Philips 107B7 manual Trouble Shooting Chart, No Raster, 17” CDT Color Monitor

17” CDT Color Monitor 107B7

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)

NG

OK

CHECK THE HIGE VOLTAGE

OF CRT ABOUT 21.0~ 22.8KV

NG

OK

CHECK THE VOLTAGE OF CRT

HEATER ABOUT 6.3V

NG

OK

CHECK SCREEN VOLTAGE ABOUT 400V TO 600V

LESS THAN 300V

OK

BRIGHTNESS SET TO MAX. THEN

CHECK CRT G1 VOLTAGE

NG

OK

CHECK VOLTAGE OF THE CRT

CATHODE ABOUT 56V TO 65V

NG

CHECK POWER SAVING CIRCUIT,

H-SYNC, V-SYNC SIGNAL

Q907, Q908, Q909, Q910

OK

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"

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