Sceptre X32 Power Supply Diagnosis

[budm]

Re: Sceptre X32 Power Supply Diagnosis

That is correct but you must complete that connection after the power switch is activated this is to allow the power supply to stabilize before turn on the inverter which draws lots of inrush current.
You must make sure the wire on pin 12 is NOT connected.

[urfavtech]

Re: Sceptre X32 Power Supply Diagnosis

Long time no reply Budm, I apologize for that, this project got put on the side for awhile, however I just started working on it again.

We left off with me jumping the 5vSTBY on power board to pin 12 BL_ON on inverter board, since this project has been around for a year, I went ahead and bought a used main board, slightly different model, but everthing lines up the same.

Here is what I am currently running into now:

Hit power button, blue light comes on, back light does not.

Unlike before, I am able to turn the tv back off without unplugging it from power, with another push of the power button.

SO... back light not coming on, I went a made a jumper from the 5vSTBY to pin 12 on inverter with a 120 ohms resistor, and the back light did not come on.....

Before the back light would come on temporarily when i hit power button, but then back off, leaving blue light still on in which the power button would not turn tv back off without unplugging... now i get no backlight at all with new main board.

If you would like to pick up where we left off, this is where I am at on the project. Thanks ahead of time

[Eqwipman]

Re: Sceptre X32 Power Supply Diagnosis

Hi, I am new to this forum and I want to comment on this thread. I too have a scepter x32 with the same problem. after disassembling the TV I powered it up with the LCD screen attached and I could see the video so that is working. the backlights (one of them) come on dimly and then fade to nothing in a few seconds. the voltage was 20 but it keeps dropping. I think the problem is in the 24v supply. haven't troubleshot it yet but I will soon. looks like a common problem with this TV. if I come up with a solution it will let you know.

[bossman696]

Re: Sceptre X32 Power Supply Diagnosis

Hello, I am new to the forum as well and have a Sceptre X325BV-FMDR which seems to just be a variant of the model in this thread. The unit will turn on and doesn't show a picture but I do have sound. I did the flash light test on the screen and can see an image which seems to confirm the backlights are now working. I have been told on other models there is an investor board to replace, but don't know enough about this model and can seem to find whether there is a separate investor board. Any idea as to what board or part I should replace? I don't know enough about soldering to get into replacing capacitors and would like to avoid that if I can buy just replace the whole component. Any help would be greatly appreciated.