Sceptre X322BCB0359

[nstlfrk]

Re: Sceptre X322BCB0359

Try unplugging the t-con board from the panel. Maybe you have a short in the panel keeping eveything else from coming on like it should.

I will try this over lunch today and let you know.
Thank you

[nstlfrk]

Re: Sceptre X322BCB0359

"What do you think about the start up caps being the issue?" for the standby +5V? You are getting steady +5V to fed the main board so that will not be it.

Ok I just thought I would ask. Appreciate the help

[nstlfrk]

Re: Sceptre X322BCB0359

Try unplugging the t-con board from the panel. Maybe you have a short in the panel keeping eveything else from coming on like it should.

Well that did not work.
Like I said I have 2 of everything and I cant get it to do anything by using any combination of parts.
Tough one here

[nstlfrk]

Re: Sceptre X322BCB0359

Ok everyone here is what I have so far. If anyone has an idea please let me know.

Picture one
Label / When on / When off
12v / 12.51 / 0
12v / 12.51 / 0
gnd
gnd
5v / 5.08 / 0
5v / 5.08 / 0
gnd
gnd
5vsb / 5.09 / 5.09
ps_on / 4.56 / 0

BK_on / 4.97 / 0
ADJ / .24 0
NC
GND

Picture two
24v / OL / .01
24v / OL / .01
gnd
gnd


Large green Cap never goes above 160VDC

I did try to turn the unit on with out the T-CON board connected and same result.

Dont know if all this helps but here it is.

[budm]

Re: Sceptre X322BCB0359

Your mother board is sending all the correct signal to the power supply board.
ps_on / 4.56 / 0 Good
BK_on / 4.97 / 0 Good
ADJ / .24 0 Good
But the high voltage circuit for the backlights will not work until you get about 360~400VDC on that cap.
That high voltage is generated by the transformer T301 which is driven by the two black power MOSFET's (there is white glue between them).
So I need the good straight shot picture of the bottom side so I can look at the PFC circuit section to see what IC uses for the circuit.

[nstlfrk]

Re: Sceptre X322BCB0359

Your mother board is sending all the correct signal to the power supply board.
ps_on / 4.56 / 0 Good
BK_on / 4.97 / 0 Good
ADJ / .24 0 Good
But the high voltage circuit for the backlights will not work until you get about 360~400VDC on that cap.
That high voltage is generated by the transformer T301 which is driven by the two black power MOSFET's (there is white glue between them).
So I need the good straight shot picture of the bottom side so I can look at the PFC circuit section to see what IC uses for the circuit.

How is this one

[budm]

Re: Sceptre X322BCB0359

OK, a straight shot of the top side also.

[budm]

Re: Sceptre X322BCB0359

OK, get the P/N of that U201.

[nstlfrk]

Re: Sceptre X322BCB0359

ok, a straight shot of the top side also.

[nstlfrk]

Re: Sceptre X322BCB0359

OK, get the P/N of that U201.

I cant see it and dont have anything to magnify it

[budm]

Re: Sceptre X322BCB0359

This is what your power supply has:

[budm]

Re: Sceptre X322BCB0359

We need the number so we can look up the spec sheet to get the pin out to test the voltages and resistance.
How about the second board? You may have to use alcohol to rub on the top to see the printing. I will not able to do much without the P/N and the spec sheet.

[nstlfrk]

Re: Sceptre X322BCB0359

This is what your power supply has:

I will Look

[nstlfrk]

Re: Sceptre X322BCB0359

Looks like L6562A and the other number is 67222

[nstlfrk]

Re: Sceptre X322BCB0359

Looks like this is it

https://cdn.badcaps-static.com/pdfs/...fb37c5dc40.pdf

[budm]

Re: Sceptre X322BCB0359

Good, that is the PFC IC I suspect.
Just the board by itself, check the resistance reading between pin 6 (Ground) against all other pins, make sure to report if the readings are in Ohm, K Ohm, or M Ohm. I will not be surprised if this IC is bad.
We are getting close to fixing this board. I hope you have the right tools to do SMD component replacement.

[budm]

Re: Sceptre X322BCB0359

Here is example of the failed PFC circuit:
Read post 41 and later:
https://www.badcaps.net/forum/showth...t=L6562&page=3

[nstlfrk]

Re: Sceptre X322BCB0359

Good, that is the PFC IC I suspect.
Just the board by itself, check the resistance reading between pin 6 (Ground) against all other pins, make sure to report if the readings are in Ohm, K Ohm, or M Ohm. I will not be surprised if this IC is bad.
We are getting close to fixing this board. I hope you have the right tools to do SMD component replacement.

Ok here is what I have.
I tested both boards

PIN1 9.696K
PIN2 14.991M
PIN3 42.874K
PIN4 299.64
PIN5 21.974K
PIN7 9.22K
PIN8 THIS IS WIRED IT SEEMS TO START AROUND 13M OR 12M AND DROP ALL THE WAY TO .56 AND KIND OF FLUCTUATES UP AND DOWN SOME.

THE OTHER BOARD GOT ABOUT THE SAME READINGS.

[nstlfrk]

Re: Sceptre X322BCB0359

BUDM I read that other thread
Do you think there is more to be looked at then whats above?

[budm]

Re: Sceptre X322BCB0359

OK, we need to check pin 8 (VCC) to see if the IC is getting >12.5VDC typ. to run.
You will use the negative leg of the main filter cap (450VDC cap) as the Ground ref point. You must be REAL CAREFUL because you are working in the primary side, it is not going to be easy since the part is on the bottom side. You should plug the board into GFI outlet to protect yourself.