Sceptre X505BV-FHDU8HJ1L01

[Lrojas]

Hi guys, I was hoping to get some help. I got this Sceptre TV I'm hoping to fix and give my daughter and her spouse. I was hoping it was just the power supply but it's hard to say, I think I got a bad board. The voltages I got are as follows:
Plug. Reading
+5V. 0V
+5V. 0V
PS-ON. 0V
+5VSB. 4.49V
+5V. 0V
+5V. 0V
GND
GND
12+V. 0V
12+V. 0V
JP13. 0V

PLUG
24+V 0V
24+V. 0V
GND
GND

PLUG
VBL+ 0
VBL+ 0
NC
VBL- 0
VBL- 0
NC
GND
VCC. 0
CNT. 0
PT. 0
FB1. 0.2
FB2. 0

PLUG
BL-ON. 0
ADJ. 0
PS-ON. 0
GND

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

Here is a picture of how it's connected

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

You need to jumper the 5VSB to PS_ON using a 1K resistor with mainboard disconnected and then measure the voltages again.
To test the backlights connect as above but with the additional of a second 1K resistor between 5VSTB and BL-ON

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

You need to jumper the 5VSB to PS_ON using a 1K resistor with mainboard disconnected and then measure the voltages again.
To test the backlights connect as above but with the additional of a second 1K resistor between 5VSTB and BL-ON

I will check that as soon as I get a resistor, THANKS

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

You need to jumper the 5VSB to PS_ON using a 1K resistor with mainboard disconnected and then measure the voltages again.
To test the backlights connect as above but with the additional of a second 1K resistor between 5VSTB and BL-ON

I'm sure you are going to say, ugh this guy doesn't remember a damn thing, but I just want to make sure I don't mess up anything else than what is the original problem LOL

so I jump from power supply board 5VSB to the cable plug PS_ON, correct?

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

With mainboard disconnect from power supply; yes.

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

With mainboard disconnect from power supply; yes.

Only change is 5VSB 5.26volts now
No backlights
No front led
No other voltages present

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

That does look as though it's a bad power supply. Can you post a good picture of the underside of the power supply. Can't find a schematic for it so may be a difficult one to fault find.

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

That does look as though it's a bad power supply. Can you post a good picture of the underside of the power supply. Can't find a schematic for it so may be a difficult one to fault find.

Full board

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

That does look as though it's a bad power supply. Can you post a good picture of the underside of the power supply. Can't find a schematic for it so may be a difficult one to fault find.

Slit toe closer, 3 parts.
Bottom right is 120v in

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

That does look as though it's a bad power supply. Can you post a good picture of the underside of the power supply. Can't find a schematic for it so may be a difficult one to fault find.

Part 2

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

That does look as though it's a bad power supply. Can you post a good picture of the underside of the power supply. Can't find a schematic for it so may be a difficult one to fault find.

Part 3

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

There are a lot of RJ resistors on the underside of the board. With the set off, check with your meter set to ohms, that they read 0 ohms or close enough.

With the set on, what dc voltage do you have on D22 & D23, black probe to chassis.

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

Ok so in my frustration and non patient self. I turned in the power supply board that I thought was non-functioning and received another. It didn't fix it.
I admit that I couldn't find D22 or D23 anywhere. I found D21, but not the others.

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

D22 & D23 location

[dick_barton]

Re: Sceptre X505BV-FHDU8HJ1L01

Also with the replacement power supply what voltages if any have changed at the connectors?

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

D22 & D23 location

Oh hell, I'm a dummy I have been focusing on the backside lol. Now I really feel dumb.


The initial replacement and the new replacement don't have any voltage anywhere. I'm going to email the vendor and cut my losses there

[Lrojas]

Re: Sceptre X505BV-FHDU8HJ1L01

So since I felt I wasn't getting anywhere with the power supply I decided to get a main board.... It fixed it. I'm guessing a return signal wasn't getting back to the power supply.

Thanks Dick Barton for the help!!