Hello,
Sorry the following is so long.
I have a Sony Bravia KDL-40V3000 LCD TV that is not working properly when first powered up or when running for an hour or more. I am hoping someone will be able to advise what the problem might be and what PCB to change out. I am also hoping hard that the problem is not with the LCD panel itself.
As you can see from the pictures, (link is here: http://s1070.photobucket.com/user/Sc...roblems?page=1 ) there is a vertical band or bar effect going on that is a little less than 3.5” wide. This seems to indicate that one of the 10 (there should be 10 along the top as the display is about 34 7/8” wide) driver sections is not operating properly.
I applied signal through S-video input 1 and component video input 1 and both inputs had the same problem. I did not check the other inputs with signal, but I did cycle through the remaining inputs (with no video signal), and the vertical band was obvious on all inputs. Audio is fine on the inputs I applied video to. Audio was not checked on the other inputs.
The picture quality within this vertical band seems fine, but seems to be out of time or sync with the rest of the picture and thus produces two images. Not a ghost image as it is generally known, but two distinct, sharp, and clear images to describe it as best as I can. There is also a fine horizontal line at the extreme top right of the display that goes from the right edge of this vertical band to the outer edge of the display, but this is not nearly as annoying as the vertical band, and if I have to live with this, I will.
I changed out the T-Con board, but there was no difference to the problem and the band location remained at the same position on the display. I also removed the LCD panel peripheral metal bezel to check for TAB (Tape Automated Binding) failures by gently pushing on the TAB associated with this cell (if “cell” is the correct word) while the set was running, but that made no difference to the display. I also gently pushed on the remaining TABs, and that made no difference either.
The two ribbon cables from the T-Con board output were inspected and were found to be seated properly with no signs of overheating or other issues. The T-Con's LVDS input cable was also inspected and found to be seated correctly. I tap-tested all the boards and cables to check for bad solder joints and sub-standard cable connections, but that made no difference as well. Finally, I performed a power reset by turning on the set, holding down the remote's up arrow button, and then momentarily pressing the power button on the TV. That did not help either.
It seems to me that because the picture within this approximately 3.5” wide vertical band region is fine, that there should not be a problem with the LCD panel itself, but some sort of timing issue with the drive to this cell. Maybe bad capacitors in the driver???
Please inform me if my post here would be better served on another thread instead of this one.
Thank you and I hope to get this resolved as painlessly as possible....
Sorry the following is so long.
I have a Sony Bravia KDL-40V3000 LCD TV that is not working properly when first powered up or when running for an hour or more. I am hoping someone will be able to advise what the problem might be and what PCB to change out. I am also hoping hard that the problem is not with the LCD panel itself.
As you can see from the pictures, (link is here: http://s1070.photobucket.com/user/Sc...roblems?page=1 ) there is a vertical band or bar effect going on that is a little less than 3.5” wide. This seems to indicate that one of the 10 (there should be 10 along the top as the display is about 34 7/8” wide) driver sections is not operating properly.
I applied signal through S-video input 1 and component video input 1 and both inputs had the same problem. I did not check the other inputs with signal, but I did cycle through the remaining inputs (with no video signal), and the vertical band was obvious on all inputs. Audio is fine on the inputs I applied video to. Audio was not checked on the other inputs.
The picture quality within this vertical band seems fine, but seems to be out of time or sync with the rest of the picture and thus produces two images. Not a ghost image as it is generally known, but two distinct, sharp, and clear images to describe it as best as I can. There is also a fine horizontal line at the extreme top right of the display that goes from the right edge of this vertical band to the outer edge of the display, but this is not nearly as annoying as the vertical band, and if I have to live with this, I will.
I changed out the T-Con board, but there was no difference to the problem and the band location remained at the same position on the display. I also removed the LCD panel peripheral metal bezel to check for TAB (Tape Automated Binding) failures by gently pushing on the TAB associated with this cell (if “cell” is the correct word) while the set was running, but that made no difference to the display. I also gently pushed on the remaining TABs, and that made no difference either.
The two ribbon cables from the T-Con board output were inspected and were found to be seated properly with no signs of overheating or other issues. The T-Con's LVDS input cable was also inspected and found to be seated correctly. I tap-tested all the boards and cables to check for bad solder joints and sub-standard cable connections, but that made no difference as well. Finally, I performed a power reset by turning on the set, holding down the remote's up arrow button, and then momentarily pressing the power button on the TV. That did not help either.
It seems to me that because the picture within this approximately 3.5” wide vertical band region is fine, that there should not be a problem with the LCD panel itself, but some sort of timing issue with the drive to this cell. Maybe bad capacitors in the driver???
Please inform me if my post here would be better served on another thread instead of this one.
Thank you and I hope to get this resolved as painlessly as possible....
Attached Files
but I doubt Sony would put an obscure easter egg like that into their products.
Comment