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BD-HP17U
FLOW CHART No. 2
Is the LCD unit cracked or otherwise damaged?
Is the display-designated SEG or COM signal inputted to
LCD1101?
Are the signals outputted from pins (1 thru 17, 33, 34 and 35)
of IC1101?
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 (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?
Are there the following inputs to the following pins: 5V 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 CN2501?
Check the following signal flows:
LCD_DATA; Pin (99) of IC2503 to pin (12) of CN2501
LCD_CLK; Pin (100) of IC2503 to pin (11) of CN2501
LCD_RST; Pin (1) of IC2503 to pin (7) of CN2501
LCD_CS; Pin (45) of IC2503 to pin (10) of CN2501
Check also IC2503 and its peripheral circuits.
FLOW CHART No. 3
Is the "H" voltage applied at the non-base-connected side of
Q1107 on R1138?
Is the "H" potential applied at pin (6) (BL_LCD) of SC1101?
Is the "H" potential applied at pin (6) (BL_LCD) of CN2501?
Is the "H" potential outputted from pin (38) (LED_BL_LCD) of
IC2503?
Check IC2503 and its peripheral circuits.
Or replace IC2503 as required.
The LCD display fails to light up.
NO
NO
NO
NO
NO
NO
The LCD backlight fails to light up.
NO
NO
NO
NO
YES
Replace LCD1101.
YES
Replace LCD1101.
YES
Check the pattern between IC1101 and LCD1101.
YES
Check IC1101 and its peripheral circuits. Or replace IC1101 as
required.
YES
Check all the signal lines between SC1101 and IC1101.
YES
Check the connection between CN2501 and SC1101.
Is the 5V signal fed to pin (1) of CN2501?
Check the AT_5V line.
YES
Check Q1107, LED and the current-limiting resistor.
YES
Check the pattern between pin (6) of SC1101 and R1138.
YES
Check the FFC between SC1101 and CN2501.
YES
Check the line between pin (38) of IC2503 and pin (6) of CN2501.
4 – 7
NO
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