Visio VO320E - black screen

[budm]

Re: Visio VO320E - black screen

OK, base on your reading at ADJ pin and Ground:
U2: 2.04v (Out = 2.04 + 1.25 = 3.29V. Your reading on post 14 is 3.28V = Good)
U8: 0 v (Out = 0 + 1.25 = 1.25V. Your reading on post 14 is 1.23V = Good)
U9: 1.24v (Out = 1.24 + 1.25 = 2.49V. Your reading on post 14 is 2.48V = Good)
U7: 2.04v (Out = 2.04 + 1.25 = 3.29V. Your reading on post 14 is 3.29V = Good)
U4: 2.04v (Out = 2.04 + 1.25 = 3.29V. Your reading on post 14 is 3.28V = Good)
U5: 1.36v (Out = 1.36 + 1.25 = 2.61V. Your reading on post 14 is 2.60V = Good)
U11: Not applicable. Pin out is not the same as 1117 regulator. It is not getting Vin (12v) from the power supply board.

All the 1117 regulators are OK.

[budm]

Re: Visio VO320E - black screen

I need good closed up pictures of the two white multi-pin connectors on the power supply so I can see the labeling of some kind to tell us what those pins are. Same thing on the other ends of these two cables that go back to the main board. I need signal names so we can probe them.

[budm]

Re: Visio VO320E - black screen

OK, we need to check the DC voltage on the connectors of the power supply board, black probe will be on the chassis.
Red probe at:
CN201, PIN PS_ON.
CN202 PIN ON/OFF.
You will be taking the reading with TV off Vizio is amber, report the readings, then hit the power switch (Vizio is white) then report the readings.

[wenter]

Re: Visio VO320E - black screen

Amber Visio:
CN201=0
CN202=0

White Vizio:
CN201=2.26
CN202=1.73

[budm]

Re: Visio VO320E - black screen

That may be OK.
We can tell if the PS_ON is OK or not by checking the CN201 to see if you have 12v or not, if you do then the PS_ON signal is OK. The 12v should only present when you hit the power switch. Can you check that?

[wenter]

Re: Visio VO320E - black screen

When I turn Power Switch to "On"

CN201=2.26
CN202=1.74
CN203=1.74
CN204=1.74

On the first picture CN202-204 are marked with 12v

[budm]

Re: Visio VO320E - black screen

I am confused, the 12v pins are on CN201 on the power supply board, what are you getting? only 1.74V?

[wenter]

Re: Visio VO320E - black screen

Yes, I am getting only 1.74v. The tester is set up to 20V

[budm]

Re: Visio VO320E - black screen

That means your power supply board is not working. Which explain why the 7805 regulator is not getting any output, no 12v.

[wenter]

Re: Visio VO320E - black screen

What should I check on the board then? Or should I just get a replacement board?

[budm]

Re: Visio VO320E - black screen

Power supply board:
http://www.shopjimmy.com/vizio-0500-...upply-unit.htm

$50 free shipping.

[wenter]

Re: Visio VO320E - black screen

Thank you for your help.

[budm]

Re: Visio VO320E - black screen

Just let us know if the new board fix the problem.

[wenter]

Re: Visio VO320E - black screen

After replacing the power supply board TV is back in business.

Lesson learned: start with PSU first