Sceptre X322BV power supply

[huckster24h]

...erratic video on a Sceptre X3222BV TV (random horizontal lines and color blocks, video fallout, jerky video). Picture is fine after about an hour. ...Put a scope on 5 and 12 volts, and found substantial spikes that subside after an hour, corresponding to video problems. I suppose that it could be anything on the power rails, but most likely power supply MIP320FL-2. So going to swap out the lytics. A couple of questions, though:
Does anyone know the values for EC10 and EC14? Can MIP320FL-2 be replaced with MIP320FL-Q3?
Great forum! Looking forward to sharing...

[dbdezyne]

Re: Sceptre X322BV power supply

I also have a X322BV with almost same issue. When first powering up, the SCEPTRE logo comes on for a few seconds then goes out. Backlight is still on. I've already replaced the T-con, Main Board and Power supply. I can't imagine the panel doing this, but at this point I am out of ideas. After about 10 minutes it works fine. Definitely a thermal issue, but where is the big question unless the panel can causing something like this.

[huckster24h]

Re: Sceptre X322BV power supply

Replaced all lytics in power supply except EC1 - 82uf, 450V; EC2 - 10uf, 50V; and EC14 - 10uf, 50V. BTW, EC10 is 220uf, 35V (replaced). No joy. I suppose it could be a polymer.
I will proceed to replace the rest of the lytics. Then try hair dryer/ coolant spray again to induce/pinpoint problem.
Hi dbdezyne... Any progress? Does your panel stay blank for 10 min. following logo, then AOK, or eratic horizontal noise in video for 10 min? Please tell me more... Thanks for your input

[Shane711]

Re: Sceptre X322BV power supply

I too have this TV Sceptre X322BV. At first I thought it was the main board but I recently got another one with a cracked screen. So I replaced the main board and it did the same thing. Logo would flash once and then nothing. So then I suspected the power board. I started checking the caps, some of them would not hold a steady reading so I changed those. Now after replacing the caps the TV comes on but goes on and off frequently with half a screen or lines. So I guess I am onto something. budm said in another post to check the voltages going to the T-Con board, I have 12.54 volts and it stays pretty steady. It seems for sure that the problem is in the power supply and if not then the main board. But when I have 2 main boards doing the exact same thing I would have to suspect the power supply and I only have one power supply to work with.

Then I let the TV sit over night unplugged and decided to make a video for all to see and now the TV is acting right but still has a frequent glitch with a line going across the screen, this I have a video of. I seriously thought I was going to have to reball the main chip but that is not the case.

The video I made is on YouTube: https://youtu.be/DTTykVMqojA
If you watch is closely you can see the screen going in and out.

Then after all this I did change every cap. The TV is working better then it has. Now the Logo is nice and bright, before it was dim where you could barley see it. But because the screen is till going in and out I am suspecting some bad caps on the main board. If that doesn't work then I will have to suspect the screen or T-Con board.

[Shane711]

Re: Sceptre X322BV power supply

After upgrading some caps on the main board, plus I switched out the main board and still had the same issue with the screen going in and out, I started doing some probing. The power coming out from the T-Con board seems to be steady. And checking the the screen incoming power is also steady. It seems that the fault is definitely in the panel/screen. I am going to stop on this TV for today and continue it later by taking the screen apart and checking the board attached to the screen.

[CapLeaker]

Re: Sceptre X322BV power supply

hmm... I'd be probing the LVDS before and after the T-con with an oscilloscope.

[Shane711]

Re: Sceptre X322BV power supply

I do not have an oscilloscope, maybe I should get one. I think it might be the video chip after all. It might have to be reballed. If the screen voltages check out then I guess that might be the case. But then again why are bot my main boards doing the same thing. I will have to take another video because the symptoms have changed.