westinghouse dwm50f3g1 powers up with no picture

[engelwood39]

I have a westinghouse dwm50f3g1 that powers up and the back-light comes on but the picture never comes on. The screen just has a very dim dark glow.

Does anyone know what testing should be done or what might be at fault?

[dick_barton]

Re: westinghouse dwm50f3g1 powers up with no picture

Have you checked with a bright light on the screen if there is a picture. Do you have sound?

[Andrew F. Ali]

Re: westinghouse dwm50f3g1 powers up with no picture

OK so the backlights are ON and you have no picture....Look at the T-CON Bd and locate the SMD fuse....( I can't see it in the pictures).....see if there is 12Vdc on both sides of the Fuse. If 12Vdc is present on both sides...disconnect one side of the flat white cable going to the Panel and see if there is picture....reconnect and remove the other side....report what you see....of course disconnecting and reconnecting of the cables are done with the power OFF.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

No there is no picture with a flashlight. The back-light is lit up when the set is on.

Andrew, I am attaching a pic of what I believe may be the fuse It is green whit a "F102" marking next to it. If it is I have 11.73V on each side of it. Unplugging the ribbon cables and trying it with just one side hooked up still had no picture(I tried it on both sides).

Does the narrow it down to the just the T-Con Board? Or could it still possibly be the Main Board?

If you need a better pic up close of the possible fuse let me know.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

If I need to replace the T-Con Board it would be nice to know soon. I found one for pretty cheap and would like to buy soon if it

[CapLeaker]

Re: westinghouse dwm50f3g1 powers up with no picture

The only way to test the main board is to check the LVDS with an oscilloscope. Unless you have one to do so, the cheapest and next logical thing is to try the Tcon first.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

Sounds good CapLeaker. It has now been purchased and I will update when the part comes in.

If that doesn't work is the next logical step to replace the Main Board?

[budm]

Re: westinghouse dwm50f3g1 powers up with no picture

Westinghouse Element Seiki RCA 55.50T03.C05 / 55.50T03.C01 (T500HVN01.0, 50T03-C0A) T-Con Board
http://www.shopjimmy.com/westinghous...-con-board.htm
If you look real close at the board, you will see bare copper pad test points with label right next to them.
For example, there are two test points that I can see close to IC U206.
V3D3 = 3.3V
V1D2 = 1.2V
V????
You need to look through a bunch of them, I can only see so much using pictures because they are so small.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

Hey Budm,
Here are those voltages:

V3D3 = 3.226V
V1D2 = 1.209V
VGL c220R229 = -5.713V
C434 VOTP= 3.201V
WP0100=1.639
V12IN=0V

I am not sure what all you want me to to test? I don't see too many mor whith the (V#D#) format.

[budm]

Re: westinghouse dwm50f3g1 powers up with no picture

Are you able to find Vgh?
BTW 'V12IN=0V" That cannot be right, that's V input 12VDC feeding the fuse F102. It has to be measurement error.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

VGH= I can't find a Vgh. Does it for sure have that?
recheck on V12IN=11.28

also
VSS= -6.064
VCOM_A 0.477

[budm]

Re: westinghouse dwm50f3g1 powers up with no picture

VGH, VGL, and many other Voltages are needed.
https://www.badcaps.net/forum/showth...hlight=vgh+vgl

https://cdn.badcaps-static.com/pdfs/...2a9b4bc15d.pdf

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

Here is the board divided into 5 pictures under a magnifying glass.

They are sequential moving left to right on the board(inverted to read easier).

If you could let me know what values I need to get to you (and preferable what pic # they are in) that would be great. Thanks!

[Stan62]

Re: westinghouse dwm50f3g1 powers up with no picture

Hello, I'm new here. Please tell me How do you post a 'new' thread?

[budm]

Re: westinghouse dwm50f3g1 powers up with no picture

I believe the IC U209 AUO-P301-16 is the one that produces the VGH, VGL Voltages similar to the TI chip. I need find the spec sheet for to verify, so far I cannot locate the VGH point, it should be in that area.

http://wenku.baidu.com/view/72d64d2f...950e73832.html

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

Hello, I'm new here. Please tell me How do you post a 'new' thread?

Go to the forum you want to post in and click on the Forum Tools drop down on top right. Then choose start new thread.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

I believe the IC U209 AUO-P301-16 is the one that produces the VGH, VGL Voltages similar to the TI chip. I need find the spec sheet for to verify, so far I cannot locate the VGH point, it should be in that area.

http://wenku.baidu.com/view/72d64d2f...950e73832.html

Do you think it would be a good start to replace the T-Con board and see what happens since neither side of the screen works when I unplug a ribbon cable off of the T-Con board? Or if I replace both the T-con and Main board do you feel pretty good about it probably fixing the TV?

[budm]

Re: westinghouse dwm50f3g1 powers up with no picture

I would try new T-CON.

[engelwood39]

Re: westinghouse dwm50f3g1 powers up with no picture

It's ordered. I will get back to you.

[CapLeaker]

Re: westinghouse dwm50f3g1 powers up with no picture

Sounds good CapLeaker. It has now been purchased and I will update when the part comes in.

If that doesn't work is the next logical step to replace the Main Board?

For me it would be the oscilloscope. Problem is having one, or knowing someone that has one... other than that, it is changing the main board, hoping it isn't a bad panel.