Abnormal Vertical Size; Focus Failure - Philips 109B7 Service Manual

19" CDT Color Monitor

7-8. Abnormal Vertical Size

Adjust V-size function and then test the
voltage variety of IC101 Pin33, 34
OK
Check the vertical output waveform v of
IC601 Pin5
OK
Check the inner setting of IC102

7-9 . Focus Failure

Adjust the FBT Focus VR and
then check the screen
OK
Check FBT Pin13 dynamic
focus waveform
NG
Check it is horizontal focus
waveform or vertical focus
waveform?
Horizontal NG
Check T403、
C720、C489 related
circuit
NG
NG
NG
NG
Check CRT G1、
G2 voltage
NG
OK
Check IC101 Pin24
output waveform
Vertical NG
Check Q742、R741、D740 related circuit
34
Check IC601 、R606 and relative circuit
Check IC601, R606
Reinstall IC102（EEPROM)
OK
Readjust voltage
NG
CRT failure
IC101
109B7