Visio SV470M - Orange standby only

[ahickman]

Pulled a sizeable Visio SV470m from the trash today. Opened it up and plugged it in to the isolated xformer. Orange Visio standby light comes on but no response to the PWR button. Checked all fuses and voltages on PS. Getting a steady 5 VDC, but no 12V. I will get pictures of each board in a few minutes, but would like to know if I should be expecting any other voltages present along the ribbon cable of the PS?

[ahickman]

Re: Visio SV470M - Orange standby only

Pictures of the boards...

[drpj23]

Re: Visio SV470M - Orange standby only

5v should be all that's active right now. A regulator can cause that symptom or in your case probably rust.

You can check the p/s by jumping the STBY to PS_ON with a 1kohm resistor with main wire harness disconnected.

[tom66]

Re: Visio SV470M - Orange standby only

Looks like fairly bad rusting around those input ports, how long has it been in the trash?
(I want to know where to get a TV from trash... I have to buy all my faulty ones!!)

[ahickman]

Re: Visio SV470M - Orange standby only

Not a clue as to how long it was exposed. Kinda bummed when I opened it up and saw the rust. Hopeful though. To answer your question about the TV's from the dump, all landfills in the county have recycling centers which include an electronic repository. Tons of TV's each month. Like heaven for those of us that are willing to repair. Most of the TV's I have fixed over the last year are being hidden around the workplace this month. Kind of a hide and seek Christmas treasure hunt. Makes for lots of fun.

[ahickman]

Re: Visio SV470M - Orange standby only

Confused as to which pin is PS_ON. Is it ON/OFF in the picture above?

[tom66]

Re: Visio SV470M - Orange standby only

Probably...

[budm]

Re: Visio SV470M - Orange standby only

The ON/OFF is the PS_ON.

[ahickman]

Re: Visio SV470M - Orange standby only

With a 1K Ohm resistor between 5V STBY and ON/OFF, the 12V fires up. Checking all the regulators on the main board now.

[ahickman]

Re: Visio SV470M - Orange standby only

Power Supply Output:
12.17 VDC
5.13 VDC

U5
2.05 (ADJ)
3.30 (OUT)
5.06 (IN)

U2
2.05
3.28
5.11

U6
6.81
8.07
12.16

U7
2.04
3.28
5.06

U4
0.00
1.24
3.30

U3
2.05
3.30
5.06

U9
0.55
1.80
3.30

U8
12.16 (IN)
0.00
5.02 (OUT)

[ahickman]

Re: Visio SV470M - Orange standby only

Anyone?

[ahickman]

Re: Visio SV470M - Orange standby only

U6 or U9 look suspect in terms of Vout?

[selldoor]

Re: Visio SV470M - Orange standby only

I am not sure we have enough information to know.
You need to list the results with the part numbers and if possible links to the data sheets.
https://www.badcaps.net/forum/showthread.php?t=13813

[tom66]

Re: Visio SV470M - Orange standby only

U6 and U9 are both good.