Daewoo 103FH, Service Manual

Page: 26 / 58

24
7-1. Dynamic Focus
Focus is poor
Is the
waveform of the
DF pin in HVG (pin 1)
correct?
HITACHI : 450V 180V
SAMSUNG : 370V 180V
1. Check the CRT socket
or connector wire.
2. Trouble in HVG or CRT.
1. Check the 12V DC line.
2. Check Q607, Q602,
Q603, Q605 and Q604.
3. Check the waveform of
pin 13 in IC501.
4. Check the DZ610, DZ611.
F
VH
F
VH
F
VV
F
VV
No
Yes
Yes
Is the
waveform of
the pin 13 in IC501
correct?
Yes
Is the
collector voltage
of the Q605
about 650V?
1. Check the waveform of
the pin 1 of HVG.
2. Check D620, D619.
No
Yes
No
Trouble in D604, D605.
Trouble in IC501.
No
2.0V
1V
0V
0.8V
Is the
base voltage
waveform of the
Q605 correct?