LG OLED C1 Pixel Cleaning Made Picture Worse

[rumi409]

Hi,

I'm trying to resurrect a LG OLED C1 TV that has some panel banding. I used the TCON error bypass to get a picture. I was able to update the firmware as well. But when I performed a pixel cleaning to try to get the banding out, it made the image significantly worse. I tried to undo the effects of the pixel cleaning by performing a factory reset and IN_Stop, but that didn't work. Any way to reset pixel cleaning data?

[Diah]

Pixel refresh ,had no Data. its clean the Data if there to keep the OLED Cells raw.
if you unplug the TV over night out from wall socket, next day it will refresh. better to try disconnect the EVDD >22V out from T-CON driver boards. and keep the T-CON 12V VCC plugged. it will do refresh with out cells VCC ,
on other hand this part at the middle are the fault at Panel which u terminated the error signal from T-CON to Micom on MB.. see over here one member had cut the metal at this area and found shorted cap on Panel buffer boards.

[rumi409]

Pixel refresh ,had no Data. its clean the Data if there to keep the OLED Cells raw.
if you unplug the TV over night out from wall socket, next day it will refresh. better to try disconnect the EVDD >22V out from T-CON driver boards. and keep the T-CON 12V VCC plugged. it will do refresh with out cells VCC ,
on other hand this part at the middle are the fault at Panel which u terminated the error signal from T-CON to Micom on MB.. see over here one member had cut the metal at this area and found shorted cap on Panel buffer boards.

Thank you for the quick response. I'll try to disconnect the EVDD cable and leave the tv on to try to trigger the cell refresh without VCC.

Did the other member post any pictures of the process of cutting out the frame and performing the repair?

[Davi.p]

Did the other member post any pictures of the process of cutting out the frame and performing the repair?

No. My opinion is that you need a new tcon, but needs to be coming from working set, cracked panel.. You can have a bad capacitor, otherwise you had no image.

[rumi409]

No. My opinion is that you need a new tcon, but needs to be coming from working set, cracked panel.. You can have a bad capacitor, otherwise you had no image.

I have a Main board and TCON from an A1 that I will try.

[Davi.p]

You can have a bad capacitor, otherwise you had no image.

sorry, mistype.. "you can't have..."

[rumi409]

Pixel refresh ,had no Data. its clean the Data if there to keep the OLED Cells raw.
if you unplug the TV over night out from wall socket, next day it will refresh. better to try disconnect the EVDD >22V out from T-CON driver boards. and keep the T-CON 12V VCC plugged. it will do refresh with out cells VCC ,
on other hand this part at the middle are the fault at Panel which u terminated the error signal from T-CON to Micom on MB.. see over here one member had cut the metal at this area and found shorted cap on Panel buffer boards.

I tried disconnecting the TV from power overnight and that didn't bring the picture quality back.

I tried disconnecting the EVDD and kept the 12v VCC connected then powered on the tv to refresh the cells. This also didn't work.

I tried swapping out the TCON with one from an A1. This didn't power on the tv. It tried to turn on, but all I saw was a faint light all across the screen.

I then swapped out the Main board with the A1 board. Then the tv turned on and the picture was much better. However, this meant that I was downgrading the tv. This combination of A1 main board and TCON also produced a picture that was not uniform in brightness.

Based on my testing it looks like when you run Pixel cleaning, the results from the process is stored on the TCON. I'm going to try to find a way to reset the C1 TCON or put it into another TV and run Pixel cleaning to store new values.

[Davi.p]

Questions: The A1 boards are took from a working set?
Did you do a cleaning with the A1 set of boards?

the results from the process is stored on the TCON.

Yes, i agree too, that is what i call "panel calibration", and that is what are there for
the emmc and some of the ram chips..
My guess is the same as always, your C1 tcon is phisically damaged , bad BGA chip set soldering, maybe a turn in the oven like the amateurs do (with flux) restores the functionality but it's not a perfect job.. bye..

[Diah]

I tried disconnecting the TV from power overnight and that didn't bring the picture quality back.

I tried disconnecting the EVDD and kept the 12v VCC connected then powered on the tv to refresh the cells. This also didn't work.

I tried swapping out the TCON with one from an A1. This didn't power on the tv. It tried to turn on, but all I saw was a faint light all across the screen.

I then swapped out the Main board with the A1 board. Then the tv turned on and the picture was much better. However, this meant that I was downgrading the tv. This combination of A1 main board and TCON also produced a picture that was not uniform in brightness.

Based on my testing it looks like when you run Pixel cleaning, the results from the process is stored on the TCON. I'm going to try to find a way to reset the C1 TCON or put it into another TV and run Pixel cleaning to store new values.

yours photo , it show the same distribution area on the screen with A1 boards... ( this had nothings to do with Pixel refresh as i said early ), if you keep these boards in place you will kill them because of the fault on panel,

back to yours C1 T-con... show please yours DIY blocking the SOS Signal.

[rumi409]

yours photo , it show the same distribution area on the screen with A1 boards... ( this had nothings to do with Pixel refresh as i said early ), if you keep these boards in place you will kill them because of the fault on panel,

back to yours C1 T-con... show please yours DIY blocking the SOS Signal.

So if I keep running the tv with the panel defects, it will kill the TCON?

Attached is the picture of the cable with SOS signal blocked.

[rumi409]

Questions: The A1 boards are took from a working set?
Did you do a cleaning with the A1 set of boards?

