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Sony A90J red light blinking 5 times?

I received an A90J "65 that doesn't turn on or show any LED indication at all. I have an identical one that works though, so I swapped the main board, t-con, and power supply from the working one to the dead one. When I try to turn it on, the LED blinks 5 times (and the display never turns on). I've heard that this is most likely a "bad" panel then. What does "bad" specifically mean in this context that it would be detectable by the boards and thus throw up an error code? Would it be fixable?

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@vywsss bad panel really means bad LCD driver boards. Those are the long skinny boards that are the first ones that are connected to the LCD panel. They use some ribbon cables that are connected via a special bonding procedure. These boards are not replaceable by the DIY'er or even most pro's due to the way they are constructed.

The 5 blink code of this model is caused by:

Panel ID EEPROM I2C No ACK

(Also panel power failure is a suspect) [P_ID_ERR]

Data corruption in EEPROM[P_ID_ERR]

and referring to the Triage chart for this model the T-con module is considered the primary suspect followed by the panel.

If you still have the back cover open, takes some good pictures of your boards and the interconnect cables. Post those with your Question. That way we can see what you see.

If it is your panel, you can try a Tape-Off. Essentially that means you isolate some of the data lines on the ribbon cables going to the driver boards. There are plenty of videos on YT that will tell you how to proceed.

Repair is War on Entropy!

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@oldturkey03 Thanks! Unfortunately, this is an OLED tv so I’m not sure how much of that would apply here. Do OLED’s also have a driver board that might be the culprit?

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@vywsss you are 100% right. Revised my answer to reflect my oversight :-)

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@oldturkey03 Added photos to my question. I might just try going for a new t-con board just in case it works. Are they replaceable on the A90J? I've heard they may be a software lock or something between the original panel and t-con.

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vywsss zal eeuwig dankbaar zijn.
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