Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

[kevinm34232]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

I think I may know what's going on and I don't know why I didn't see this before but when hitting power button, when POWER ON goes high momentarily, BL-ERR is going to 3.3V as well, which would explain 5 blink code, not T-Con problem but a panel issue.

The thing is I've tested backlights with back light tester and can force PS on with POWER ON and BL-ON and seems normal.

[Andrew F. Ali]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

On e-bay there are 'used' Main Bd. (I checked) they are supposedly from TVs with broken screen. I buy ALL my boards off e-bay and have had no problems thus far. They are reasonably priced. Yes I do think it is a Main Bd. issue.

[kevinm34232]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

What about the BL-ERR?

[Andrew F. Ali]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Well the backlights came on and stayed on when you tested the PSU so I think a Main Bd will fix your TV.

[kevinm34232]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Where are you seeing used boards for this model?

On e-bay there are 'used' Main Bd. (I checked) they are supposedly from TVs with broken screen. I buy ALL my boards off e-bay and have had no problems thus far. They are reasonably priced. Yes I do think it is a Main Bd. issue.

[nomoresonys]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Ya not spending that much on an older 46", not worth it.. thanks for looking though..


Budm as for the PANEL ERR#:

On initial plug in to AC and/or each time power button is pressed, pin goes to 0.872V, then drops quickly back to 0V.

The same thing happens if I disconnect CN4002 (the other LVDS connector), or either one or both of the ribbons going to the panel.

With the T-Con completely disconnected from main board, PANEL ERR# goes to 3.3V immediately.

Not sure what to make of that voltage reading whether it should be low or high..

I tried grounding out the 3.3V PANEL ERR# pin with the T-Con disconnected, same 5 blinks.

I hear ya, I wouldn't pay half that for it.

[Andrew F. Ali]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

OK so this was the board I saw. I didn't realise till now the others I see are saying defective for 27.00USD

[kevinm34232]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Any clue what triggers the panel_err this is really I can find about this..

[budwich]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

you might check this thread AND the suggestion by davi.p

https://www.badcaps.net/forum/showth...t=69505&page=2

[kevinm34232]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Follow up on this one, got another main board and fixed it.

Neither the BL-ERR or PANEL-ERR voltages changed from before, so it was just a main board false error. Maybe EEPROM?

Toshiba TC58NVG2S3ETA10

Oh well giving up on this one, not worth the trouble..

[Andrew F. Ali]

Re: Sony KDL-46EX640 won't turn on, 5 blinks on standby light.

Thanks for the follow up. So it WAS a faulty Main Bd. after all.