I am facing a problem of Horizontal setting. My picture is coming in the centre of the screen. I am not able to Expand the raster to ringht or left. Vertical raster is fine. Facing problem in adjusting the horizontal raster on my monitor. Please help. I have tryied all settings from inside.
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Re: Horizontal setting is Out
Once you're ruled out your PC and video card by trying a different monitor, I would suspect the problem is a bad video / signal board inside the monitor.
If so, it needs component-level electronic troubleshooting to locate the bad part(s).
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I found the user manual online, and the pictures in it are really helpful and make this make a lot more sense, but: 1. Press [SCREEN MODE], to switch the TV aspect ratio. 2. Press [SCREEN MODE] repeatedly until the normal screen displays. NOTE: • Some programs may not offer all display mode options. 4:3 Programming [Sidebar] Sidebar displays a 4:3 picture at its standard 4:3 size. Sidebars will be displayed on the right and left edges of the screen. [Full] Full displays a 4:3 picture at a 16:9 size, with horizontal elongation necessary to fill the screen. [Cinema] Cinema displays a 4:3 picture at a 16:9 size, with less horizontal elongation necessary to fill the screen because a little bit of the top and bottom edge of the screen will be cut off. [Wide] Wide displays the center of the picture as original size and the outer sides of the picture will be elongated. The size of the picture will depend on the original signal. 16:9 Programming [Full] A picture is displayed at 16:9 size as it is. [Zoom] Zoom displays a 16:9 picture without changing its horizontal and vertical ratio, at its maximum size. [Cinema] Cinema displays a 16:9 picture with vertical elongation. [Expand] Expand displays a 16:9 picture with horizontal elongation
either your vertical driver or output circuit capacitor(s) defective, try this remove rear cover and with something insulated like a straw prod and poke around the circuit board,sometimes theres a cold solder joint, if picture starts to expand on screen its a solder joint
To my knowledge, it is not the zoom that has to be adjusted but rather the horizontal width, zoom would expand all (to, bottom & both sides) whereas your only concern are the two sides.
Should the horizontal width not fully expand, then there is an internal problem with the horizontal deflection circuitry which could either be the yoke, a capacitor or shunt diodes. In certain instances, a below normal voltage at the mains or the internal power supply could also cause this.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.
So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
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Severe vertical jitter on picture, horizontal sides of picture ragged
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White line down centre of screen (top to bottom}
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
My LG tv has suddenly got a problem with the picture. Whilst watching the tv with no problems at all,
the picture was suddenly reduced to a thin vertical line down the centre of the screen
and an awful smell seemed to come from the tv
There is a short ckt in your tv in horl. section.
1 isolate power from horizontal section.
2 check for normal output from power supply.
3 check parts in horl output section
a hor.output transistor
b diode & cap in h/output trnsformerckt.
c check for print.
d if all are ok check for eht transformer.
e if every thing becomes then reconnect hor output section supply.
f put on the set.