JVC LT-39M440
main board M55 / A50469 / 14
SPI G25Q64
PSU: P5150_TV4205-ZC02-01
I received a problem in my shop that does not turn on. Diagnostics revealed that there is no +5 volts stby
In the power supply on stby there is a PWM OB2273, did not show signs of work. Changed, the result is 0. i m Shook because everything looks good but no luck , rang it, replaced the harness ... It turned out that the PWM output was output to the emitter repeater, which is used to build up the signal when controlling the logic Mosfet. ??? Scheme attached such inclusion.
The transistors in the repeater called as good. I threw them (Q105, 101), put the jumper directly on the gate of the transistor, and the power supply worked.
THIS IS FINAL RESULT WHEN MARKS 2 POINT ARE SHORT
main board M55 / A50469 / 14
SPI G25Q64
PSU: P5150_TV4205-ZC02-01
I received a problem in my shop that does not turn on. Diagnostics revealed that there is no +5 volts stby
In the power supply on stby there is a PWM OB2273, did not show signs of work. Changed, the result is 0. i m Shook because everything looks good but no luck , rang it, replaced the harness ... It turned out that the PWM output was output to the emitter repeater, which is used to build up the signal when controlling the logic Mosfet. ??? Scheme attached such inclusion.
The transistors in the repeater called as good. I threw them (Q105, 101), put the jumper directly on the gate of the transistor, and the power supply worked.
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