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.

Did you look at the 'PANEL ERROR' pin?

Did you follow up on this to see if there is any voltage at that pin?? Of course this would be with everything connected.

[nomoresonys]

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

A schematic of the mainboard would help.

[nomoresonys]

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

Looks like you need to find out why there's no tcon on signal coming from mainboard, did you check everything on tcon with your meter?

[nomoresonys]

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

Faulty eeprom?

[Andrew F. Ali]

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

Your Main Bd. Nos. would be
1-895-172-11
(1P-011BJ00-4011)

[budm]

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

TV does not turn on and stay on. Instantly 5 blink code.

Did you look at the 'PANEL ERROR' pin?

[Andrew F. Ali]

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

OK. I am now thinking your Main Bd. is bad and you should look for a replacement board. I think.

[kevinm34232]

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

TV does not turn on and stay on. Instantly 5 blink code.

[Andrew F. Ali]

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

So what do we have on a recap:
1. TV switching on and staying on
2. Backlight turn on and stay on
3. All signals from the Main Bd. and voltages on PSU are present, except
4. T-CON ON signal from Main Bd.

If you connect the 3.3V to the T-CON ON wire on the PSU you would have to make sure and disconnect it from the Main Bd. You would have to cut to wire midway of the connectors to leave enough space to join it back up.
Just leave it connected long enough to see if there is an image on the Screen/Panel.
If you get an image, then the Main Bd. is faulty.

[budm]

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

Service manual on post #2, if you look at PDF page 30 LVDS connector, there is pin called 'PANEL ERROR' pin.
Your panel is Samsung so SLCD looks to be the one for your TV, you can verify the pin out.

[nomoresonys]

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

Did not try yet, will try shortly. It's questionable if it will accept the USB drive without being able to power up.

update:

TV will not take firmware file automatically...

.

[kevinm34232]

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

Just to confirm, same 5 blinks with 2 ribbon cables from T-Con to panel disconnected.

Correct I did disconnect those ribbons,I just need to make sure that when I did that, I had the LVDS cables reconnected which I'm pretty sure I did but I will recheck.

[kevinm34232]

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

So did you try the firmware apply?

Did not try yet, will try shortly. It's questionable if it will accept the USB drive without being able to power up.

update:

TV will not take firmware file automatically...

[kevinm34232]

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

I'd like to figure out what T-Con ON error is looking for. There doesn't appear to be any short so not sure what the 5 blinks is all about.

My guess is main board giving false error, but that's why I'm asking the experts..

Do you guys think it's a good idea to send 3.3V to T-Con ON, while connected to main board to see if TV will turn on?

[Andrew F. Ali]

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

T

[nomoresonys]

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

http://www.ustvparts.com/apps/websto...s/show/3939160 Appears to be a match but triple check if you get it.

[Andrew F. Ali]

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

Panel # LTY460HJ07 A02/ LJ96-05959A

T-Con: Sony LJ94-24765D

Same Panel and T-CON Nos. I repaired. The T-CON is about 40.00 USD. I bought a T-CON Bd. off e-bay as I thought the Level Shifter IC was causing the double image. I eventually cut-off the CKPV1,2&3 and STVP signals with some stationery tape to cure the double image issue. So I have a good T-CON Bd. now.

[nomoresonys]

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

So did you try the firmware apply?

[kevinm34232]

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

Panel # LTY460HJ07 A02/ LJ96-05959A

T-Con: Sony LJ94-24765D

[kevinm34232]

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

I only tried this with the main board disconnected to make sure the power board was good. I had backlights and all voltages.

So if you leave the T-CON force on in place, you still get 5 blink codes?