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

[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.

[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..

[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.

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

[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

[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.

[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.

[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.

What about the BL-ERR?

[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.

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.

[budm]

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

Well at least you did try to trick the ERROR pin signal but still get the same 5-error code. I am not sure at this point if you have T-CON or main board problem.

[kevinm34232]

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.

[nomoresonys]

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

Ebay Hong Kong 110 U.S plus 10 shipping, might need to translate page, your right sold out about everywhere, saw one for 192 bucks but that's sick.

[nomoresonys]

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

I had no luck when I searched for a main board the other day, it's gonna be one of those hard to find ones..

But first let's determine if it's that board for sure.

If I recall, the 40, 46 and 55 ex640 will all work.

[kevinm34232]

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

I had no luck when I searched for a main board the other day, it's gonna be one of those hard to find ones..

But first let's determine if it's that board for sure.

[nomoresonys]

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

http://assets.shopjimmy.com/media/ca...M/IMG_1134.JPG pic. of mainboard.

[nomoresonys]

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

Page 13 in budm's service manual looks good, maybe you can trace the tcon on wire back to mainboard then follow the traces to where they go, did you check those two IC voltage regulators right by the connector and any fuses you might have?

[kevinm34232]

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

Did you look at the 'PANEL ERROR' pin?

I will check the that pin when I get home and follow up thank you..

[budm]

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

Sorry about the schematic for the main board, this is the one I am referring to: