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Samsung SyncMaster 223bw screen flickers on startup


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#1 leachim

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Posted 25 September 2012 - 03:55 AM

This is a 22" screen and is fine after it is warmed up, but in the morning it takes 5 minutes of switching on and off before a steady picture occurs

It has 2 inputs - dvi and vga - no difference on which input

If this is a common problem and the remedy is a simple bit of soldering, I might be able to mend it !

Cheers

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#2 Platypus

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Posted 25 September 2012 - 05:00 AM

If I recall correctly, these are prone to bad electrolytic capacitors. They can be replaced with decent quality 105C electrolytics. Samsung can have a habit of using odd values like 820uF, which can be replaced with 1000uF if necessary, but they might also be an odd physical size, in which case a substitute that actually fits in could be harder to find.
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#3 leachim

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Posted 25 September 2012 - 05:03 AM

Thanks

Any idea how I might locate these components inside

I know that when the tops become domed, it is an indicator of failure ?.....

#4 Platypus

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Posted 25 September 2012 - 05:12 AM

Yes, typically they bulge, split or leak leaving a pale brownish residue. Most monitors use between two and four reservoir capacitors, and they should all be replaced even if not all show distress. Any smaller electrolytics can mostly be assumed to be OK, unless they're leaking etc. The large high voltage capacitor that smooths the rectified mains might also show signs, but mostly it's OK. Remember it could hold a high voltage charge, although if the power supply is still operating, it should discharge.
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#5 leachim

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Posted 25 September 2012 - 06:43 AM

Yeah

I looked inside and found 4 slightly domed capacitors - no leakage

3 are 820uF 25V 20mmx10mm (bigger ones wont fit) the other one is a 330uF 25V

Had a look on the Maplin site (UK) and didn't find any real replacements......

#6 Platypus

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Posted 25 September 2012 - 07:03 AM

Maybe Farnell/Element 14:

http://uk.farnell.com/
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