There are black lines on the top and bottom of the screen. There are not any potentiometers on the back so I can't change thr picture manually. What can I do to make it look like 4:3 again. This is a crt tv by the way. Thank you in advance.
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You don't specify what make or model. On the older crts the gross adjustments are inside the monitor the outside controls are for fine tuning.
DANGER! DANGER!
To adjust the gross setting it involves removing the back cover and working near the high voltage flyback with the power on.
ONLY USE PLASTIC OR INSULATED TOOLS
(I ALSO WEAR RUBBER GLOVES)
CRTs can KILL....
There should be three plastic potentiometers with slots cut into them for a small flatblade.
On really old CRTs they also used small magnets attached to the sides of the picture tube as well.
Adjust the monitor slowly. If possible have someone else watch the picture while you adjust so you can insure not touching a live board.
You life is not worth an inch of black screen.
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eraywhite what make and model is this TV? What have you tried? Post some images of what you see with your question. For that, use this guide iFixitでの質問に画像を追加する方法 It will allow us to see what you see.
oldturkey03 さんによる