27 Jul
2001
27 Jul
'01
1:07 p.m.
Hi
B+ looks like about 90VDC kinda low....but that monitor quite different....
Cant locate a C201A. The 2 mosFETS and their heatsink that serve as HOT
arent getting warm Id have to check if some kinda pulse is getting there but
was trying to see if someone had repaired a few of these and could tell me
common failures...
Claude
> I have "restored" and tested the CRT on
the N4000 (part no 135.00)
MegaPixel
monitor and
seems to be ok on a Sencore CRT tester...dont think it would
last for years now but should be giving a picture....
But I am still without a picture.
When power is turned on, I can hear the HV "crackle" for a fraction of a
second but then no HV.
Do you know just what is shutting down? For example, are the low voltage
lines from the mains PSU (presumably switch-mode, but I'd not bet on it)
present after shut-down? > I dont know if someone played around in this
monitor but on the
verticaly
mounted board
("analog board"?) C57 and C201B (top near flyback) are
One thought. C201B sounds like it might be associated with C201A. It was
quite common to have 2 positions in parallel for some capacitors in some
machines so that it would be possible to make up the correct value (say
to compensate for differences in the flyback or CRT). You could easily
check if this is the case, and whether C201A is present or not.