Question about Apple M6496 17" CRT Monitor

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Snapping sound When I fire up this monitor I get a snapping, crackling sound like the flyback has a small hole in it shorting to ground. I check this out and found no such thing. Removed the crt board and still doing same. I did see some arching around the neck of the crt. Any help would be appreciated. Thank you Ron Price [email protected]

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Could have a shorted gun, or a small crack in the neck of the crt

Posted on Feb 17, 2007

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There is a short within the HT section and this can be possible with the failure of the flyback transformer or the driver transisitor.
So if you are equipped please open the back panel and check for shorting on the driver, also when powered this can heat up which confirms that the flyback is shorted.
replace with the same type.
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that sounds like your tv flyback explode inside.or some component in the power supply. if you are not a tech have a repair man take a look on your tv.good luck.but you have not enter the brand of your tv.
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Problem in the high voltage circuit, check connections on flyback transformer and high voltage diodes on flyback to see if shorted,
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sounds like you have in intermittent short at one of the picture tubes. Probably a small hole in the bell housing of one of the picture tubes that arcs to ground once the high voltage reaches a certain level, then arcs to ground & shuts the TV off. Not cheap to repair. Probably will cost about $500
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A crackling sound could mean that the flyback's insulation has failed and it is arcing inside. If that is the case then it may stop working entirely pretty soon. Take it to a tech as soon as you can, the flyback is a pretty expensive part, however if it blows it can break the set to the point that repairs will not be worth it.
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the horizontal output transistor appears to be short-circuit.
the clicking noise is the SMPS power cycling as it detects a circuit fault.
the real problem here is finding out what killed the HOT, flyback transformer is the usual culprit.
Personally, i'd ditch this monitor. good quality flat screen CRTs can be had for almost nothing these days and the cost to repair this will exceed the cost of a good 2nd hand 21-22" sony/mitsubishi unit
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Sounds like you have a bad flyback Transformer...Crackling is high voltage leaking. I would quit turning it on and replace the main board in the set if you are good at soldering you can replace the flyback transformer but cost wise it is easier to replace main board. 20" might not even be worth the repair.
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solder all around the flyback area if this not resolve the problem replace the flyback
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Check the Flyback, had same problem, replaced it and the unit worked good.
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