Good Sunday morning everyone.
I have the TV listed above in hand which was given to me for free after a lightning strike took it out along with several other items in a friends house. Upon plugging it in and pressing the power button, the startup tone plays followed by an immediate shutdown with the 6 blink error. I downloaded the service manual and 6 blinks = backlight issue. This seems logical since the backlights don't even flash when the TV attempts to power up.
Next step, removed the back and checked voltages. Main board is sending the POW-ON and BL-ON signals. Flashlight test shows the Sony Logo when It tries to start. Power Supply has 12V present but no 24V.
Removed supply from TV to bench test. Fed 3V from the standby pin into POW-ON and BL-ON (I had previously confirmed the main board was sending these signals so I assumed I would get the same result). Confirmed that the 24V rail does not come up even for a second. 12V rail is steady at 12.14V actual output. Main filter cap is steady at 392V when POW-ON is applied and is 165V without POW-ON.
I've attached pictures of just the power supply since I already have the problem narrowed down. I'm quite efficient at component level repair but haven't worked on this particular board. Replacements are scarce. I do see one person on Ebay offering repair service for $65 but I'd prefer to do it myself if possible. As always, any opinions are greatly appreciated.
Thanks in advance,
Aaron
I have the TV listed above in hand which was given to me for free after a lightning strike took it out along with several other items in a friends house. Upon plugging it in and pressing the power button, the startup tone plays followed by an immediate shutdown with the 6 blink error. I downloaded the service manual and 6 blinks = backlight issue. This seems logical since the backlights don't even flash when the TV attempts to power up.
Next step, removed the back and checked voltages. Main board is sending the POW-ON and BL-ON signals. Flashlight test shows the Sony Logo when It tries to start. Power Supply has 12V present but no 24V.
Removed supply from TV to bench test. Fed 3V from the standby pin into POW-ON and BL-ON (I had previously confirmed the main board was sending these signals so I assumed I would get the same result). Confirmed that the 24V rail does not come up even for a second. 12V rail is steady at 12.14V actual output. Main filter cap is steady at 392V when POW-ON is applied and is 165V without POW-ON.
I've attached pictures of just the power supply since I already have the problem narrowed down. I'm quite efficient at component level repair but haven't worked on this particular board. Replacements are scarce. I do see one person on Ebay offering repair service for $65 but I'd prefer to do it myself if possible. As always, any opinions are greatly appreciated.
Thanks in advance,
Aaron
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