Westinghouse VR-3710 stuck in standby

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

No voltage detected at the backlight headers at any time.

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

Bump. Have y'all deemed my case hopeless?

[dick_barton]

Re: Westinghouse VR-3710 stuck in standby

Without a voltage on SW pin CON2F then I think the backlights will never come on.
You could remove the SW wire from that connector and use a 1K resistor from 5V to SW pin (not wire) and see if they come on.

[dskall]

Re: Westinghouse VR-3710 stuck in standby

Well I have a tv with basically the same problem. No blon voltage. Maybe if I can fix mine I can help you.

[budm]

Re: Westinghouse VR-3710 stuck in standby

BTW, there are many 3-pin SMD regulator ICs on that main board, did you check the DCV of all 3 pins yet? Make sure to report the reading and the P/N as printed on the body of the IC.

https://www.badcaps.net/forum/attach...9&d=1487902188
I see five ICs.

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

Dick_barton, applying voltage to SW brings up the backlights. Thanks.

Testing ICs....

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

budm, here are my readings from absolute left to right with the connectors at the top, in DCV compared to ground at a power board screw.

3.27, 1.79, 0
1117B
18 2891

4.99, 3.29, 0
1117B
33 331Q

3.27, 1.25, 0
1117B
AD A21h

3.26, 1.88, .59
1117B
AD A21h

3.26, 1.25, 0
1117B
AD A21h

[budm]

Re: Westinghouse VR-3710 stuck in standby

They are fine. I do not have any other suggestion.
I wonder if the TV was hit by surge of some sort that took out the power supply and the main board. Nothing look burnt out on the main board?
Try disconnecting the T-CON to see what it will do?

[dick_barton]

Re: Westinghouse VR-3710 stuck in standby

Dick_barton, applying voltage to SW brings up the backlights. Thanks.

Testing ICs....

With the backlight on could you now see a picture or menu when selected?

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

Sorry, I should have mentioned that. No imagery was visible when the backlights are on. Just gray.

[dick_barton]

Re: Westinghouse VR-3710 stuck in standby

So can you see from the front that the backlights are on and have you tried selecting menu on the remote to see if you can spot the image. It could be that IPWM needs some volts to bring the backlight brightness level up.

[isherwood]

Re: Westinghouse VR-3710 stuck in standby

Yeah, I could see that both backlights came on, but no images appeared. I tried changing the source to trigger some text. Seems like it would've been visible even with weak backlight.