Sharp BD-HP21H (serv.man2) Service Manual ▷ View online
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 8
[3] OPERATION
(BD-HP21 Series)
The remote controller does not function.
The main unit controls function, but the remote controller
controls fail to function.
controls fail to function.
YES
YES
Check the line between pin (1) of RMC1201 and pin (25) of IC2504.
Check the remote control codes 1, 2 and 3.
Using the remote controller, is the "L" pulse signal outputted
from pin (1) of RMC1201?
from pin (1) of RMC1201?
Is the "L" pulse signal inputted to pin (25) of IC2504?
Replace RMC1201 or the remote control receiver.
NO
NO
Is the remote control code as specified?
NO
YES
Is the 5V voltage applied to pin (3) of the RMC1201 remote
control receiver?
control receiver?
Check the AT_5V line.
NO
YES
Check IC2504. Replace it as required.
YES
FLOW CHART No.1
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 9
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?
(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?
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.
required.
YES
YES
Check the connection between SC2501 and CN1101.
YES
Is the display-designated SEG or COM signal inputted to
LCD1101?
LCD1101?
YES
Replace LCD1101.
YES
NO
Are the signals outputted from pins (1 thru 17, 33, 34 and 35)
of IC1101?
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?
(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 (4) of IC2504 to pin (11) of CN2502
Check also IC2504 and its peripheral circuits.
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 (4) 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
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 10
The LCD backlight fails to light up.
Is the "H" voltage applied at the non-base-connected side of
Q1107 on R1138?
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?
IC2504?
Check IC2504 and its peripheral circuits.
Or replace IC2504 as required.
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
The LED power indicator fails to light up.
Is the power as specified?
YES
NO
Check each transistor, LED and the current-limiting resistor.
Is there the "H" potential at pin (18) (LED_STBY) or pin (17)
(LED_PON) of SC2501?
(LED_PON) of SC2501?
Is the "H" potential outputted from pin (53) (LED_STBY) or pin
(51) (LED_PON) of IC2504?
(51) (LED_PON) of IC2504?
Check the FFC between SC1101 and SC2501.
YES
Check the line between IC2504 and SC2501.
YES
Is the "H" potential applied at the base of Q1111 or Q1112?
YES
POWER FLOW CHART No.1 or POWER FLOW CHART No.3
NO
NO
Check IC2504 and its peripheral circuits. Or replace IC2504 as
required.
required.
NO
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PON) of SC1101?
(LED_PON) of SC1101?
Check the line between SC1101 and the base of each transistor.
YES
NO
FLOW CHART No.4
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 11
The LED mode display indicator fails to light up.
* White LED: Blinking while the disc is being loaded.
* White LED: Blinking while the disc is being loaded.
Lights up when the disc has been recognized.
* Blue LED:
While the disc is being played back.
Is the "H" potential applied at the base of Q1104 or Q1105?
NO
NO
Check the line between SC1101 and the base of each transistor.
Is there the "H" potential output from the following pins in each
mode: Pin (54), (LED_BD_MODE), pin (57) (LED_DVD_
MODE), pin (55) (LED_BD_PLAY) or pin (58) (LED_DVD_
PLAY), all on IC2504?
mode: Pin (54), (LED_BD_MODE), pin (57) (LED_DVD_
MODE), pin (55) (LED_BD_PLAY) or pin (58) (LED_DVD_
PLAY), all on IC2504?
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
as required.
Check the line between IC2504 and SC2501.
YES
Is there the "H" potential at pin (18) (LED_BD_MODE) or pin
(17) (LED_BD_PLAY) of SC1101?
(17) (LED_BD_PLAY) of SC1101?
YES
Check each transistor, LED and the current-limiting resistor.
YES
NO
Is there the "H" potential at pin (5) (LED_MODE_R) or pin (4)
(LED_PLAY_R) of SC2504?
(LED_PLAY_R) of SC2504?
Check the FFC between SC1101 and SC2501.
YES
NO
FLOW CHART No.5
A button fails to work.
Is the button switch contact and tightness as specified?
YES
YES
Check the line between each button and IC2504. Or check the
pull-up resistor at pin (74) or (75) of IC2504. (R2578, R2507)
pull-up resistor at pin (74) or (75) of IC2504. (R2578, R2507)
Is the control voltage properly applied at pin (74) (KEY_EJCT)
and pin (75) (KEY_STBY) of IC2504? (While the relevant
button is held down, the "H" level changes to "L" level.)
and pin (75) (KEY_STBY) of IC2504? (While the relevant
button is held down, the "H" level changes to "L" level.)
NO
Check the relevant switch. Replace it as required.
NO
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
as required.
FLOW CHART No.6
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