will have to refer to a repair technician with a circuit diagram and experience on this model. Sorry I cannot assist any further. Good Luck, JUS004

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Mrvica
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SOURCE: When I conect my TV, Standby relay clicks on and off continusly. Tv won't turn on

Hi,
Try to pull cable out! Turn on switch and power cable in and remote put away!
good luck

Posted on Feb 26, 2008

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