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BD-HP75U
Flowchart 8
Is LCD1301 (LCD unit) cracked or otherwise damaged?
Are there SEG and COM input signals at LCD1301?
Are signals and power applied at pins 36 (reset), 37 (5V), 42
(LCD_CS), 43 (LCD_CLK) and 44 (LCD_DATA) of IC1301 (LCD
driver)?
Are there output signals at pins 3 (LCD_CLK), 4 (LCD_DATA), 6
(LCD_RST) and 7 (LCD_CS) of IC2501 (front microprocessor)?
Check R2501, R2502, R2505, R2536 and IC2501 as well as their
peripheral circuits. Replace as required.
Flowchart 9
Is the collector of Q1305 (backlight switch) at 0V level?
Is there 3.3V input at the base of Q1305?
Is there 3.3V output coming from pin 33 (BL_LCD) of IC2501 (front
microprocessor)?
Check IC2501 and its peripheral circuits. Replace as required.
No LCD display.
NO
NO
NO
NO
LCD backlight failure to light up.
NO
NO
NO
YES
Replace LCD1301.
YES
Check the soldering condition of LCD1301. Replace as required.
Check IC1301 and its peripheral circuits. Replace as required.
YES
YES
Check SC1301, FFC harness and CN2501. Replace as required.
YES
Check D1303, D1305, R1321 and R1323 as well as their periph-
eral circuits. Replace as required.
YES
Check Q1305. Replace as required.
YES
Check SC1301, FFC harness and CN2501. Replace as required.
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