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if you have the skill for take off the cover,take off the metal shield and cables until you reach the board,have a 100watt light on,a solder hot iron in one hand and a few rings of tin in the other, obviously take off the plug and left it over a few meters,and waited a few minutes to give some capacitors discharge time,.............it's easy !!!
resolder the joints that like dark,mainly see the big transistors,(or IC)that have like rings on it's pins, and thats all. I tell you its easy
okay then you have to "rebuild" your monitor back.don't make shorts pleeease.
Focus and brightness (sometimes called screen control) are usually adjusted in the flyback transformer. Check for a bad connection where the flyback is soldered to the board. This could also indicate a problem with the CRT.
If this behavior is relatively consistent, I would suspect the "mains capacitor", an electrolytic cap on the output of the AC bridge. If vibration affects behavior you may have cold solder joint(s) in the SMPS circuit. Knowing what current the monitor is drawing at turn on would be helpful.
This is an idication that the Hi voltage didnt start up. My experience with these monitors tell me the flyback and horizontal output transistor is bad and probably not worth to repair unless your a tech and know your way around tv circuitry. Its not advisable to go into these sets as there are no user serviceable parts inside. good luck