Sharp BD-HP21H (serv.man2) Service Manual ▷ View online
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
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 12
(BD-HP50 Series)
The remote controller fails to function.
The main unit controls function, but the remote controller
controls fail to function.
controls fail to function.
YES
YES
Check the line between J4751 and the terminals on IC4751.
If there is no input at pin (12) of J4751, check J4751 or replace it
as required. Or check the IR receiver in use.
as required. Or check the IR receiver in use.
Check the remote control codes 1, 2 and 3.
Check the AT_5V line.
Are there the inputs at pin (12) (remote control pulse with the
same polarity as at pin (2) of J4751) and at pin (13)
(inverting pulse of the pulse at pin (12)), both on IC4751?
same polarity as at pin (2) of J4751) and at pin (13)
(inverting pulse of the pulse at pin (12)), both on IC4751?
Reposition the polarity change-over switch and check the polarity
again. (S4751)
again. (S4751)
NO
NO
NO
Check IC4751 and its peripheral circuits.
Replace IC4751 as required.
Replace IC4751 as required.
NO
Is the remote control code as specified?
NO
YES
Check the circuit between pins (14) and (1) of IC4751.
Is the signal inputted to pin (1) of IC4751?
NO
YES
Pin (10) of IC4751 at "L": IR receiver
at "H": Main unit receiver
Make sure that when the IR receiver is inserted, pin (10) of IC4751
turns from "H" to "L" level. When fixed at "H" or "L", for example,
check the line between J4751 and pin (10) of IC4751, or replace
J4751 as required. Or check IC4751 and its peripheral circuits and
replace IC4751 as required.
* With the main unit receiver in use
turns from "H" to "L" level. When fixed at "H" or "L", for example,
check the line between J4751 and pin (10) of IC4751, or replace
J4751 as required. Or check IC4751 and its peripheral circuits and
replace IC4751 as required.
* With the main unit receiver in use
Make sure the signal is inputted to pin (2) of IC4751.
Is the signal outputted from pin (15) of IC4751?
NO
Is the "L" pulse signal inputted to pin (25) of IC2504?
YES
YES
YES
Check IC2504 and replace it
as required.
as required.
Check the line between pins
(15) and (2) of IC4751.
(15) and (2) of IC4751.
NO
YES
Using the remote controller, is
the "L" pulse signal is outputted
from pin (1) of RMC1201?
the "L" pulse signal is outputted
from pin (1) of RMC1201?
Check the AT_5V line.
YES
NO
Check the line between pin (1)
of RMC1201 and pin (2) of
IC4751.
of RMC1201 and pin (2) of
IC4751.
Replace RMC1201 or the
remote control receiver.
remote control receiver.
YES
NO
Is the IR receiver used?
YES
Is the signal, which corresponds to the polarity change-over
switch (S4751), outputted from pin (14) of IC4571?
Pin (11) of IC4571 at "L": Input at pin (12)
switch (S4751), outputted from pin (14) of IC4571?
Pin (11) of IC4571 at "L": Input at pin (12)
at "H": Input at pin (13)
No signal is inputted to pin (2) of IC4751.
Is the 5V voltage applied at pin (3) of the RMC1201 remote control
receiver?
receiver?
YES
FLOW CHART No.1 (HP50U only)
With the main unit receiver in use
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 13
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 (HP50X only)
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