Ltv-32w6 Backlights no picture

[lilmonk3]

Grab this at E-waste the other day.. Its a Ltv-32w4 .. Powers up and stays powered up.. Screen glows dark blue/black, has sound but no picture. Here are the following readings I have taken with AC power connected
CN2003
Black 4.2 mV
White 0
Grey 0
Purple 16.5 mV
Blue 16.5 mV
Green 16.5 mV
Yellow 5.02 V
Orange 0
Red 0
Brown 16.5 mV
Black 16.4 mV
CN2002
All zeros
CN2001
Black 15.7 mV
Brown 15.7 mV
Red 1.8 mV
Orange 1.9 mV
Yellow 5.0V
Green 15.6 mV
Blue 15.5 mV
Purple 15.6 mV
Grey 1.6 mV
White 1.7 mV
Black 3.8 mV

Whats your thoughts on which board is the problem

[tom66]

Re: Ltv-32w6 Backlights no picture

Is it a Westinghouse?

Check the fuse on the T-con board.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Yes westinghouse.. I just edited the titile

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

F1 fuse marked with UD on Tcon reads 00.3.

[tom66]

Re: Ltv-32w6 Backlights no picture

Check both ends of the fuse for 5V or 12V, relative to the metal frame of the TV.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Tom this board is buried so I pulled it out to test it.. Can I test out of the TV? And what setting do you want me to use to test? But I can reinstall and squeeze in there to test

[budm]

Re: Ltv-32w6 Backlights no picture

Can we see the whole picture of the board as shown in post1, both sides of the board? The picture
The voltage readings do not look right.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Power board..

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Main Board

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

This is a Ltv-32w4 not Ltv-32w6

[budm]

Re: Ltv-32w6 Backlights no picture

So it does not have backlights, right?

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Yes has backlights.. Power on and stays on, the screen glows a dark bluish and has sound.. Will not show menu or any image.. Also I was just checking some of the zenner diodes on the back side of the power board and found some reading both ways..
D1017 .039v-.039v
D1016 Same as 1017
D1019 .523v-.736v

All the others read OL one way.

[budm]

Re: Ltv-32w6 Backlights no picture

If you look at the bottom side of the power supply board, you will see the voltage labeling showing:
CN2002 PIN6~10 should have 24VDC when PS_ON is received.
CN2003 Pin1 is PS_ON, you should have 3VDC or more on this pin. Pin7 is 5V Standby that should always be there when the TV is plugged in.

So please look and see you do have PS_ON signal or not.
Are you sure you have backlights, the reading on post 1 does not show any 24V reading.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

And I can see the back lights lighting up through the holes on the back

[budm]

Re: Ltv-32w6 Backlights no picture

Then take the readings on the connectors of the power supply again, it cannot be what you had posted in post1.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

All the readings in Post #1 were taken with AC cord plugged in and no power button activated. Would you like me to take readings again with power on?

[tom66]

Re: Ltv-32w6 Backlights no picture

Yes, please do that. We need to see if any supplies are low or missing.

[budm]

Re: Ltv-32w6 Backlights no picture

OK, now that make sense and explain what you are seeing. Looks like you are not having much luck working on Westinghouse TV.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

CN2002 PIN6~10 all have 24.0v-24.6v
CN2003 Pin1 is PS_ON is 2.8v
Pin7 is 5.02v

Screen is glowing and can hear the dvd playing, can see backlights through the holes.

[lilmonk3]

Re: Ltv-32w6 Backlights no picture

Lol.. Budman.. I have had 3 including this one.. Fixed one and pitched one and hopefully can fix this one