Vizio VOJ320F1A orange light on only

[Ldempke]

This is a great venue. Thank you so much for what you do.

Vizio amber light is on when plugged in. Does not turn to white with power button. no backlight. Looked for leaking caps..did not see any obvious ones.
Downloaded the manual, and read through the forum. made the measurements below:
Power supply board:
+5.16V present, 12V pins=0, 24V pins=0
PSON voltage on J1 pin 1 = 0 (45 mV)
Main board:
U22: pin 2 =3.321V; pin 3=5.17V (working?)
Both ends of F1=5.17V, both ends of F2=0V
power off: F1 and F2 are both 0 ohms.
so does this mean the 3.3V needed on J1 pin 1 is getting dropped somewhere between U22 and F2? what should I check next?

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

oops. I guess the photos got left off. I'll try to post them here...

[retiredcaps]

Re: Vizio VOJ320F1A orange light on only

Vizio -> means check voltage regulators. See my sig file below on how to test and report results in the preferred format.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

Here is the info on these:
U22 -> pcb designation
L112 -> line 1 of the IC
G1117 -> line 2 of the IC
pin 1 = 2.074
pin 2 = 3.321
pin 3 = 5.16
XXXXXXXXXXXXXXXXXXXXXXX
U19> pcb designation
L112 -> line 1 of the IC
G1117 -> line 2 of the IC
pin 1 = 0.000
pin 2 = 0.000
pin 3 = .0045
XXXXXXXXXXXXXXXXXXXXXXXXXX
U21-> pcb designation
L112 -> line 1 of the IC
G1117 -> line 2 of the IC
pin 1 = 0.000
pin 2 = .0004
pin 3 = 0.000
xxxxxxXXXXXXXXXXXXXXXXXXXX
U17 -> pcb designation
L112 -> line 1 of the IC
G1117 -> line 2 of the IC
pin 1 = 0.000
pin 2 = 0.000
pin 3 = 0.0046
XXXXXXXXXXXXXXXXXXXXXXXXXXX
U15 -> pcb designation
1084 -> line 1 of the IC
0851SL -> line 2 of the IC
pin 1 = 163mV
pin 2 = 262mV
pin 3 = 4.6mV
xxxxxxxxxxxxxxxxxxxxxx
U20> pcb designation
1084 -> line 1 of the IC
0851SL -> line 2 of the IC
pin 1 = 255mV
pin 2 = 0.000
pin 3 = 261mV

[tom66]

Re: Vizio VOJ320F1A orange light on only

All regulators appear fine. Can we get a closer picture of this area -- it has a buck (DC-DC) converter on it for powering the CPU.

Right now it looks like a software problem. I am aware that Vizio are sending out a box to customers to fix their TV if you call them up and talk to the support people. The box plugs in to the VGA port and is supposed to reprogram something that gets corrupted.

[Dgtech]

Re: Vizio VOJ320F1A orange light on only

In your pictures above, I only see one inverter board (Master). This is the board on the left hand side of the picture showing three boards. There should be another inverter board (slave) on the right. To check these, refer to my post from a couple of years ago here:

https://www.badcaps.net/forum/showpo...4&postcount=29

Those small fets fail as well. The caps on those inverters sometimes go bad too. Overall, Vizio failures are common.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

Tom66: attached is the close photo.
Dgtech: I hadn't noticed the Slave board. it must be buried. I will look now and get those resistance measurements.

[tom66]

Re: Vizio VOJ320F1A orange light on only

OK, you can test here (at either position) for the core supply voltage. Black probe should be on frame, red on test point.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

more info: This is my friend's TV. There was a pop sound when it died. I called Vizio tech support who, since it is out of warrantee, referred me to their contracted repair center. Their suggestion was to send out a repair tech. He would have all the boards with him, and they would replace them until it worked. for $180. she didn't want to spend $180 on an older model 32", so, since I tend towards being techy...and have some electronics experience from old Air Force days, so I volunteered to take a look. After opening, I didn't see any obvious leaky or swollen caps, so began to dig in deeper, but didn't have any equipment. came back 2 weeks later with old, cheap multimeter...and found it was inconsistent. meanwhile, she bought a new tv (non-vizio). but I would still like to repair it for her, for her second bedroom...and for the fun of it. so I am here at her house until 6 or 7pm Pacific time tonight (Monday 12 Nov) I will be checking the thread often and try to reply promptly. also attached are 2 of the troubleshooting pages I found in the service repair manual. that is why I thought I wouldn't find the 3.3V on U22 when I got here last night with meter. so I posted for help. I replied to RetiredCaps post with voltages from similar fets to U22, but I'm afraid the spec sheets might be over my head. are there more Voltage regulators on that baord I should checking?
thanks guys,
Lorrie

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

OK, you can test here (at either position) for the core supply voltage. Black probe should be on frame, red on test point.

CB13: bounces and settles down to .3mV
L5: bounces to .5mV

[tom66]

Re: Vizio VOJ320F1A orange light on only

The CPU is not getting power then. It might be because the converter is off or because the converter is faulty. But this could be because it's in standby.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

The CPU is not getting power then. It might be because the converter is off or because the converter is faulty. But this could be because it's in standby.

is there something I can do to check those?

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

In your pictures above, I only see one inverter board (Master). This is the board on the left hand side of the picture showing three boards. There should be another inverter board (slave) on the right. To check these, refer to my post from a couple of years ago here:

https://www.badcaps.net/forum/showpo...4&postcount=29

Those small fets fail as well. The caps on those inverters sometimes go bad too. Overall, Vizio failures are common.

the 4 Mosfet's on the inverter board are part numbers FDD8447L. I measured Gate/Source resistance for each one at around 8.5k ohms. while the part was on the board. TV unplugged from mains.

[tom66]

Re: Vizio VOJ320F1A orange light on only

Can you get a part # for U18 near where you tested? It's the 8 pin chip.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

it is:
DII (?)(looks like a backwards C...then the II)
AP1513
0730N

Can you get a part # for U18 near where you tested? It's the 8 pin chip.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

found the spec sheet for you: http://www.diodes.com/datasheets/AP1513.pdf

it is:
DII (?)(looks like a backwards C...then the II)
AP1513
0730N

[budm]

Re: Vizio VOJ320F1A orange light on only

I download the spec sheet.

[tom66]

Re: Vizio VOJ320F1A orange light on only

OK pin #1 is marked with a small dot. Pin 2 is adjacent to it. It should be LOW (<1V), if the output is also low.

[Ldempke]

Re: Vizio VOJ320F1A orange light on only

yes, it is low. Pin 2 is 4.4mV

OK pin #1 is marked with a small dot. Pin 2 is adjacent to it. It should be LOW (<1V), if the output is also low.

[tom66]

Re: Vizio VOJ320F1A orange light on only

So it is working properly, most likely some condition on the main board is not getting met, it may have corrupted EEPROM. How old is the set? Consider calling Vizio as they may offer a fix (magic VGA/USB box.)