2
MPU may have any problem.
NO
NO
NO
YES
Is control
pulse for
brightness of
back light
input into #7 of
J703?
Is DC2.5V (D2.5V)
output from #8 of
IC602?
ASIC may have any problem.
YES
YES
Is approx. 3.3V
input #5 of J703?
IC602
IC400
D2.5V line may have any problem. Please check the parts
below.
MAIN (Power)
ASIC
D2.5V- generator- IC
ASIC
Please check the part below.
MPU
IC102
MC
Please check the part below.
ASIC
IC400
ASIC
LCD panel
(back light)
Q701
Q702
Q703
Q704
T701
T702
Q707
D707
D717
D718
D719
D720
IC701
IC702
Q717
Q718
Q711
TH701
IC102
Protection circuit in inverter circuit may have any problem.
Please check the parts below.
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
MC
Output- Tr
Output- Tr
Output- Tr
Output- Tr
Output- trans
Output- trans
12V-OVP- Tr
12V-OVP- zener diode
Output- F/B- zener diode
Output- F/B- zener diode
Output- F/B- zener diode
Output- F/B- zener diode
Output- F/B- IC
Output- F/B- IC
Abnormal detector- Tr
Abnormal detector- Tr
Abnormal detector- Tr
Abnormal detector- thyristor
MPU
LCD panel
(back light)
F701
F702
Q701
Q702
Q703
Q704
T701
T702
IC703
Inverter drive circuit may have any problem. Please check the
parts below.
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
OCP- fuse
OCP- fuse
Output- Tr
Output- Tr
Output- Tr
Output- Tr
Output- trans
Output- trans
Power output- IC
ASIC
----------
MAIN (ASIC)
DC2.5V
Voltage
D2.5V Line Circuit/Schematic Diagram
2. No Picture
2.1 Back Light Does Not Turn On (POWER-ON INDICATOR (Green) Is Blinking)
[D2.5V 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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