1
This trouble shooting is premised that the monitor has any problem.
1. No Power (POWER-ON INDICATOR is off)
NO
NO
NO
YES
Is drive pulse
output from
#1 of IC901?
Is approx. 18V
input into #4
(VCC) of
IC901 ?
YES
YES
YES
YES
NO
NO
Is DC12V of
power secondary
circuit output?
Is DC3.3V
(M3.3V/D3.3V)
output from #1 of
IC609?
Is 100MHz clock
pulse input into
#12 of IC102
(MPU)?
F901
IC901
T901
Power primary circuit may have any problem. Please check
the parts below.
Power
Power
Power
Fuse
IC
Trans
X100
IC102
Control circuit may have any problem. Please check the
parts below.
MC
MC
Crystal oscillator
MPU
IC901
R928
R929
R910
IC904
IC903
Protection circuit of power primary circuit, or 12V-OVP of power
secondary circuit may operate. Please check the parts below.
Power
Power
Power
Power
Power
Power
IC
Precision resistor
Precision resistor
Precision resistor
Shunt regulator
Photocoupler
F600
IC608
IC611
IC701
IC702
Q701
Q702
Q703
Q704
T701
T702
12V line may have any problem. Please check the parts
below.
MAIN (Power)
MAIN (Power)
MAIN (Power)
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Control circuit- fuse
Controller- IC
5V- chopper- IC
Controller- IC
Controller- IC
Output- Tr
Output- Tr
Output- Tr
Output- Tr
Output- trans
Output- trans
IC608
Q602
IC609
IC602
IC604
IC606
IC100
IC101
IC102
IC400
IC300
IC303
M3.3V/D3.3V line may have any problem. Please check the
parts below.
MAIN (Power)
MAIN (Power)
MAIN (Power)
MAIN (Power)
MAIN (Power)
MAIN (Power)
MC
MC
MC
ASIC
Sync
Sync
Controller- IC
M3.3/D3.3V- controller- Tr
M3.3/D3.3V- generator- IC
D2.5V- generator- IC
A2.5V- generator- IC
P2.5- generator- IC
EEPROM (for adjustment)
Reset IC
MPU
ASIC
DVI-A- IC
D-SUB- IC
12V-OVP Circuit
----------
POWER
Power Chopper
Circuit
----------
MAIN (POWER)
Inverter Circuit
----------
INVERTER
DC12V
Voltage
DC12V Line Circuit / Schematic Diagram
DC3.3V
(M3.3V)
DC3.3V
(D3.3V)
Voltage
M3.3V / D3.3V Line Circuit
D2.5V
Generating
Circuit
----------
MAIN
(POWER)
D2.5V
generating
Circuit
----------
MAIN
(POWER)
A2.5V
Generating
Circuit
----------
MAIN
(POWER)
A2.5V
generating
Circuit
----------
MAIN
(POWER)
P2.5V
Generating
Circuit
----------
MAIN
(POWER)
P2.5V
generating
Circuit
----------
MAIN
(POWER)
MPU
(MAIN)
----------
MAIN
(MC)
ASIC
----------
MAIN
(ASIC)
DDC
Circuit
----------
MAIN
(MC)
SYNC
(DVI-A)
Circuit
----------
MAIN
(SYNC)
EEPROM
(for
adjustment)
----------
MAIN
(MC)
SYNC
(D-SUB)
Circuit
----------
MAIN
(SYNC)
Asset 5V
Detecting
Circuit
----------
MAIN
(MC)
SW/LED
Circuit
----------
MAIN(MC)
[M3.3V / D3.3V Line Circuit]
[DC12V Line Circuit]
Summary of Contents for LCD1550X-BK
Page 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5 ...
Page 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B ...
Page 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Page 100: ...SCHEMATIC DIAGRAM POWER LCD1550X ...
Page 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X ...
Page 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X ...
Page 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
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