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I assume the full model number is KDL-60EX645. According to Sony service information the 6 blink code means inverter malfunction, this can be caused by 3 things, power board issues (inverter section), main board issues (missing BL_ON command) or failed backlights. On most brands backlight failure is common but not as much with Sony however I still think this may be the issue, I'd start by testing each of the inverter output lines, nominal voltage according to service info is 120 to 125 VDC per string, if you don't see the correct voltages, test from + side and use frame as ground, if you see voltage then the inverter is working and the over current or voltage is shutting down the inverter and backlights are bad. The backlight on command is 3.4 VDC, that could be tested as well but I don't think it's a main board issue.
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Refer to Sony KDL 55EX500 Troubleshooting Manual Protection Mode Symptom... 5X Blink - TCON & HFR Failure The 5X blink protection mode indicates a communications error between the TCON/HFR board and the MT5388 microprocessor on the A-Board.
First replace the TCON/HFR Board if the 5X protection mode blink pattern occurs. If the TCON/HFR Board does not repair the problem then replace the A-Board.
Mar 28, 2015 - Uploaded by Tampatec
Sony Bravia LCD TV KDL models red blinking led light error codes & possible ... with perfect picture, no warning signs and it just shuts off. is it that quick? ... with the following problem: I connect the power grid lights Standby red light. ... the title before deleting, it is very fast after that flashes Standby 6 times.Missing: 46w3000 30
there is a back light problem the connectors of back light are loosing so please go to your nearest Sony service center & solve the problem but if you know about led so remove the o cell & clean the connectors but if you are end user please don't open the led because the panel is thin
Bus clock and/or data lines low at power on. 6 blinks of standby light denotes this. Actually, it should be a motherboard problem. Your TV need a thorough checkup before confirmation. If you wish to get more details about the blinking codes to Sony TVs, check this link.
14 blinks to Sony Brand LCDs indicates a 'Backend error'. It means that, the main board to this TV should be checked for fault. In most cases the main board might need replacement, and a software update too. If you wish to know more details about this blinking code, check this link. It has details of blinking codes to several brands of TVs including Sony. Actually the work is a skilled one, need experience.