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Re: daewoo gb20hits tv/video combo
Sounds like something inside needs adjusting. There are some potmeters, usually *inside* on a TV, that can adjust where the image is located on the screen. On some computer minitors these are outside to let you adjust for different resolutions.
Unfortunately, you will probably have to open the TV to adjust this, and you probably shouldn't do this yourself. Why? Because there are components inside that holds thousands of volts and thay might shock you if you touch them. *Even if the TV is disconnected from the mains!* Don't touch anything metal in there with your fingers or with a metal object!
If you do open it and try, look for the small screws that can be turned. They may have a slit for a screwdriver on the end. Adjust only one at a time, and only a little until you find one that changes the property you're after (image height in your case). If the screw changes nothing, try a little more, or turn it back to where it was and try adjusting another one.
A trained TV repairman should be able to fix this pretty quickly.
If none of the adjusting screws helps the problem, it might be caused by a defective component, and you'll have to know quite a bit about electronics to fix it.
And while you're at it; clean out any dust in there (there will probably be a lot!) to help prevent any fires later on.
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do the proper isolation proceedure and try unhooking the Su from the SC board to see if you then get a normal picture all the way across the bottom half of the screen? I am assuming the Vertcal extends extends all the way from top to the bottom of the screen?
hi, if u can understand English do the following
ur tv has problem with its vertical scanning side. vertical scanning
output ic (integrated circuit ) may have some problem ( faulty or dry
soldering in its leads). u can easily find out the vertical ic on ur tv.
there will be four wire coming from the coil which is fitted on the
picture tube neck, of which 2 will goto horizontal scanning section and
the remaining two will go to vertical scanning section. just follow the
two thin wire (normally in color green and yellow ). it will goto a
socket on the main board. follow the track on the board. it will lead u
to vertical scanning section. check for any dry soldering, if not ,
replace the ic. ok
hi, ur tv has problem with vertical scanning section. may be dry soldering or vertical output ic faulty. u can easily findout the vertical section on ur tv. for that u have to open ur tv. u can see a coil is fitted on the picture tube neck. there are four lines coming from the neck, of which two will goto horizontal scanning section and the remaining two will go to vertical section. follow the two thin wire normally in color green and yellow. it will go to a socket in the main board. trace the track from that socket in the main board . it will lead u to the vertical scanning section. check for any dry soldering in that section. mainly the soldering of vertical ic. if see or not re-solder the leads of the vertical ic . then check is the tv is ok or not. if complaint remains replace the vertical scanning out pout ic. it will be fitted on a aluminum heat sink in the vertical section. if u need more assistance feel free to contact through fixya.
Bad connection somewhere along the bottom or top of the panel, there are boards most likely along the bottom of the screen that control vertical drawing, a connection that breaks as it is heated up sounds about right. check the connectors along the bottom. Be very careful because if you wreck em the screen is junk. The connector that will be at fault will be in direct line with the black bar.