Samsung QN55Q80R Bad Panel Help

[Storyteller12]

Got this tv and it would reboot with no picture when I got it.

Unplugged mainboard from power supply and all leds light up and stay on.
So I try tape method and got the tv to stay on and not rebooot but no picture.

If I cover just the 1st pin on lvds cable the tv and backlight stay on just no picture.

I've tried every combination of pins to cover and can't get a picture for nothing.

Just curious if anyone else has this problem with this model and found a solution?

Any suggestions or help would be appreciated.

I circled the lvds cable that I taped and marked the side of the cable that I covered with tape on the first pin to get it to stay on.

[Diah]

Re: Samsung QN55Q80R Bad Panel Help

could you upload close focused photo on the other LVDS socket ( the top one ) at main board

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

Here you go. Let me know if you need me to remove heatsink.

[Diah]

Re: Samsung QN55Q80R Bad Panel Help

remove yours masking on other LVDS which you did... and try this exact pins masking at MB side...

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

Install the jumper, and now you can experiment - disconnect the left and right bars in turn.

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

remove yours masking on other LVDS which you did... and try this exact pins masking at MB side...

Ok tried those pins and the tv just reboots again with no image

Also tried with the 1 pin I had covered and the pins you asked me to cover and tv stays on but no image

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

Install the jumper, and now you can experiment - disconnect the left and right bars in turn.

I will try this now but can you explain what this does by jumpering them. Just trying to understand what I'm doing.

Thanks

[Diah]

Re: Samsung QN55Q80R Bad Panel Help

Ok tried those pins and the tv just reboots again with no image

Also tried with the 1 pin I had covered and the pins you asked me to cover and tv stays on but no image

no boot loop doesn't mean any.... you need to approve if you have sound.

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

Lotas, with that jumper and 1 of the lvds cables unplugged I got image on half the screen.

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

Lotas, with that jumper and 1 of the lvds cables unplugged I got image on half the screen.

Yes, it should, now you know which half is not working.

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

I will try this now but can you explain what this does by jumpering them. Just trying to understand what I'm doing.

Thanks

With this jumper, T-CON thinks that you have two cables connected, and gives signals to the panel, if you disconnect any cable without a jumper, nothing will happen.

[Diah]

Re: Samsung QN55Q80R Bad Panel Help

from my test was also should show complete screen.. but as he said no change / no boot i think you have some where on this half broken glass of LCD... take out the bezel and inspect the courmers

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

Ok, I got a full image but the picture is washed out and not really acceptable.

Diah- you weren't far off as the pins I covered were right where you pointed me. Just a few off I believe.

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

Try another + 2 pin.

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

Ok, I got a full image but the picture is washed out and not really acceptable.

Diah- you weren't far off as the pins I covered were right where you pointed me. Just a few off I believe.

Then check SPI Flash is not shorted.

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

I’m gone for the day but will check tomorrow and report back.

[Diah]

Re: Samsung QN55Q80R Bad Panel Help

rubbish Samsung... why people buy this trash

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

rubbish Samsung... why people buy this trash

You make me laugh. So true, but unfortunately there is really no good tv to buy these days. Seems like they're all crap. If not Samsung your just buying another pieces of shit from another brand.

[Storyteller12]

Re: Samsung QN55Q80R Bad Panel Help

Update, I tried covering those 2 pins as well but no luck. Same washed out image.
Also checked both winbond chips and neither are shorted and I measured 3.3v on vcc.

[lotas]

Re: Samsung QN55Q80R Bad Panel Help

Sometimes it helps to reduce the VGH voltage on the non-working side.
The TVS diodes on the bar were measured with a multimeter for low or short resistance.