Re: Samsung UN55HU6840 No picture has sound and backlights
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I assume no responsibility for any stupid suggestions I might post. -
Re: Samsung UN55HU6840 No picture has sound and backlights
Thanks for the info.
So it looks like the Tcon is a 3.3V Tcon. What voltage is on pin 4 when you switch on and when you bring it out of standby?Willing to help but I'm no expert.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
Don't see how 55" could run off 3.3v. Looks like maybe trace runs to ic2602? 2802. Also see a 13v panel on legend.I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
Looks like 4485D maybe you can make it out. Had to magnify it to see it.
Voltage on first 4 pins is 12.76 and 0 on the last 4.
Sorry didn't see it had been posted already.Attached FilesLast edited by 2smoovedaddy; 04-24-2017, 12:53 PM.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
OK so it looks as though its a 12V supply to the Tcon. Can you measure the resistance from pins 5,6,7 or 8 to 0V (ground) with the set off and meter set to ohms.
I suspect the chip is blown and is not switching the 12V input at pins 1,2 &3 to output pins 5,6,7 & 8 when Pin 4 goes to 12VWilling to help but I'm no expert.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
All open(OL). By the way thanks for all you guys help.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
If the resistance on the output pins 5,6,7, & 8 is high then it does not look like a short circuit causing the problem so I suspect the IC to be at fault.Willing to help but I'm no expert.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
I would replace it their inexpensive. It's a 4435 P-Channel 30-V MOSFET SOP-8Last edited by dskall; 04-24-2017, 04:39 PM.I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Samsung UN55HU6840 No picture has sound and backlights
Will do I'll keep you posted on the results.Comment
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When I turn tv on, the backlights come on but there is no sound or picture. I have read that these tv's have problems with the panels going bad but the "no sound" has me questioning if the main board is bad. Is there a way to troubleshoot the main board to determine if that is the problem? -
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... -
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,
i want to repair a Sony KD-75XF9005 TV that initially only showed a grey picture.
Backlight seems to work, Sound (Setup menu after reset) works.
If i dissconnect the left FFC cable from TCON to panel i have half a screen on the right. If left cable is connected always only the grey screen.
Interchanged the cables, its always only the right side that is working. Always grey if left side is connected.
With my small knowledge i would think at least the cables are good.
Can this happen because of a bad tcon board?
Or is it always a bad/shorted... -
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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