Trouble shooting chart, 1 no raster – Philips 107B7 User Manual

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17” CDT Color Monitor 107B7

28

7.Trouble Shooting Chart

7-1 No Raster

1.CRT Relative Circuit Problems

REFER ITEM S.M.P.S.

BRIGHTNESS SET TO MAX. THEN

CHECK CRT G1 VOLTAGE

NG

NG

NG

NG

NG

OK

OK

OK

OK

OK

CHECK THE HIGE VOLTAGE

CHECK THE VOLTAGE OF CRT

HEATER ABOUT 6.3V

CHECK VOLTAGE OF THE CRT

CHECK BRIGHTNESS CIRCUIT

OK

CHECK POWER SAVING CIRCUIT,

"ABNORMAL DISPLAY"

H-SYNC, V-SYNC SIGNAL

CHECK SCREEN VOLTAGE ABOUT

LESS THAN 300V

CHECK FBT

CHECK MAIN PCB POWER SUPPLY

CHECK IC101 PIN18 OUTPUT

Q907, Q908, Q909, Q910

CHECK CRT'S HEATER RELATIVE

CIRCUIT Q907, Q908

Q705 RELATIVE CIRCUIT

OF CRT ABOUT 21.0~ 22.8KV

400V TO 600V

REFER ITEM 6-2

56V, 14V, 80V, 7V(80V FROM FBT)

CATHODE ABOUT 56V TO 65V