Question about Sony KV-27S15 27" TV

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When I conect my TV, 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 replace the flyback and I still in the same situation. What do you recommend to check next?

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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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SOURCE: Standby relay clicks on and off

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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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....


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

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This is like a car running without a driver,the horizonatl output transistor has the voltage it needs but it does not have horizontal drive signal applied to the base of the horizonatl driver transistor,the driver transistor should have a signal coming from the signal processor where the signal is generated just to get give it to the driver this driver then it gives it to the output to energize the flyback and light up the picture tube and generate a few other supplies,158 volts are there because the output is not turn on,try measuring voltage somewere else in the set and not at the collector of the output,there is a b+supply that goes to the signal processor(8 to 12 volts),check to see if you have this voltage,I couldn't tell you the pins in the siganl processor IC without squematic,It seems you know your way around tv service but be careful when checking voltages.Let Us know if you need more information.

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