Sony KDL-40SL140 2 blink code

[kevinm34232]

LED turns green momentarily, then gives 2 blink code. Service manual does include the blink codes for some reason but just talks about them.??

Googling it seems to indicate power supply problem. Before I get into checking voltages, has anyone had experience with this one?

First thing I noticed it has the AC-DET but that seems to be working fine. Thanks!

[kevinm34232]

Re: Sony KDL-40SL140 2 blink code

POWER_ON - Jumps to 3.3v momentarily then down to 0v.
AC_OFF_DET - 3.4V
STBY3.3V - 3.4V
UNREG_15V - 0V
REG12V - 1.1V

Does it look like 12V or 15V not working and shutting down PSU?

[tom66]

Re: Sony KDL-40SL140 2 blink code

Yes, they should come up when POWER ON changes. Try jumpering with 1k resistor to STBY3.4V without main board connected, if they come up the main board may be bad.

[kevinm34232]

Re: Sony KDL-40SL140 2 blink code

Nope they don't come up, power supply problem then? The only other thing I see is the 1.0V on INV_ERR when TV is switched on, dunno if that is normal.

[tom66]

Re: Sony KDL-40SL140 2 blink code

Quite possibly because the power supplies are not coming up the inverter control circuit isn't working. So hence INV ERR. I'd track down the power supply fault first.

[budm]

Re: Sony KDL-40SL140 2 blink code

Here is the training manual, 2 blinks = power supply problem.

[kevinm34232]

Re: Sony KDL-40SL140 2 blink code

Thanks Bud that is very helpful info. According to this:

2X Blink Pattern (Power Supply Failure)
The 2X Blink Pattern usually indicates a loss of the 12V secondary output
on the main power supply IC6100. This protection mode basically indicates
a general main power supply failure, which can be caused by one of the
following failures
• Defective Main Power Supply (IC6100)
o Loss of 12V
• Loss of POWER_ON signal (Main Microprocessor)
You can determine if one of the previously listed conditions exists by
measuring the 12V and listening for the relay click before the TV shuts
OFF. If the 12V is not present before shutdown then the IP5Z power supply
board is possibly defective. Perform the following checks to determine the
defective component.
2X Troubleshooting Procedure:
1) Listen for Relay Click.
a) Relay Click Heard. Go to Step 2
b) No Relay Click Heard. Go to Step 3
2) Check the condition of the 12V at CN6150/pin 11
a) No 12V replace IP5Z-Board
b) *Normal 12V Level replace BM5-Board
*Normal voltage Level - the voltage approaches 12V but does not exceed
before shut down.
3) Check for the presence of the POWER_ON voltage at CN6150/pin
1 after pressing the TV ON/OFF button.
a) No 3.3V POWER_ON voltage replace BM5-Board
Troubleshooting
b) 3.3V POWER_ON present replace IP5Z Board


There is no relay click heard, and 3.3V POWER_ON is present, so it should be the power supply board, more specifically the IC6100. Does that sound like I read that right?

[kevinm34232]

Re: Sony KDL-40SL140 2 blink code

Replaced power supply and that fixed TV. I'd like to try to troubleshoot the original one if anyone is up to it. So far I replaced IC6100 and waiting on part IC6200 which I think I damaged when I forgot and used cold ground to check VCC.

Service manual has a nice schematic of PS
http://elektrotanya.com/?q=showresul...oria=&kat2=all