Vizio E370VT no longer turns on

[jason424]

Tv did work but next day it won't turn on with remote nor button on side. Amber standby light is on but does nothing when pushing the power button.
I don't see any bad caps and do have 5v standby (which I assumed since the standby light is on in the front.
What other voltages/items should I be checking?

[bwilliams60]

Re: Vizio E370VT no longer turns on

I had one of these with a bad optoisolator. It would shut off when it got warm. Usually pretty quick. Location in your picture is top of board in middle. Just a thought.

[jason424]

Re: Vizio E370VT no longer turns on

Thanks for the response. Is the optoisolator the device that is below the 3 capacitors in the middle? I googled testing an optoisolator and it shows 4 pins that's why I ask: http://www.antimath.info/electro/how...n-optocoupler/

[bwilliams60]

Re: Vizio E370VT no longer turns on

The optoisolators are the four pin IC's above the transformer.ead correctly they are IC906 and IC9x07 ????
Follow the checker divider between the hot and the cold side at the top. Second and third components down. Try freeze spray perhaps and see if it comes on.

[budm]

Re: Vizio E370VT no longer turns on

So are you getting any commands signals for the main board feeding the power supply board when you activate the power switch?
The connector's pins are labeled so report the DCV reading of each pin of the connector that goes to the main board, make sure to put down the pin name follow by the DCV reading. We need to know what are missing.
You should also resolder those transformer legs and parts that are soldered to the through hole rivets on that power supply board.

[jason424]

Re: Vizio E370VT no longer turns on

So are you getting any commands signals for the main board feeding the power supply board when you activate the power switch?
The connector's pins are labeled so report the DCV reading of each pin of the connector that goes to the main board, make sure to put down the pin name follow by the DCV reading. We need to know what are missing.
You should also resolder those transformer legs and parts that are soldered to the through hole rivets on that power supply board.

On/Off: 0.00
Dim: .1
+12v: .1
+12v: .1
Gnd: 0.00
Gnd: 0.00
Gnd: 0.00
+24: 0.00
+24: 0.00
PS_ON: 4.8
5v+ 5.2
5v: 5.2
NC: 0.00

[jason424]

Re: Vizio E370VT no longer turns on

When testing IC906 with 200k set on meter
Pin 1red/2black: starts in 50's and steadily increases
Pin 1black/2red: nothing
IC9302
When testing IC906 with 200k set on meter
Pin 1red/2black: starts in 50's and steadily increases
Pin 1black/2red: nothing

IC9302
Pin 1red/2black: 3.3
Pin 1/black/2red: 3.3

For pins 3 and 4 on both IC's, when testing both ways I get a large number in the hundreds steadily going up and past 200k

[jason424]

Re: Vizio E370VT no longer turns on

I should also add I re-soldered the transformer legs and other thru hole items on the board.

[jason424]

Re: Vizio E370VT no longer turns on

Any additional items to check? I'm stumped as to where to go from my tests and resoldering the transformer legs.

[dick_barton]

Re: Vizio E370VT no longer turns on

What DC voltage do you have across the two legs of the long capacitors?

[jason424]

Re: Vizio E370VT no longer turns on

What DC voltage do you have across the two legs of the long capacitors?

C9803 - fluctuates between 170.7 to 170.9
C9802 - fluctuates between 170.9 to 171.1
C9801 - fluctuates between 171.0 to 171.3

EDIT: There's another long capacitor (not as long as the 3 grouped together) on the left of the board in the pic attached above, and I get 0.00 on my meter when testing that one.

[jason424]

Re: Vizio E370VT no longer turns on

I also noticed that on this TV when I plug in the power cord the power light is amber for a split second then turns to white. Previously I thought it was just always amber. I've tried pressing the power button on the side and it doesn't affect it.

[dick_barton]

Re: Vizio E370VT no longer turns on

C9803 - fluctuates between 170.7 to 170.9
C9802 - fluctuates between 170.9 to 171.1
C9801 - fluctuates between 171.0 to 171.3

EDIT: There's another long capacitor (not as long as the 3 grouped together) on the left of the board in the pic attached above, and I get 0.00 on my meter when testing that one.

What is the voltage written on the side of the capacitors

What is the number written on the 8 pin IC on the top of the board and on the 8 pin IC on the bottom of the board.

[budm]

Re: Vizio E370VT no longer turns on

So the PS-ON (4.8 Vdc per your report) is present but the DCV on the main filter caps are only 170VDC, that means the PFC Voltage booster circuit is not working, the DCV on the filter caps should be >380 VDC when PS-ON is present.

Vizio ADTVA2414AB9 Power Supply
http://www.shopjimmy.com/vizio-adtva...upply-unit.htm
Pictures provided by shopjimmy

[jason424]

Re: Vizio E370VT no longer turns on

What is the voltage written on the side of the capacitors

What is the number written on the 8 pin IC on the top of the board and on the 8 pin IC on the bottom of the board.

The 3 long caps are 47uF 450v.

I'm not seeing 8 pin IC's. I see 3 4-pins (IC9102, IC9302 and IC908) and a 7-pin (IC9301) in the center of the board.

[jason424]

Re: Vizio E370VT no longer turns on

So the PS-ON (4.8 Vdc per your report) is present but the DCV on the main filter caps are only 170VDC, that means the PFC Voltage booster circuit is not working, the DCV on the filter caps should be >380 VDC when PS-ON is present.

Vizio ADTVA2414AB9 Power Supply
http://www.shopjimmy.com/vizio-adtva...upply-unit.htm
Pictures provided by shopjimmy

That's correct, 4.8....just checked again. Are there items to test in the PFC voltage booster circuit that can isolate issue and correct? Or am I looking at trying to find a replacement board?

[dick_barton]

Re: Vizio E370VT no longer turns on

Can you give me the part number of the 8 pin IC on the bottom of the board and also the 7 pin IC on the top of the board.

[jason424]

Re: Vizio E370VT no longer turns on

The only 7-pin I see is in the middle of the board in the attached pic. It has printed on it:
A6069H
SK163
24630D

The only other ICs I see are in the checkerboard pattern running across the upper third (left since pic rotated upon upload) of the board and they have 4 legs each. Can you point out which is the 8 pin you are wanting me to check please?

[dick_barton]

Re: Vizio E370VT no longer turns on

Bottom of board IC

[dick_barton]

Re: Vizio E370VT no longer turns on

Using your meter set to DC volts, black lead on point "A" and red on point "B" what voltage do you read. It should be a minimum of 13.8V

STR-A6069H