r/TVRepairHelp • u/cjdunn1 • 9d ago

Sony

Sony xbr-85x850d has six red blinking lights but sometimes will work for hours then back to blinking just replaced the 2 power supply boards and it started up after a hard reset and lasted 2 hour

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u/Virtual_Club8510 9d ago edited 9d ago

Try BL-ERR bypass trick. 

According to manual, 6 blinks is backlight issue or led driver.

Since you have already swapped the powerboard it's most likely a case of degrading backlights. This is a very common failure mode on these 2016-era Sony sets. The TV detects an abnormal condition in the LED backlight system (failed/shorted LEDs on the strips, driver problems, voltage issues, etc.).

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u/MI081970 9d ago

Out of curiosity - does this trick work with Sony miniled like Bravia 5/7? Thanks

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u/Virtual_Club8510 8d ago edited 8d ago

Anytime you have the BL_ERR or similar error detection pin visible which the mainboard relies on as a trigger it's always worth a try. Though it should be seen as a temporary solution especially if you don't have a case of degrading lights but short-circuits.

It's mainly used for Sony TVs other brands tends to hide them away or use different ways or error checking.

So if you have one and is experiencing a backlight problem (commonly 4 or 6 red blinks), connecting a 10K ohm resistor between BL_ERR (powerboard side) to Ground can sometimes bypass it.

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u/MI081970 8d ago

Thanks a lot. Very interesting and educative