Sony KDL-40W2000 3 LED Blnks Error

[StephenU]

Hi all looking for some help on repairing this old TV for a friend in work. Its a Sony KDL-40W2000 (Old LCD TV).
Any Help Guidance would be much appreciated.

TV has the LED error code 3 -
UNREG10.5V, PANEL5V Voltage Trouble (DCALERT1).

When power is applied and the power switch on tv is pressed you can hear the relay switching the LED goes from RED to Green for a brief couple of seconds then it goes into the flashing Red LED state. (3 blinks pause 3 blinks pause and so on.) On doing some reading up I've found:

"" Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault.

This is also a problem in the power supply circuit, check T603 and R672. (I cannot find these parts on the schematics at all most parts have the letter of the component and then 4 numbers.) ""

I have attached a pic of connector CN6200 as I took some measurements from it but no voltages were present with the connector seated or unseated.
Some pics are attached and I hope to get back to this tonight to get more pics and measurements

I also found this thread: https://www.badcaps.net/forum/showth...hlight=40w2000

Thanks in advance.

S.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Not even standby voltage, powerboard issue, you need at least the standby voltage to get started, check the fuse on powerboard if you didn't already.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Try with tv unplugged from power, unplug everything from powerboard, plug power cord into outlet, so only thing you are powering up is the powerboard, see if you have the standby voltage.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

https://www.ebay.co.uk/itm/PSU-1-871...EAAOSwze9c0uRn

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Are you sure you have the right schematics?

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

https://www.ebay.co.uk/itm/PSU-1-871...EAAOSwze9c0uRn

Watching this at the minute but would rather try do some debug on it to narrow it down to components rather than just swap out complete board if I can.

Thanks for the reply nomoresonys

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

Yes i'm pretty sure they are the correct schematics, they came from here >>

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

Not even standby voltage, powerboard issue, you need at least the standby voltage to get started, check the fuse on powerboard if you didn't already.

Gettting ~240v on both sides of the fuse - What i don't get is I get nothing on the standby 3v3 pin and i have a Red standby LED then goes to green when powered then, when failure occurs and 3 blinks code appears. I monitored pin 5 STBY+3.3V (CN6200) when on standby, green light and when 3 blink error is repeating, still nothing. DMM set too Auto range on VDC = 0.00v

Try with tv unplugged from power, unplug everything from powerboard, plug power cord into outlet, so only thing you are powering up is the powerboard, see if you have the standby voltage.

Will redo everything tonight again - if I can eliminate one board from another I will let him know what the price is with a board swap, just trying to keep the price down and get the TV back to him

Thanks

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

I see, something is amiss, can you try your meter on something else, to verify it's working correctly?

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

I see, something is amiss, can you try your meter on something else, to verify it's working correctly?

Its seeing the 240v input at both sides of the fuse when metered and on AC then switch to DC to take readings from connector but no voltage coming from pins.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Ok, guess the first thing you need to do is get the standby circuit working. As a test try heating the powerboard with a hairdryer be sure to heat the capacitors on there too, see if tv comes on or anything changes.

[Diah]

Re: Sony KDL-40W2000 3 LED Blnks Error

Its seeing the 240v input at both sides of the fuse when metered and on AC then switch to DC to take readings from connector but no voltage coming from pins.

did you inspect the back side of the PSU of crack soldering point?
could you listed the voltage you have on all legs of IC6100. be sure the black probe on HOT area chassis

[R_J]

Re: Sony KDL-40W2000 3 LED Blnks Error

If you are getting the led on the front of the tv and you here the relay click when you press the power button, you MUST have STBY3.3V. Check for the STBY on L6300 It will be there.

This is also a problem in the power supply circuit, check T603 and R672. (I cannot find these parts on the schematics at all most parts have the letter of the component and then 4 numbers.) ""

If you had an older SONY CRT you WOULD find these parts. This has NOTHING to do with this LCD tv. got to love the internet

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

If you are getting the led on the front of the tv and you here the relay click when you press the power button, you MUST have STBY3.3V. Check for the STBY on L6300 It will be there.

If you had an older SONY CRT you WOULD find these parts. This has NOTHING to do with this LCD tv. got to love the internet

+1, no way you can have blinking LED if the STBY 3.3V is not present.

[R_J]

Re: Sony KDL-40W2000 3 LED Blnks Error

There may be a problem with the panel, check if you have +5v on the t-con, Also disconnect the lvds cable between the t-con and the main and see if you get the same error.

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

Service manual:
https://www.manualslib.com/download/...l-40w2000.html
Error code 3-blink:
3 ) UNREG10.5V, PANEL5V Voltage Trouble (DCALERT
So perform test as RJ suggested.

[Diah]

Re: Sony KDL-40W2000 3 LED Blnks Error

wrong
3 error blink very wide at Sony platform not all listed on service manual are the case.. when 3.3V went grounded via IC6100 there other line continue feed the set to register error. this is from experience not SM.

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

Which board and at what page of the service manual IC6100 located?

[Diah]

Re: Sony KDL-40W2000 3 LED Blnks Error

look on the photo OP posted PSU 18 legs IC

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

SM manual page 60.
So how does 3,3V STBY is grounded via IC6100? So you are saying the SMPS IC6100 (for the +18v, +15v, +10.5V, and +33V) is bad?
I do not see STBY 3.3V feed the IC6100 which is in the HOT side.