Yes, i agree too, that is what i call "panel calibration", and that is what are there for
the emmc and some of the ram chips..
My guess is the same as always, your C1 tcon is phisically damaged , bad BGA chip set soldering, maybe a turn in the oven like the amateurs do (with flux) restores the functionality but it's not a perfect job.. bye..

Yes, the A1 board and TCON was from a cracked screen tv.

The vertical lines were there with the C1 and A1 board and TCONs. The change in picture quality (decreased brightness, crushing black, and blotchy picture) was after pixel cleaning was performed. That's why I'm hesitant to run it again with the A1 board and TCON.

[Diah]

So if I keep running the tv with the panel defects, it will kill the TCON?

Attached is the picture of the cable with SOS signal blocked.

i wrote at other OLED threats the blocking of the SOS error signal. not for enjoying the TV working... its just to let the MICOM don't turn off the PSU so we will have time to see at which area the screen effected and how ...
dropping high currents from Panel for sure will effected the T-CON driver boards... and if this dropping of currents ( not at your case ) coming from the OLED Cells.. then we will expected even high damage at screen too as the Cells burning ( fire ).

at time we know at which area effected... here need to disconnected all 4-6 ribbon cable from T-CON and start testing all caps lines with High Precision Milliohm Meter to discover the one leaking or short.

at my end. i asked you to show yours Blocking of SOS. just to let ether users to stop jumping with wrong advice as this set never work with out the DIY of SOS blocking. end from my side.

[Davi.p]

The vertical lines were there with the C1 and A1 board and TCONs.

ok , was not clear to me.. i saw photo on a cellular.. now on a PC..

The change in picture quality (decreased brightness, crushing black, and blotchy picture) was after pixel cleaning was performed.

where do you saw there is compatibility within C1 panel - A1 Tcon? It sounds a bit strange to me.. i can guess that the calibration process involves also a part of the column / row drivers within the panel...
apart from this, i think bad caps on panel are impossible, but the vertical defects now appears to me possible defective panel, maybe bad connection on the center bottom tabs... besides this, i think there's no elctrical compatibilty problems between A1-C1 tcon, and if it was mine, i think the possibility to run calibration on various passes.. remember every LCD or OLED panel pixels have a capacitance, this capacitance disappears not as fast as an eye blink, i saw personally a videclip where a suddenly unfed panel , with applied backlight, showed faint image for long time.. i think OLED panel needs to be turned on for hours to go back to normality..

[rumi409]

i wrote at other OLED threats the blocking of the SOS error signal. not for enjoying the TV working... its just to let the MICOM don't turn off the PSU so we will have time to see at which area the screen effected and how ...
dropping high currents from Panel for sure will effected the T-CON driver boards... and if this dropping of currents ( not at your case ) coming from the OLED Cells.. then we will expected even high damage at screen too as the Cells burning ( fire ).

at time we know at which area effected... here need to disconnected all 4-6 ribbon cable from T-CON and start testing all caps lines with High Precision Milliohm Meter to discover the one leaking or short.

at my end. i asked you to show yours Blocking of SOS. just to let ether users to stop jumping with wrong advice as this set never work with out the DIY of SOS blocking. end from my side.

Do you think the white bands are areas of short that need to be blocked or repaired? Are those areas with high current?

[rumi409]

ok , was not clear to me.. i saw photo on a cellular.. now on a PC..


where do you saw there is compatibility within C1 panel - A1 Tcon? It sounds a bit strange to me.. i can guess that the calibration process involves also a part of the column / row drivers within the panel...
apart from this, i think bad caps on panel are impossible, but the vertical defects now appears to me possible defective panel, maybe bad connection on the center bottom tabs... besides this, i think there's no elctrical compatibilty problems between A1-C1 tcon, and if it was mine, i think the possibility to run calibration on various passes.. remember every LCD or OLED panel pixels have a capacitance, this capacitance disappears not as fast as an eye blink, i saw personally a videclip where a suddenly unfed panel , with applied backlight, showed faint image for long time.. i think OLED panel needs to be turned on for hours to go back to normality..

I didn't know if the A1 TCON would work with the C1 panel, just had one lying around so I tried it.

Do you recommend leaving the tv on with the original C1 TCON and main board for a few hours with changing bright images? I can try that if it will bring the picture quality back. Is there a way to disable the pixel cleaning feature?

[Davi.p]

NO! i already said my option, original TCON is damaged (bad balls), i think you might try A1 tcon, but keep in mind , to use it with original MB, maybe there it need to do a service menu operation, i don't know why it didn't work with A1 TCON, maybe this is momentary situation due to A1 tcon seeing some electrical charges on the C1 panel.... i guess that you could try them together again and insist.. beside this you don't need to disable cleaning, i think cleaning is mandatory to fix things.. in many passes... keep in mind i never worked on an OLED TV, in future i will do maybe.. all you tries at your own personal responsibility

[Diah]

Do you think the white bands are areas of short that need to be blocked or repaired? Are those areas with high current?

log in menu E-Z adjust and show here the first page and Panel page.... then log in menu IN_START and show the error listed over there... hope and wish no more distributing in this threat so we can focus on solution.

[rumi409]

I didn't see a E-Z adjust option, but I saw a Service menu. Here are the photos from the service menu and In Start menu requested.

[rumi409]

For comparison, here is the same menus with the A1 main board and Tcon. Notice that the vertical white bars are much less viewable. I didn't run the pixel cleaning on the A1 board.

[Davi.p]

What i want to know, is it possible that the TV model is as simple as C1 or A1? I think there is a more specific tag, for other users reference it could be of help if you specify...