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B. Abnormal Video on CRT Screen
Too dark or Too bright
Check R/G/B
Video output
(
Measure R/G/B video output
) Normally, R/G/B video output
by R904(R), R905(G) and R906 (B)
voltages are about 40Vp-p
on CRT PWB PWE-177A
except at ABL working
OK
NG
(
Measure the vOltage)
Check 130VLine
by E1 on DEF PWB
OK
Check Screen
Voltage
PWE-173A
NG
TR516 and ambient
circuit Failure
(
Measure the vOltage)
by Y on CRT PWB
........ ____ -,-____ .......
PWE-177 A
OK
Normally, the screen
voltage is about through
300V-900V
NG
C914, R940, SG905
and T504 Failure
Check brightness
Voltage
(
Measure the voltage )
by BT2 on CRT PWB
'-------.----~
PWE-177 A
NG
OK
C
Conttnue
Normally, the voltage
is around 11 .2V at the
max.
CD
TR904, TR905,TR906
TR907 and T908
Failure.
®
HC1 connecter
disconnected
®
IC503, R579 Failure.
(
Measure the vblt~ge )
Check 85V Line
by X1 on DEF PWB
'--_---. _ _ ---'
PWE-173A
~------------~
OK
Check IC701
output voltage
OK
Video output
circuit Failure
• Switching Regulator
NG
unit Failure
(See item
0)
• D520 Failure
(
Measure A/G/B output
1
Vp-p by 29 PIN(R), 25 PIN(G),
and 21 PIN(B) of IC701 on
VIDEO PWB PWE-179
NG
Normally, the outputs are
approx. 2.7 Vp-p at contrast
volume is max.
t
Check contrast
voltage
OK
(
Measure the voltage
)
by NT2 on INTERFACE
PWB PWE-176
NG
Normally contrast voltage is
approx. 11.5V at contrast
volume is max.
IC701 and
ambient circuit
CD
IC802, TR810
TR816, TR811
D811, D819
D820
TR820-TR822
and ambient
circuit Failure
®
ABL circuit
Failure
-39-
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