THE SCREEN IS VERY DIM EVEN AFTER ADJUSTING THE BRIGHTNESS TO MAX.
ALSO AFTER ADJUSTING THE SCREEN VOLTAGE AND FOCUS ON THE FLYBACK TRANSFORMER,STILL NO CHANGES NOTICED TO THE
WHAT COULD BE THE PROBLEM?
Concerning the problem above i.e dim screen, my tube is ok, i replaced a capacitor of 22mfd 250volts but there was a slight improvement.
Im now planning to replace these capacitors around the power circuit.
I hope there will be improvements,please advice.
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If those lines are slightly tilted (diagonal) you may be seeing the retrace of the horizontal sweep which isn't supposed to be visible.
At the loss of some brightness, adjusting the screen voltage on the flyback transformer (large, black block with a fat lead connecting to the forward side of the picture tube) may help but it is likely that there is a (possibly bipolar) electrolytic capacitor is failing.
This would be located near the flyback and is marked in some manner as bipolar and will be in the range of 10 - 30 uFd.
If you attempt this yourself, it will require a good deal of caution since there are potentially exposed high voltages in this area.
Some kind of insulated tool is recommended and the flyback will have two (rarely three) adjustment located on it; one will adjust focus, the other screen voltage.
If you are reluctant to try this yourself, it's OK, this kind of DIY isn't for everyone.
Is that diagonal thin line about 10 to 20 degree slant? And then you have a very bright raster?
Then you set the flyback(for tube tv), I think its "screen" voltage is set too high adjust it slowly to lessen the brightness. It is commonly a small pot on the side of the flyback together with the focus pot.
If you have raster turn the tv on, use insulated screw diver, then slowly turn the knob to the direction(CC or CCW) where your raster go dim.
Be careful your dealing with live and high voltage. If your not inclined on electronics better not to.
there is a problem in the flyback section of the tv set. the fly back has two knobs, one for screen and the other for focus. use the screen knob to adjust the brighness. if it did not help, either check the capacitors around the flyback or change the fly back with a new one. good luck
If you promise not to touch the wrong thing, you can adjust the
screen and focus knobs on the high-voltage transformer (what we call
the flyback). Do you see the big red wire going to the CRT tube?
That is the anode lead of the high voltage (around 25,000 volts).
The thing that it goes to on the circuit board has 2 little knobs
coming out the back of it. Try adjusting those (use a tool with
insulated handle if you please) to increase the brightness and improve
the focus. When the screen adjustment is all the way up and it is
still too dark - then its time for a new TV.
The picture is very dark
it is mostly due to
1 power supply output is low.
2 voltage on crt g2 pin is low.
3 video output supply is low.
4 some components in luminance section might be defective or loose.
5 finally crt getting weak is set is old.
If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.
This problem may have been coming from the Flyback Transfromer or the Tippler, you have to be a technician to adjust that! if you are, well first thing is to put the TV ON and sent up all the level to max for the brightness & Contrast, then after try to adjust the Flyback screen voltage for hi bright, if it work there, try back now to see if you are getting any control of the menu of brightness & contrast to work! please be careful, there about 28K volts to 35K volts, this can kill anyone... IF YOU ARE NOT A TECHNICIAN PLEASE DO NOT OPEN THIS TV....
Flyback transformers usually have 2 adjustable rods - 1 is for focus the other is for screen (G2) voltage. try turning Clockwise the Screen adjust with brightness-contrast at max. Till you see white diagonal lines, then go back until the lines disappear - then tune the brightness to your desired level.
the neck board of the monitor needs tube replace it is corroded with carbon if you cannot get a replacementbuy a new monitor.but also check the flyback also it could be faulty replace it check www.dalbani.com for your monitor parts or repairworld.com,good luck.