Hitachi CPX380W Service Manual page 15

Picture is not displayed when
the RGB signal is input
Check at operating mode
Are these signals
NO
present at each pin listed on
the Drive PCB?
CH106 : R signal
YES
CH102 : G signal
CH104 : B signal
CH112 : H sync
CH113 : V sync
Are these voltages
NO
present at each pin listed on
the Drive PCB?
I812 : +14V
1
1
IV22 : +17V
YES
1
I102 : +6V
1
I841 : +4.3V
Drive PCB
Picture is not displayed when the VIDEO,
S-VIDEO, Component Signal is input
Check at operating mode
Are these
voltages present at
each pin listed on the
Drive PCB?
YES
Are signals
present at each
pin listed on IV01 of the
the Drive
PCB?
YES
CHV29 : VIDEO (Composite)
CHV28 : S-VIDEO (Y)
CHV27 : S-VIDEO (C)
CHV34 : Component (Y)
CHV35 : Component (Cb)
CHV36 : Component (Cr)
Drive PCB
Change the
IS01 on the Signal
PCB, is it repaired?
NO
Signal PCB
Power Unit
(Circuit)
LCD panel
NO
I812 1 : +14V
IV22 1 : +17V
Power Unit (Circuit)
I102 1 : +6V
I841 1 : +4.3V
the voltage at pin
NO
3 of I102 on the Drive
Signal PCB
LCD module
YES
IC (IS01)
EL4332CS
Measure
0V
PCB.
Drive PCB
5V
PJ750-2
CP-X380W
15