Is the
waveform at Pin
2/6/11 of I901
normal
?
Is the
waveform at Pin
29/32/35 of I901
normal
?
Is the
waveform at
cathode R/G/B of
CRT normal
?
R/G/B is
Check signal cable.
C901/C931/C961
I901 is defective
Check video circuit
Waveform at pin
1/3/2of I904
Check 12V lines
Check 75V lines
CRT is defective
(4) R/G/B is Missing
No
No
No
Yes
Yes
Yes
Is the
waveform at
Pin 32 of I501
normal ?
Is the
waveform at
Pin 40 of I501
normal ?
Loss of vertical
synchronization
Check I401
Check
I501, C328 defective.
No
No
Yes
Yes
(5) Loss of Vertical Synchronization
Is the
waveform at
Pin 1 of I401
normal ?
Is the
waveform at
Pin 39 of I501
normal
?
Loss of horizontal
synchronization
Check I401
Check Q550, C550,
R551,C551
I501, C408, R408, R405,
C405 is defective.
No
No
Yes
Yes
(6) Loss of Horizontal Synchronization
No vertical scanning
(7) No Vertical Scanning (One Horizontal Line)
