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Re: jvc 28gt1bjf tv
From remote control first you will have to go to service mode.
you will get MENU now you can adjust hor.hold.
if your problem is not solved please let me know so I can send you other code
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Horizontal rolling is your problem I thinks. In modern TVs there is no horizontal hold control like they wer in old one. All the adjustments are digital, that is related to a very accurate crystal oscillator frequency, and its cound downs. Therefore if your TV is not so old, its main Ic may be faulty, or horizontal synchronisation pulse does not reach the appropriate pin of that Ic. First check it, and if it is ok, replace the Ic.
Maybe your tv has a defect in the board, the problem is in the vertical ic or loose connection in the board. you need to resolder the board. to fix the problem. but the technician only can do that job to fix the problem.
it could be an electrolytic capacitor or the vertical output I.C. in the vertical circuitry,if you remove the rear cover tap on the board in different places and see if the picture fills out or atleast jitters like it might fill out,then it could be just a cold solder joint,then remove the main board and resolder all joints and this should repair the condition you have
Screen and focus adjustments are integrated into the flyback transformer. Take the back off the set and you should see the two little knobs on the transformer. A little tweak of the screen control (it may be labeled "SCREEN" or "G2") will brighten things up. Just be careful. Working on an operating TV, especially in the horizontal output area, exposes potentially lethal voltages.
Hello, I think you have a faulty "horizontal width" or horizontal
linearity preset pot. This pot will be located on the main PCB
and you can adjust it with a small screw driver, when you do the
picture will shift from left to right or vice versa, or move back to fill each side. If it wont hold after making the adjustments then the pots ( potentiometers) need replacing, which means unsoldering them from the printed circuit board( PCB) and take them in to your local radio shop for new ones. By the way you might need 2 pots ( 1 for the WIDTH and 1 for the LINEARITY)