Mulja tv repair portal
Equipment Repairs => PLASMA TV forum => Topic started by: lostin the woods on July 02, 2008,18:42:54
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I have a JVC GD-V4211PCE plasma monitor, i have a intermittent screen problem.
When turning the Screen on its fine, but once it warms up, i get a series of vertical lines, split in half, but scrambled, into two separate sets of lines. one top half of the screen, the other set on the bottom.
At this point it is still showing as a picture but just a scrambled mess of lines, being split into two distinct display patterns of lines.
If you gently hit the rear casing (not sure how someone can actually gently hit a plasma but there you go) the picture will revert to normal operating for a random amount of time, before it does it again.
I'm thinking its a dry joint due to the nature of the problem. the Monitor has 4 fans across the back of the set to suck hot air out, yet the screen still gets fairly hot across the back.
Id like to know what people think about this, as i really don't want to be paying someone just too look at it and tell me what i already think is the problem.
I'm thinking the dry joint upper left hand (if looking at the screen) as it only rectifies the problem if you hit in this area (on the back).
I found a service manual for the GD-V4210 but not the GD-V4211 but it lacks the depth to know what part might be causing the problem.
CLICK LINK TO SEE PROBLEM
when its warmed up it looks like this
http://i182.photobucket.com/albums/x207/Finmerephotos/DCP02420.jpg
if the image is moving both sets of bars move independently of each other, as in, if you have a mouse pointer on the desktop when the Monitor is in this state, you can tell whether the mouse is on the top of the screen or the bottom of the screen, on the left or on the right.
http://i182.photobucket.com/albums/x207/Finmerephotos/DCP02421.jpg
Its getting image data, but its just scrambled, the sound is fine though,
The OSD shows as yellow bars, so you can not access the menus when its scrambled.
You can even change aspect ratios with the screen like this and the lines will display the aspect ratio you have changed it too
Any reply / help would be most appreciated.
Regards
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its definately a dry joint somewhere...
" Id like to know what people think about this, as i really don't want to be paying someone just too look at it and tell me what i already think is the problem. "
you pay for an engineers knowledge and time to find the dry joint...just because you know you can solve it by hitting the back doesnt mean you are competent enough to repair it.....
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I'm competent enough to of already stripped the monitor down, and try and track down the dry joint my self, I'm also no stranger to using a soldering iron, oscilloscope and multimeter to circuit test.
What would be of help is the service manual but these are rare and very hard to come by, i have the supplementary service manual but not the whole thing with schematics and circuit diagrams.
What i meant by that comment was,
I don't want to have to pay a technician to tell me its a dry joint when i already suspect that it is.
The only thing id be paying the technician for is the time it takes to find it and re-solder the joint if indeed it is.
Considering that the problem is intermittent, and the screen works fine when starting from cold then displays the symptoms, my initial reaction to go with a dry joint, short of soldering everything on each PCB, the only help i really need is narrowing it down to what board is the most likely culprit