HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

[Jeremy112]

Hello everyone,

I have a Hitachi 42HDS69 plasma TV that works perfectly for about 15-20 minutes and then in the near middle of the screen, about 2 inches wide from top to bottom, there are vertical lines spaced about 1/8 of an inch apart, so about 30 or 40 lines that you see.

Now the odd thing is they are random in that they go away (mostly) and come back while viewing the source.

This does this whether a signal is input or not. What would be the cause?

[tom66]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

When the problem occurs, is the whole screen covered in lines, or just a small section?

[Jeremy112]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

When the problem occurs, is the whole screen covered in lines, or just a small section?

Just a small 2 inch wide section, the rest of the TV looks normal.

[Jeremy112]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Just wanted to add, I'm testing the TV out right now and I think its a heat related issue, when the TV is off and cools back down, it does not have the lines, after getting to a certain temperature it starts to display the lines.

I say this because its been about 40 minutes and the TV hasn't exhibited the line issue, but the TV isn't really warm yet either...

[Jeremy112]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

I figured some pictures would better illustrate the issue. I took 2 photos. One shows the green lines, one shows when they get less noticeable/almost go away.

[tom66]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

OK, it is likely a loose connector... Post a picture of the inside of your TV.

[Jeremy112]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Ok here's the inside of the set.

[capkid]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

I'll let Tom chime in, but my guess at where he was going is that there are address boards that run along the bottom of the panel behind the A/V board. One of the ribbon cable connectors between the address board and the panel in the vicinity of the defect may be loose. I'd also check the connections between the control board and the address boards.

[Jeremy112]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Well I thought you would all like to know, I went ahead and removed the input panel on the back of the TV, and saw the connections (think its called the Z buffer?) on the side of the panel that the issue was on (I marked the width of the bezel where the lines were so I could see the area while looking at the back of the TV)

The problem area was right where the connection to the buffer board went, I unplugged it, cleaned it with isopropyl alcohol, and plugged it back in and its working perfectly, heck, I even notice improvement on overall image quality.

Figured you would all like a pic to see the working product. Thanks to all for your help!!

[capkid]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

It's amazing how easily flat panel TVs can develop these simple issues. Enjoy!

[bossman103]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Sorry for bumping an old post but this is exactly what I am running into right now

I have a friend that is quite knowledgeable in this and we've already changed the ysus board to only find out problem still occurs :-(

How did you fix this and where would I find this z buffer you speak of ? Please let me know

Thanks

[bossman103]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

If you could point me in the area on your post #7 I would give it a whirl

[tom66]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

It's different for each TV. You'd need to look at the connectors underneath the main board/AV board assembly.

[bossman103]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Sorry forgot to mention, I have the 42HDS69 as well so same exact tv with exact problem :-(

[tom66]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Connectors are under here. You need to remove a lot of stuff to get at them, before doing so take a piece of tape and put it on part of the panel which is faulty as a marker for which connector is likely causing the problem. The connections must only be adjusted with power off.

[bossman103]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

Thanks ill give it a whirl tomorrow or Monday, I don't have much to lose as it doesn't work now anyways

[CNY_Dave]

Re: HITACHI 42HDS69 Plasma random Vertical lines in middle of screen

I was just given one of these, due to the stripe.
This weekend I'm going in!

Dave