19" KDS computer monitor (flat
screen),model:XF-9P,chassis:C812,year:Feb 2002,LG Electronics
(Goldstar) CRT,UL Listed:7K04 (Sampo).Problem no power I found
Q706=2SC5584=NTE2533=SMPS x-fmr transistor is shorted due to cracked
solder connections at the base signal drive components:
R723
D705
R734
D706
R720
R721
T701=horizontal driver x-fmr
I replaced Q706 the monitor powered up with hv for a second then a
chirping with an increasing rate from the power supply so I now
D706=BY459F (diode connected to collector and emitter of Q706) is
shorted but the new Q706 is fine.
I would like any common repair tips for this chassis before I replace
D706 and I would like a possible NTE substitute as NTE does not list
one and this diode comes in a rectangular case that is screwed on same
chassis heatsink as the SMPS x-fmr transistor (Q802=2SC5339).
I don't repair computer monitors because usually about 70% of them have
defective flybacks but I rang this one and it's fine.Thanks in advance.
Note:this unit is similar to 19" HP computer monitor M90
model
6433A,chassis:C812
Sidney
Dartmouth,Nova Scotia
Canada
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