Sony Grand WEGA KDF-55WF655 36" Rear Projection HDTV Logo
Posted on Aug 26, 2007
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55 in Sony KDF55WF655 Goes to standby and red light blinks 4 times

After turning on, TV powers up then goes to standby. The red light then blinks four times. The TV is a little less than 3 years old. This problem has gotten worse and now the TV will not operate. For the last two years the problem was intermitent and would be resolved by leaving TV for a few minutes. Any help appreciated.

  • zx12 guy Oct 10, 2007

    This did it. I replaced the H4 board, facing the TV on the lower right back, and it works now. Thanks for your help.

  • Anonymous Aug 16, 2008

    The picture shut off and there is a red light blinking after the green light light blinks

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  • Expert 140 Answers
  • Posted on Aug 26, 2007
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Check the thermal sensor fuse part# 1-910-023-93 or possibly one of the four fans. If the unit goes into Fan/Thermal Protect shutdown (4 blinks) it can be difficult to determine the cause since the unit turns off too quickly to troubleshoot. Solution: Ground the data line by inserting a jumper between pins 3 and 6 of CN44 on the H4 board. This overrides the protection circuits for troubleshooting. Do this right after turning the unit on and as soon as the lamp is seen lighting. Check pins 2, 5, 8, and 11 of CN6000 on the G2 board for less than 1VDC. Any voltage higher than that indicates a faulty fan. If all voltages are within specs, the H4 board must be replaced. If a fan is found defective, the optical block will need to be replaced if it is located inside the assembly. H4 Board Part Number: A1054674A Replace the following part based on which pin of CN6000 is out of specs: Pin 2: Fan 1 (part of optical block) Pin 5: Fan 2 178723211 Pin 8: Fan 3 178706511 Pin 11: Fan 4 178708111 Optical block Part Number: A1084662A

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