26
BDP-120
1
2
3
4
A
B
C
D
E
F
1
2
3
4
The LCD display fails to li
g
ht up.
Is the LCD unit cracked or otherwise damaged?
N
O
N
O
Check all the signal lines between SC1101 and IC1101.
Replace LCD1101.
Are there the following inputs to the following pins: 5
V
at pin
(37), LCD_RST at pin (36), LCD_CS at pin (42), LCD_CLK at
pin (43) and LCD_DATA at pin (44), all on IC1101?
Are there the following outputs from the following pins: 5
V
at
pin (1), LCD_CS at pin (10), LCD_DATA at pin (12),
LCD_CLK at pin (11) and LCD_RST at pin (7), all on SC1101?
Check IC1101 and its peripheral circuits. Or replace IC1101 as
required.
YES
YES
Check the connection between C
N
2501 and C
N
1101.
YES
Is the display-designated SEG or COM signal inputted to
LCD1101?
YES
Replace LCD1101.
YES
N
O
Are the signals outputted from pins (1 thru 17, 33, 34 and 35)
of IC1101?
Check the pattern between IC1101 and LCD1101.
YES
N
O
Are there the following inputs to the following pins: 5
V
at pin
(1), LCD_CS at pin (10), LCD_DATA at pin (12), LCD_CLK
at pin (11) and LCD_RST at pin (7), all on C
N
2501?
N
O
Check the following signal flows:
LCD_DATA; Pin (99) of IC2503 to pin (12) of C
N
2501
LCD_CLK; Pin (100) of IC2503 to pin (11) of C
N
2501
LCD_RST; Pin (1) of IC2503 to pin (7) of C
N
2501
LCD_CS; Pin (45) of IC2503 to pin (10) of C
N
2501
Check also IC2503 and its peripheral circuits.
N
O
Is the 5
V
signal fed to pin (1) of C
N
2501?
N
O
Check the AT_5
V
line.
FLOW CHART No.2
The LCD backli
g
ht fails to li
g
ht up.
Is the "H" voltage applied at the non-base-connected side of
Q1107 on R113
Check the pattern between pin (6) of SC1101 and R113
8
.
Is the "H" potential outputted from pin (3
8
) (LED_BL_LCD) of
IC2503?
Check IC2503 and its peripheral circuits.
Or replace IC2503 as required.
Check the line between pin (3
8
) of IC2503and pin (6) of C
N
2501.
YES
Is the "H" potential applied at pin (6) (BL_LCD) of SC1101?
YES
Check Q1107, LED and the current-limiting resistor.
YES
N
O
Is the "H" potential applied at pin (6) (BL_LCD) of C
N
2501?
Check the FFC between SC1101 and C
N
2501.
YES
N
O
FLOW CHART No.3
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