BD-HP22SB
4 – 6
The LCD display fails to light up.
Is the LCD unit cracked or otherwise damaged?
NO
NO
Check all the signal lines between SC1101 and IC1101.
Replace LCD1101.
Are there the following inputs to the following pins: 5V 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: 5V at
pin (8), LCD_CS at pin (11), LCD_DATA at pin (18),
LCD_CLK at pin (9) and LCD_RST at pin (12), all on SC1101?
Check IC1101 and its peripheral circuits. Or replace IC1101 as
required.
YES
YES
Check the connection between SC2501 and CN1101.
YES
Is the display-designated SEG or COM signal inputted to
LCD1101?
YES
Replace LCD1101.
YES
NO
Are the signals outputted from pins (1 thru 17, 33, 34 and 35)
of IC1101?
Check the pattern between IC1101 and LCD1101.
YES
NO
Are there the following inputs to the following pins: 5V at pin
(14), LCD_CS at pin (11), LCD_DATA at pin (13), LCD_CLK
at pin (12) and LCD_RST at pin (10), all on SC2501?
NO
Check the following signal flows:
LCD_DATA; Pin (1) of IC2504 to pin (13) of CN2502
LCD_CLK; Pin (2) of IC2504 to pin (12) of CN2502
LCD_RST; Pin (3) of IC2504 to pin (10) of CN2502
LCD_CS; Pin (47) of IC2504 to pin (11) of CN2502
Check also IC2504 and its peripheral circuits.
NO
Is the 5V signal fed to pin (14) of SC2501?
NO
Check the SUB_PC_5V line.
FLOW CHART No.2
The LCD backlight fails to light up.
Is the "H" voltage applied at the non-base-connected side of
Q1107 on R1138?
NO
NO
Check the pattern between pin (13) of SC1101 and R1138.
Is the "H" potential outputted from pin (40) (LED_BL_LCD) of
IC2504?
Check IC2504 and its peripheral circuits.
Or replace IC2504 as required.
Check the line between pin (40) of IC2504 and pin (9) of SC2501.
YES
Is the "H" potential applied at pin (13) (BL_LCD) of SC1101?
YES
Check Q1107, LED and the current-limiting resistor.
YES
NO
Is the "H" potential applied at pin (9) (BL_LCD) of SC2501?
Check the FFC between SC1101 and SC2501.
YES
NO
FLOW CHART No.3
