hi i have a lg plasma tv that powers on fine and has a great picture and sound but after 15-30min parts of the picture start going grainy
if i split the tv screen up in 10 sections horizontally with 1 being bottom and 10 being top ...i would say the 2 groups of areas that go grainy are section 9 thru 10 and section 2 thru 5
but the odd thing is that both groups areas go grainy off and on...but both at the exact same time on and off
and when the image on the screen has a lighter background the grainy picture areas 9-10 and 2-5 goes away but as soon as the picture has a darker image/scene the grainy areas comes back in these areas.
all the other areas of the tv screen are always good during light and dark scenes
i have attached two pics ..you can see with a lighter scene the entire picture is great but with darker scene you can see the distintive areas that are grainy
also one other thing to note.....there are 2 caps that are bulged...1 is on power supply that is next to connector that goes to y board and other is on the z board
voltages tested fine at startup of tv...but i havent checked voltages when areas of screen become grainy
any ideas what could be causing this grainy issue that seems to have a pattern with dark and light scenes but only in certain areas of the panel which only occurs
after tv has been on for a while.
if i split the tv screen up in 10 sections horizontally with 1 being bottom and 10 being top ...i would say the 2 groups of areas that go grainy are section 9 thru 10 and section 2 thru 5
but the odd thing is that both groups areas go grainy off and on...but both at the exact same time on and off
and when the image on the screen has a lighter background the grainy picture areas 9-10 and 2-5 goes away but as soon as the picture has a darker image/scene the grainy areas comes back in these areas.
all the other areas of the tv screen are always good during light and dark scenes
i have attached two pics ..you can see with a lighter scene the entire picture is great but with darker scene you can see the distintive areas that are grainy
also one other thing to note.....there are 2 caps that are bulged...1 is on power supply that is next to connector that goes to y board and other is on the z board
voltages tested fine at startup of tv...but i havent checked voltages when areas of screen become grainy
any ideas what could be causing this grainy issue that seems to have a pattern with dark and light scenes but only in certain areas of the panel which only occurs
after tv has been on for a while.
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