Naprawa Monitorów

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burnt, no obvious shorts and replacements going same way shortly after switch on. Cause
turned out to be C440 (10nF, 1kV) smoothing cap for G2 voltage leaky (reading 11K) also
Q415 (BF488, used BF423 ok), R474 (33k, 0.5W), Same parts in CTX1569 are Q721, R761
and C733
Note there are different versions of this chassis depending on CRT and scan coil assembly
type, one I had uses LG CRT and scan coil assembly and had board revision 11S31-069A
REV: AS
(Kenny Cargill)
Philips Monitor Model: 7CM5279/00T
White raster with flyback lines on screen
This was due to low collector voltage on the video output transistors, replaced R3570
(0.68ohm)
(Anonymous)
JVC Monitor Model: TM1010P
Vertical scan collapse / horizontal black bars
Replace C416 with higher temp rating - goes low value due to proximity with v-drive
heatsink
(Martin)
Elonex Monitors
A common fault on these monitors is flickering lines about an inch or two from the
bottom of the screen
The solution to this is very simple. The heat produced by the frame I.Cs heatsink destroys
C313. Replace this on the underside of the pcb along with R308 (2.2ohms) which will also be
open circuit
(Peter. E)
Proview Monitor Model: 998M (PX-995 chassis)
Power Supply defective. Black lines on screen
The UC3842AN (KA3842B) was defective
After assembling there was no picture
Bad solder connections were found on the CRT board (No Heater voltage)
(Winter)
Hyundai Monitor Model: S450 (CKLS450 chassis)
Adjustment for v-size is limited. Vertical Raster is big. Other parameters are
normal
Flash dead
(Roman)
KFC / Smile Monitor Model CK1450 / CK1420
Dead
Replace R531 (560k)
(Duncan Newell)
CTX 1765S Monitor
Over-bright display, with the brightness control having no effect.
R218, 390K, in the brightness circuit had gone o/c
(John Coles) [ Pobierz całość w formacie PDF ]

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