Trouble Shooting Chart; No Raster, Crt Relative Circuit Problems - Philips 105G7 Series Service Manual

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6.

TROUBLE SHOOTING CHART

CHECK MAIN PCB POWER SUPPLY
76V 、14.2V
NG
OK
CHECK THE HIGE VOLTAGE OF CRT
ABOUT 24.5~25.5V
NG
OK
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
NG
OK
CHECK SCREEN VOLTAGE ABOUT
500V TO 700V
LESS THAN 300V
OK
BRIGHTNESS SET TO MAX
NG
OK
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 40Vpp
NG
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6.1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS

CHECK LOWER POWER CIRCUIT H-
SYNC，V-SYNC SIGNAL Q909，Q910
REFER ITEM S.M.P.S
CHECK FAILSAFE CKT IC401 PIN2
RELATIVE CKT.
CHECK CRT'S HEATER RELATIVE
CIRCUIT D923
CHECK FBT
CHECK G1 CIRCUIT Q705
RELATIVE CKT
REFER ITEM 6-2 "ABNORMAL
DISPLAY"
14
OK