sony KD 55XF9005 service manual
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sony KD 55XF9005 service manual
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Sony Bravia red light flashing 4 times is an error code of a bad inverter board or faulty LD board. If any backlight on the inverter board fails to work, Sony TV displays 4 times blinking code.
checking the inverter board
Either the inverter board needs to be repaired or replaced. The same goes for the LD board.
Solutions:
Power reset & factory reset your Sony TV to check if it can solve the issue without any further troubleshooting methods.
If not, open the back panel of your TV. Check the inverter board if any backlight on the board has failed.
Also, check the inverter board wires. If you find any faults, repair the inverter board. If needed, replace the board.
If the LD board is bad, replace it with the help of experts.
When the Sony TV was 4 times blinking continues, the fault is in the motherboard. Check IC1509, Q1505. You may need the help of experts to identify the exact issue.