Sony KDL-40S4100 image problem vertical lines

[Bagi]

My Sony KDL-40S4100 recently started having image problems. 3/4 of the left side of the screen is affected by this (see images). When I first turn on the TV the whole area is black. When playing a video it changes in color according to what is playing and sometimes the image corrects itself for a second or two. It seems that this happens more consistently with bright images. Sometimes when turning the TV off and turning it back on (without unplugging) I see vertical colored lines. This happens with all input sources.

This is what I have done so far without any change to the problem:

1) cleaned and reset ribbon cables
2) changed t-con board
3) checked tab bonds (tapping, heating etc.) does not affect the image

Could this be a power problem or more likely a bad tab bond? Any suggestions are welcome.

[Glitcher]

Re: Sony KDL-40S4100 image problem vertical lines

Looking up the model number on google, seems like this model is known for bad tab bonds and bad panels (Its the sony panel with the speaker on the bottom of the screen). So I would assume its another bad panel.

[tom66]

Re: Sony KDL-40S4100 image problem vertical lines

Looks to me like an actual panel fault rather than a tab bond fault because it doesn't affect all of one half of the panel. Small chance of tab bonds fault.

We actually had very few this week but it's typically around 5 or 6 per week on badcaps.

[Bagi]

Re: Sony KDL-40S4100 image problem vertical lines

When you say panel fault do you mean the driver board or the actual LCD panel? Why would a bad panel affect 3 segments simultaneously and the picture still show correctly every once in a while (as shown in the last image I uploaded)? Is there anything I can measure on the driver board to see if there could be a problem there (voltages, resistors etc.)? Trying to learn a bit more about this issue before giving up on this set.

[tom66]

Re: Sony KDL-40S4100 image problem vertical lines

Yes, LCD panel.

Usually, I like to say panel fault rather than tab bond fault, because for all but a few failures, there is no viable fix, even if it is intermittent.

Typically, you're talking about one of the solder balls on the underside of the source driver chips (at top of panel) failing - unfortunately, these are bonded to the ribbons which are essentially unreplaceable, unless you happen to have a $1mn tab bonding machine and new ribbon to replace.

[Dogework]

Re: Sony KDL-40S4100 image problem vertical lines

Is there any fix to this? I recently got a KDL-40S4100 for free, and the same portion of the screen is completely dead. I messed around with the tabs with no luck.

I haven't tried any video sources, just a channel with no antenna attached.

Picture attached.

[tom66]

Re: Sony KDL-40S4100 image problem vertical lines

There isn't any fix if it is a panel problem, short of replacing the actual screen, but that's not really worth it.

[Moreno83]

Re: Sony KDL-40S4100 image problem vertical lines

The best thing you can do is IF you have any spare parts replace the parts and see if its the same.
Or just tab on some cables/tabs to see if you can find anything. Are all tabs getting warm? ( The small resistor or what is it ).

[Dogework]

Re: Sony KDL-40S4100 image problem vertical lines

There isn't any fix if it is a panel problem, short of replacing the actual screen, but that's not really worth it.

Okay, good to know, I guess I'll be recycling this one.

The best thing you can do is IF you have any spare parts replace the parts and see if its the same.
Or just tab on some cables/tabs to see if you can find anything. Are all tabs getting warm? ( The small resistor or what is it ).

I don't have any spare parts. All the tabs appeared to be warm, from what I remember.

[tekguy702]

Re: Sony KDL-40S4100 image problem vertical lines

Hey did you guys. I got a similiar issue on the same model sony except one half of the screen is completely out. When hooked up a input and move it around the picture comes on any chance its the main board??