Is the
voltage at O/P
of D442 normal
(80-190V)?
Is
the H.V.
correct
?
Does raster
light up with
SCREEN control
turned clockwise
?
Is the
voltage at
heater normal
(6.3V) ?
Is the
waveform at
Pin 1 of T430
normal ?
Is the
waveforms at
Pin 26 of I401
normal ?
Is the
voltage at
T2 normal ?
Are
Q433,
D434 OK ?
Is the
high voltage
protection CKT
active ?
No raster
Check PWM B+
CKT Q440, Q438,
Q439, D442, C435,
D435
Open L440, Input 31KHz
signal apply 80V DC on
Pin 9 of T440
Is defective
Reset SCREEN
control.
Check brightness
circuit Q495,
Q497, R482
Check spot killer
Ckt Q348, D348
Check FBT, CRT
Check R930,
Check
Check D453, C453, R452,
R443
Check Q429,
D428, C427, R424
Check D446, R447,
R445, C434, C435,
C451, P440, L483
Check T440, P440,
T430, CRT
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
(
3) No Raster appear
