Sony XBR-75X940E intermittent 6 blinks error code

[Davi.p]

I donl not believe what i'm reading, this tech guy is a thief or incapable for me.. do not trust him much, ask him clearly if he registered the same behaviour of your whole tv, then you can start changing the board..

[Davi.p]

I do not believe what i'm reading, this tech guy is a thief or incapable for me.. do not trust him much, ask him clearly if he registered some behaviour like your whole tv, then you can start changing the board.. tell me which one is the board he claims is the culprit..

this case reminds me one big tv 65" from Panasonic i have fixed two years ago, the previous owner said it sometimes do not power on and flashes the spy led, then usually turned on after some attempts , one day suddenly turned off with led error code and did not turned on any more.. i taken it for free and repaired two damages on the power board, there was a shorted micro cap and a bad little smd power mosfet, after about 4-5 usages it showed the damn bad news of a failing edge backlight led strip... in conclusion i can trust that one of your power boards is defective (possible cause mains spike) and is probably the one attached to the led board (your last photo), but it really worth the board change.. your backlight system is more stable i think and do not have problems.. and a good tech can spot the fault on the board, yours is not a very good tech.. for me..

[tiki66]

I have removed the 3rd pin on the connector between the G75 and the main board on the G75 side. I attached it to a screw hole.

Not sure which one is the LD Board.

Thanks!

Ground that pin again. LD Board is the one in the middle with metal plate over it. It should have a green and a red diode on it. If it lights green, LEDs are ok, if it light red, one or more segments are bad.

Do the thing I also said:


Anyway, try grounding BL_ERR and it could solve your problems. It is pin #27 on CN1001 on LD board that you have to ground (that small flat cable that goes from MB to LD board)

That way you should "kill" both 4x error and 6x error. If the tv sometime starts without backlight, then it's a problem with power supply that feeds power to LD board.