I think I've found one problem . not sure what is causing it. On power supply board (plug 803, pin 21 MARKED. M5v_on) I'm only getting 3.25 volts instead of 5 volts. The ysus and zsus are getting. 5 volts but don't get warm or sound like they are fired up.
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Re: Lg 50pg20ua plasma sound no picture
No pictures no voltage states so can't help really. But set has sound so it has turned on which means power supply is on and producing some voltage so you need to focus, at this stage, on the overall scene including Vs Va etc to see what is or isn't right.Last edited by maxvalutech; 01-27-2018, 01:58 PM. -
Re: Lg 50pg20ua plasma sound no picture
Ive checked the Vs and Va and all other voltages marked on the different boards and they all seem correct except the 3.25 volts I see at (5v_on) does anyone know why it drops for 5 volts to 3.25. There are two other pins on that plug marked 803 that say 5v and they both have 5v when i metered them ?Comment
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Re: Lg 50pg20ua plasma sound no picture
.Attached is a training manual wherein the procedure for forcing on the power supply is shown as well as the purpose of M5-on (bias/raster op). As tom66 says in other threads most likely y or z sustain board problem but these sets also bad sanwha caps. You need to find out if the drop in voltage is caused by other boards or the power supply itself hence the force PS on procedure.Last edited by maxvalutech; 01-28-2018, 01:36 PM.Comment
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Picked up a bahemoth plasma TV not too long ago and just now getting around to looking at it.
No picture but you hear the TV static (white noise) playing loud and clear.
The back was already taken off (and no screws were provided) as the previous owner had already taken a look.
But it seems they didn't get too far and just left it.
When I first took a look I was amazed at how pristine the inside looked.
Its as if the TV had been in a time capsule.
Caps looked like they were just pulled off the self.
Copper coils had no sign of corrosion on... -
Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged... -
Hi all
I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.
Symptom:
No picture no sound.
When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
No sound at all.
What I tried:
1. I tried unplugging the left or right ribbon...
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