1, IBM2248 - 005
① contrast is not adjustable;
② brightness is flabby;
③ fluctuation is jumpy;
④ left and right sides cannot adjust;
⑤ character is unsharpness;
It is normal that ⑥ monitor begins everything, use screen impression a little while to bleach, put out monitor, cross reopen a little while normal;
Everything is normal when ⑦ just switched on the mobile phone, the character that controls monitor with a hour changes empty; The reopen after putting out monitor for some time becomes normal again.
Breakdown analysis and solve:
Afore-mentioned the first, 2, 3, 4 kinds of phenomena are most common, but solve very easily also. Because the potentiometer quality before monitor is bad to cause,they are almost, and likely a few potentiometer have a problem at the same time. To this kind of problem, can not want a potentiometer first from board on below solder, and clamp of the mouth that use a needle places bad potential adjuster with proper force, look to whether return to normal. If need a hand to move normally,move section experiment back and forth a little while, normal square but consign is used. If the effect is not ideal, change breakdown potentiometer can.
Because focusing is undesirable,seem those who cause now to the 5th kind. The focusing potentiometer that need outputs to going undertakes modulatory, after adjusting general recoverable normal; But having a kind of case is: Some monitor adjust at that time return to normal, after using period of time focusing is undesirable; Another kind of circumstance is to adjust anyhow focusing potentiometer is not effective, can try with method of high-pressured electrical shock at this moment (this kind of method is more dangerous, do not advocate commonly use) , can return to normal sometimes. If still abnormal, need to change to be outputted all right; Be expert at need to change kinescope when output is normal.
To the 6th, 7 kinds of phenomenon criterion output itself problem to go more, change an output is average recoverable normal. Especially the 7th kind of case appears, can be opposite when just switching on the mobile phone with a hair dryer the travel output of monitor undertakes heating, if time is very short,screen character empty is an output breakdown for certain, change can. If do not act well, need check to look up from travel output derivative the focusing to socket extremely whether does the solder contact of that line of voltage and socket oxidize, if oxidize, solder afresh can return to normal, this kind of method also can be used in the monitor maintenance of other brand. As a result of 2248 - 005 monitor solder technology is better, this kind of phenomenon is very scarce.
2, IBM2248 - G03
Breakdown phenomenon: Open monitor mains switch to burn insurance.
Breakdown analysis: According to breakdown phenomenon preliminary decide have short circuit trouble for part of monitor power source, emphasize so check from part of monitor power source.
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