Abnormal Video - NEC MultiSync 3D JC-1404HME Service Manual

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(5-6) ABNORMAL VIDEO
SW. REG OUTPUT ERROR
+12V line Reg. ERROR
L - - - . - - - J - - - - - - - - - ~ -
SEE ITEM 2
CHECK +85V line
+12V line NG
OK
CHECK HEATER VOLTAGE
(+5.9V ±0.2V)
+5V line Reg. FAILURE
SEE ITEM (2-2-1)
OK
CHECK G1 (CN-X 5 pin)
DC VOLTAGE - - - - ,
i) BRIGHT VR MIN
"ABOUT -30VDC"
ii) BRIGHT VR MAX
"ABOUT -9VDC"
OK
'
CHECK
CLAMP PULSE
(CN-V 9 pin)
OK
'
NG
-30V line FAILURE
(R5D1, D527, etc.)
BRIGHTNESS CONTROL
CIRCUIT FAILURE
(0904, 0905, etc.)
B.L.K CIRCUIT FAILURE
(R520, ZD520, 0526
0525, ZD401, D409
D410, R5C2, etc.)
CHECK
INPUT VIDEO SIGNAL
~
SUB UNIT
(CN-V2, 4, 6 pin) FAILURE
OK
CHECK VIDEO PRE-AMP
OUTPUT
(IC901, 21, 25, 29 pin)
OK
IC901 FAILURE
BIAS CIRCUIT
FAILURE
(0904~908, etc.)
CATHODE
CHECK VIDEO OUTPUT
I
NGI
I
(TP901~903)
~
VIDEO OUT FAILURE (0909~0914, D903~908, etc.)
w
OK
TURN THE SCREEN VR TOO LOW
I
F.B.T. CRT SOCKET FAILURE
I
CLOCKWISE
- - - - - - - - - - 1 _ . . i • ~ - - - - - - - - - -
(300~800V)
CRT FAILURE
-40-