Adjusted magic focus manually. However, on the grid with the white lines, on the left side, top and bottom of the grid the white lines are not straight across and up and down. especially on the left side they curve down to the left. When you watch the picture on the tv there is a wave pattern on the far left side of screen. Not sure what to adjust to fix this problem.
I'm no expert by any means; but I wonder if it could be as simple as the reflective screening on the inside comming loose. I have a 65" and I took it apart to clean it. The reflective screening looked to me like it could be a weak point. Just a thought.
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Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---
Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.
Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.
If you have a white line on screen---middle that runs left to right it is a vertical circuit problem.
This can be a easy repair: The set uses a chip---usually 7-13 pins in a straight line package-----a lot of these sets the solder from heat breaks loose and all that is needed is to resolder the pins on that chip.
A hint: usually a good solid rap on the top or side will in this case try to make the picture open up.
You need to be able to get to the part and solder.
use the make a comment button if you have questions or need more help.
hello, Where all colors are involved - the lines are essentially white or gray (or with a slight tint due to slight unequal settings of the color adjustments), look for something common like an incorrectly adjusted screen (G2) or master brightness/background/bias control or a problem in one of these circuits, a defective power supply or a problem in the blanking circuitry:
Screen (G2) or master brightness/background/bias control - mark setting and then see if a slight adjustment removes the retrace lines. See the chapter: "TV Adjustments". Of course, if this happened suddenly, the problem is not due to a misadjusted control though a dirty pot is possible - turn it back and forth - this might clean it and restore normal operation.
Power supply or connection to CRT neck board - insufficient voltage will result in the CRT never totally blanking. Check (usually scan derived) power supply components (from flyback).
General power supply - check B+ for correct value and ripple. A main power supply fault might result in these symptoms (and usually many others).
Blanking circuit - this may be a part of the video/chroma chip or separate. Check waveforms to determine if the blanking pulses are making it to the video output.
Hi, if the line is from top to bottom, that is the horizontal circuit transistor problem;/if the is left to side that is vertical deflection ic driver and some capacitor to replace and verify soldering arround
needs to be fixed by a real tech..
have a nice day
hope that will help you.
You can't adjust because the convergence correction IC' are bad. The 3 you mention Buttons are probably for focus (electronic) and they won't help your problem. If you moved the CRT top lenses they can be re-adjusted and only affect focus (mechanical).
You have a problem in the vertical output circuit. Check for bad capacitors around the vertical output IC. The value of these caps are marked on the side of them. Thanks for using fixya. Please take a moment and rate this responce.
hi! he might have adjusted the vertical hold and height including the linearity. normally on the board you would see a trimmer resistor with a label v-hold this is to stop the rolling, v- height for the size of the picture. and linearity for the evenness of the picture from top to bottom.