Question about Sony GDM-W900 24" CRT Monitor

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Sony GDM-W900 24" CRT - Intermittent flicker

Have a pair of these wonderful 24" CRT's here that have exhibited an unusual behavior. 95% of the time they are working terrific - excellent color, focus, brightness. But every so often, one or the other will do one or more of the following:

1) Get dim at the top of the screen and flicker that dimness, sometimes to the point where it reaches the bottom and blanks the whole display (only for fractions of a second) - this is the most common problem.

2) Displays a single horizontal rgb line in the lower third of the display but in no other way distorts the 1920x1200 output - less common but easiest to ignore.

3) Occasional high pitched whine (yes, this is almost certainly the flyback) - far less common, but very hard to ignore.

After a few hours these things disappear and it's back to being a fantastic monitor again. But the fact that it's intermittent makes it very hard to diagnose.

I have the full schematics and service manual for these beasts and I'm no stranger to replacing soldered components (and I'm well aware of how to discharge the HV caps). However I can't quite get my finger on what could be causing these issues.

I can pickup a replacement flyback for about $35, but I've no interest in spending the money if it turns out to be an IC somewhere else.

Any suggestions?

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  • KHolden Dec 26, 2008

    >>I would suggest check weak caps and dry solder joints in deflection area.

    Well that narrows it down to about 400 caps :) I assume it would make the most sense to check the high voltage caps first yes? There are several 2kv and perhaps a dozen or so over 200v on the deflection board. Since I have to yank them to test for leakage, I'd hate to have to pull them all...


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Resolder the junctions and points on the main board and check up for any faulty capacitors.also check for any short tracking occuring in the power section and repair the power supply points.

Posted on Dec 26, 2008

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I would suggest check weak caps and dry solder joints in deflection area.

Posted on Dec 26, 2008

  • Shahid Electronics
    Shahid Electronics Dec 26, 2008

    Please check electrolytic caps of 35 volts to 200 volts only
    As you know its bit older monitors of 1999 maybe so 10 years time is enough for caps to reduce capacitor's efficiency.

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