Trouble Shooting Chart; 7-1.Noraster - Philips 107E7 Service Manual

17" CDT Color Monitor

7.Trouble Shooting Chart

7-1 No Raster
1.CRT Relative Circuit Problems
CHECK MAIN PCB POWER SUPPLY
56V, 14V, 80V, 7V(80V FROM FBT)
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 21.0~ 22.8KV
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK SCREEN VOLTAGE ABOUT
400V TO 600V
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOLTAGE
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 56V TO 65V
NG
OK
NG
OK
NG
OK
LESS THAN 300V
OK
NG
OK
NG
CHECK POWER SAVING CIRCUIT,
H-SYNC, V-SYNC SIGNAL
Q907, Q908, Q909, Q910
REFER ITEM S.M.P.S.
CHECK IC101 PIN18 OUTPUT
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q908
CHECK FBT
CHECK BRIGHTNESS CIRCUIT
Q705 RELATIVE CIRCUIT
REFER ITEM 6-2
"ABNORMAL DISPLAY"
28
107E7
OK