I was using this TV for 5 years before it stopped working. I like this TV and would love to fix it myself.*
When I press the power button, the white led comes on (sony calls the module smart core) and then it switches over to 5 red blinks. No screen, no backlight, no relay click, nothing. I have disassembled the tv and found the service manual for 75x940e online. The manual suggests a faulty power board, TCON or the panel.**
The standby pin is at 3.3V. Fuses on the mainboard and TCON are fine. Caps on TCON also seem to be fine. When I turn on the tv the white led comes on and REG_12V pin on power board measures 12.8V, VDDB_3.3V pad on TCON measures 0.577V. When it switches over to 5 blinking reds, the voltage on REG_12V and VDDB drops to 0.**
I also disconnected the power board and shorted standby pin to POWER_ON and TCON_ON. Both measure 12.8V. Power board seems to be fine.
I disconnected the ribbons going out of TCON to the buffers and then turned on the tv. I still get 5 blinks.
What should I do next to narrow down the problem, any advice is welcome. Thanks!
When I press the power button, the white led comes on (sony calls the module smart core) and then it switches over to 5 red blinks. No screen, no backlight, no relay click, nothing. I have disassembled the tv and found the service manual for 75x940e online. The manual suggests a faulty power board, TCON or the panel.**
The standby pin is at 3.3V. Fuses on the mainboard and TCON are fine. Caps on TCON also seem to be fine. When I turn on the tv the white led comes on and REG_12V pin on power board measures 12.8V, VDDB_3.3V pad on TCON measures 0.577V. When it switches over to 5 blinking reds, the voltage on REG_12V and VDDB drops to 0.**
I also disconnected the power board and shorted standby pin to POWER_ON and TCON_ON. Both measure 12.8V. Power board seems to be fine.
I disconnected the ribbons going out of TCON to the buffers and then turned on the tv. I still get 5 blinks.
What should I do next to narrow down the problem, any advice is welcome. Thanks!
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