Re: fixing a Levono/IBM 6659 PCD monitor (any idea what part 'F701' might be?)

grindlay@xxxxxxxxx wrote:

Right I see. Well, repairing smpsus driving EHT stages is not
especially straightforward, so if youre a graduate student I dont think
your odds are very high on this.

Just out of curiosity, are there typically EHT stages in LCD monitors?

no, i was thinking it was crt for some reason.

Maybe for the backlight?

CCFLs do run on HT


However if you must, the smpsu is refusing to start: why? Either its at
fault or its going into protection mode because of a fault downline,
which usually means a horizontal output area fault.

A bit more info on the symptoms which might serve as a clue: For about
10 minutes after the DC powersupply is plugged in to the monitor, the
unit will power up fine. However, after it has sat for 15 or 20
minutes plugged-in, it will then refuse to power up until its unplugged
and then re-plugged in. The powerswitch is just a SPST button (checks
out fine) that pulls a logic signal low. That's about all I could get
from probing the (multi-layer) board. Strange symptoms, but I'm hoping
useful info for someone more experienced than me.

thanks,
Graham

if its lcd its more likely to just be the psu.


NT

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