Sceptre 32" Flashing (Video)

[smigglet]

Today i turned on my tv to play some black ops, and came across this BS.

What the hell is wrong with it, and what can i do, or check?

here is a video of whats happening. The power is on, and i can still hear the audio, but the tv just flashes black on and off.

VIDEO
http://s962.beta.photobucket.com/use...90736.mp4.html
VIDEO OF TV APART HD

http://www.youtube.com/watch?v=MwzU53dLJWk

i disconnected everything, and i have it powered, and it still doing it.

Im a broke college kid help me out

[drpj23]

Re: Sceptre 32" Flashing (Video)

If it is flashing and audio is still present it sounds like your backlights are flashing on and off.
Is there still an image (with a flashlight) when it goes "off"?

But in a general sense, it could be the main, inverter, or power supply.
Try to get your hands on a digital volt meter....they are cheap ones at local hardware stores or perhaps you know an EE student.

What is the model of your TV?

[smigglet]

Re: Sceptre 32" Flashing (Video)

Thank you for your fast reply greatly appreciate it.

The model is Sceptre Model: X32

I just checked it with a flashlight, and there is no image, i made a better high quality video, i took the back panel off, so you can see if anything seems out of the ordinary, i checked and everything looks good to me nothing bulging out. Im Uploading the video.. as i post this.

How would i go about testing the inverter or power supply? I have a multi meter, im good with electronics, never had to mess with a tv though.

[smigglet]

Re: Sceptre 32" Flashing (Video)

http://www.youtube.com/watch?v=MwzU53dLJWk

[budm]

Re: Sceptre 32" Flashing (Video)

OK, Can I get the close up pictures of the inverter board (the long board with lots of transformer on it) at the white connector so I can see if it has any labeling on it.
I am looking for 24v, and BL_ON PINS.

[smigglet]

Re: Sceptre 32" Flashing (Video)

Pics uploaded

[smigglet]

Re: Sceptre 32" Flashing (Video)

I came across another discovery, When i turn on the tv it works fine for the first few seconds, solid picture, if i turn it off at this point, it will remain off. However, when it begins flashing, and i press the the power button itll turn off, but it will turn it self on. Here is a video of what im talking about.
http://s962.beta.photobucket.com/use...24601.mp4.html

it just did it once, not no more though.

[budm]

Re: Sceptre 32" Flashing (Video)

Please use the 'GO ADVANCED' to upload the pictures, not posting the pictures in line, it takes a long time to load up the page when you post the pictures in line. Can you please reload the pictures?

[smigglet]

Re: Sceptre 32" Flashing (Video)

Done

[smigglet]

Re: Sceptre 32" Flashing (Video)

I also got a magnifying glass and looked at every single little thing. I then came across this, but i dont know if its a leaking CAP it has blue stuff, do they even leak blue stuff, or could it be some residue from the plastic that the cap is wrapped in?

Here's a pic, can the location of this cap even have an affect to what it is occurring to my television?

[drpj23]

Re: Sceptre 32" Flashing (Video)

pins 1-5 are the 24v and pin 12 seems to be the BL_ON. Monitor the voltages by putting the red lead on the corresponding pin and the black on the chassis.

The blue looks to be like a marking, whether purposeful or not, does not look like anything to be worried about.

[tom66]

Re: Sceptre 32" Flashing (Video)

Whenever I see a blinking screen I immediately suspect the PFC circuit or the main 400/450V bulk capacitors.

[smigglet]

Re: Sceptre 32" Flashing (Video)

Made somewhat of a discovery, when i was about to test i began filming, and i kept the red test probe on the pin, but the TV wouldnt flash, so i was like "Cool it works now," i plugged in my hdmi from my PS3 in, and it was a clear picture, so i turn off the TV, and turn it back on, but it started flashing. Heres a video when i was testing:
You can see in this video where i began testing, and i was waiting for the screen to start flashing, but it didnt.
http://s962.beta.photobucket.com/use...85641.mp4.html
So then this is when i plugged in the hdmi, and everything stayed on.
http://s962.beta.photobucket.com/use...90104.mp4.html
Then when i turned off and back on it started flashing again, so i continued the test
http://s962.beta.photobucket.com/use...90323.mp4.html

I had the Multi meter positive on VmA and the dial on ACV 200, hope i got it right.

pins 1-5 are the 24v and pin 12 seems to be the BL_ON. Monitor the voltages by putting the red lead on the corresponding pin and the black on the chassis.

The blue looks to be like a marking, whether purposeful or not, does not look like anything to be worried about.

I finished testing them, and i made a video, so you can see it for yourself. The first 1-5 pins wouldnt fluctuate when the tv was flashing, but 12 was, and the pins next to it.

Whenever I see a blinking screen I immediately suspect the PFC circuit or the main 400/450V bulk capacitors.

I dont really know what the pfc circuit is on tv or where the 400/450 bulk capacitors, can you point them out, and tell me how to test them? I tried image searching them on google, but there different looking ones.

Please and thank you

Greatly appreciate the help everyone.

[tom66]

Re: Sceptre 32" Flashing (Video)

If you post a picture of your power supply, we can highlight the PFC/bulk capacitors.

You need to set your meter on 200 DCV for measurements between 20V and 200V, and 20 DCV for measurements from 2V to 20V. You shouldn't need ACV except for checking mains voltage is getting to the device (in this case, it is, as the unit is working, although flickering.)

[smigglet]

Re: Sceptre 32" Flashing (Video)

Here you go

[Pentium4]

Re: Sceptre 32" Flashing (Video)

That large cap with the green triangle is the bulk cap

[tom66]

Re: Sceptre 32" Flashing (Video)

OK, I highlighted the PFC and the bulk capacitor.

While working, the voltage should be around 400V across the bulk capacitor (+/-20V is fine.)
When in standby, it should drop down to around 160V.

Can you check this -- be careful, high voltage!

[smigglet]

Re: Sceptre 32" Flashing (Video)

Done

I set the meter to 1000 DCV

When the tv was off/standby it was 172-173
When i turned it on it was 363-364

heres a vid of the test
http://s962.beta.photobucket.com/use...tml?sort=3&o=0

i couldnt keep the probes in contact that good cause i was filming, but when i held them still i got the above results.

[budm]

Re: Sceptre 32" Flashing (Video)

as DRPJ23 suggested "pins 1-5 are the 24v and pin 12 seems to be the BL_ON. Monitor the voltages by putting the red lead on the corresponding pin and the black on the chassis." See if the 24 V is fluctuating, same on BL_ON.

[tom66]

Re: Sceptre 32" Flashing (Video)

If you were in Europe I would say that is suspiciously low but I heard of low PFC voltages for US-made sets.

Damn, forgot the image... I manage this somehow... Here is what I was referring to in the last post: