identity tv part

[nosugartonight]

ON a power board. This part looks like a resistor but has no color bands. It is marked jw2 4.7 with ohms sign. They are 3 in a row. Checking in diode mode they read closed. What are they and what should they read.

[nosugartonight]

Re: identity tv part

Here is a pic

[budm]

Re: identity tv part

They are 4.70 Ohms 2W connected in parallel, they are fine.
You will get more help wit make and model and problem and good clear pictures of the whole top and bottom side of this power supply board.

[nosugartonight]

Re: identity tv part

Thanks. This is a vizio VO47LFHDTV30A Has no voltages on plug/cable going to main board. Checking voltages on hot side,using negative side of large cap for ground. Everything seems ok. It's when I get to the small transformer is when there is no voltages. I will try to add pics.

[budm]

Re: identity tv part

We need good clear pictures so we can see what we are dealing with, must provide straight shot pictures of the top and bottom side of the board, the pictures must be clear enough to be able to trace out the cooper trace on the bottom side of the board.

[nosugartonight]

Re: identity tv part

Gotta. I'm trying to add pictures but after upload.stays on that screen and I click"close this window" goes back to message and everything I wrote is gone. Trying to figure it out ��

[nosugartonight]

Re: identity tv part

Think I have to upload one at a time

[nosugartonight]

Re: identity tv part

Top left

[nosugartonight]

Re: identity tv part

Bottom left

[nosugartonight]

Re: identity tv part

Top right

[nosugartonight]

Re: identity tv part

Bottom right. Hope they are ok

[nosugartonight]

Re: identity tv part

Board number 0500-0407-0680

[nosugartonight]

Re: identity tv part

Ok . Can you please tell me if the pictures are good enough

[budm]

Re: identity tv part

https://www.badcaps.net/forum/attach...5&d=1517185124
So you are 100% sure that you do not have any DC Voltage on the 5VSB pins at all?

[R_J]

Re: identity tv part

Check if R901 or R902 is open, and if Q901 is shorted

[nosugartonight]

Re: identity tv part

Ok here what I have discovered. Before I removed the power board to take pics. There was no voltages on any pins . Everything on hot side shows voltages. I believe there all right. No voltages on cold side. But when I went to put the board back. I only used a couple of screw's. I rechecked the pins. To my surprise there are voltages on the pins. When I put the bottom right screw in. Lost all voltages on pins. Tracing from the 5v pins . Everything shows grounded. All the way up to pc702 which looks like a IC but only has 4 legs. . I will post a pic. I hope you understand what I'm saying

[nosugartonight]

Re: identity tv part

The leg in pointing to is grounded

[nosugartonight]

Re: identity tv part

Should it be grounded. This leg is the only one from all 3 ic's

[R_J]

Re: identity tv part

It might be, how about turning the board over and trace the line to see if it goes to ground, it's hard to tell looking at pictures only.
"Tracing from the 5v pins . Everything shows grounded"Are you saying that you have a short on CN201 between SGND and 5VSB?

[nosugartonight]

Re: identity tv part

I can do that,ASP. Thanks for your info