Trouble Shooting - ViewSonic P95f+-1 Service Manual

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
CHECK MAIN PCB POWER SUPPLY
CHECK MAIN PCB
60.5V, 14.5V, 80V
POWER SUPPLY 180V, 16V, 80V
CHECK THE HIGE VOLTAGE OF CRT
CHECK THE HIGE VOLTAGE
ABOUT 25±0.3KV OR Q409 DRAIN PIN
OF CRT ABOUT 25.5 ~ 26.5KV
VOLTAGE WAVE
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK SCREEN VOLTAGE ABOUT
CHECK SCREEN VOLTAGE ABOUT
500V TO 800V
400V TO 700V
BRIGHTNESS SET TO MAX.
THEN CHECK CRT G1 VOLTAGE
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 60V TO 70V
ViewSonic Corporation
6.

TROUBLE SHOOTING

NG
OK
NG
OK
NG
OK
LESS THAN 300V
OK
NG
OK
NG
CHECK POWER SAVING CIRCUIT,
H-SYNC, V-SYNC SIGNAL
REFER ITEM S.M.P.S.
CHECK FAILSAFE CKT IC401
PIN 2 RELATIVE CKT.
CHECK CRT'S HEATER RELATIVE
CIRCUIT
CHECK
CHECK BRIGHTNESS CIRCUIT
Q705, Q706, RELATIVE CKT.
Q703, Q706, Q707 RELATIVE CKT.
REFER ITEM 6-2 "ABNORMAL
REFER ITEM 8-2
DISPLAY"
"ABNORMAL DISPLAY"
14
Confidential – Do Not Copy
OK
CHECK FBT
BRIGHTNESS CIRCUIT
P95f+/B-1