Question about Standard (CRT) Televisions

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LG CRT HDTV Dead no picture

LG model:RU-30FZ13 chassis: MC021B
No picture and no sound, standby light on.
TV turn on, I ear relay click, power supply smps turn on, 135 volts B+, 3 secondes later, supply turn off.
Checked solders on PCB, Good!
Standby supply, Good!
No short on smps, no short on HV circuit.
I raised the control line ON/OFF from microprocessor IC01, power supply turn on and stay on, all supply voltage Good!
I suspect the microprocessor (50$), but not sure.

Posted by on

  • Cailloux Aug 06, 2008

    I forgot to say, I remove the Horizontal Output Transistor during my test.
    If there is no vertical or no horizontal feedback pulse to the microprocessor, does it shutdown the power supply???

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  • 125 Answers

If you have the b + acording the manual then you loose it
could be many things like the vert. circuit, the crt itself or
the flyback,

Posted on Aug 06, 2008

  • Jose Posada
    Jose Posada Aug 06, 2008

    I am assuming you have a smps power supply, I do not have the manual. smps p/s stay working if you disconnect the horizontal or the vertical,they are self regulated power supplies

    if you get shutdown could be the power itself

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