Sharp LC-32DH57E-BK Service Manual page 29

Power supply (troubleshooting): A power supply does not come to each main circuit/IC. (2)
The power supply of a VIDEO system does not operate.
(IC3303)
(BU3.3V), (D3.3V), (D1.1V), (CPU1.2V)
Checklist
1) The check of the front page POW-UNIT is completed. ••• UR12.5V is output to PD (P9601) (MAIN-UNIT).
(If UR12.5V is not output, confirm the POW-UNIT again and repair.)
2) Check that STB3.3V is supplied to pin (V24) of IC3303 (included MICON), and the PS_ON signal "H" is output from (AC11) pin within a MAIN
UNIT.
(If STB3.3V is not supplied, check IC9605 (BU3.3V-REG), IC9607 (V-DET), and a peripheral circuit.)
3) Refer to attached sheet SYSTEM Block diagram.
4) Attention: The terminal of IC3303 (VCT) cannot be actually checked by hiding oneself, and check it with another terminal of the same line,
please.
Is BU3.3V supplied to pin (V24) of IC3303 (VCT)?
Is D3.3V, D1.1V, and CPU1.2V supplied to pin (F18) (C6) (K12)
of IC3303 (VCT).
Check soldering and the peripheral circuit of IC3303 (VCT).
Or please exchange IC3303.
Power supply (troubleshooting): A power supply does not come to each main circuit/IC. (3)
The power supply of a AUDIO system does not operate.
(IC1302/IC2701)
(AMP12.5V, S9V, D3.3V)
Checklist
1) The check of the front page POW-UNIT is completed. ••• UR12.5V is output to PD (P9601) (MAIN-UNIT).
(If UR12.5V is not output, confirm the POW-UNIT again and repair.)
2) Check that STB3.3V is supplied to pin (V24) of IC3303 (included MICON), and the PS_ON signal "H" is output from (AC11) pin within a MAIN
UNIT.
(If STB3.3V is not supplied, check IC9605 (BU3.3V-REG), IC9607 (V-DET), and a peripheral circuit.)
3) Refer to attached sheet SYSTEM Block diagram.
4) Attention: The terminal of IC3303 (VCT) cannot be actually checked by hiding oneself, and check it with another terminal of the same line,
please.
Is AMP12.5V supplied to pin (1) (10) of IC2701 (A-AMP)?
Is D3.3V supplied to pin (3) of IC1302 (A-SW), and is S9V sup-
plied to pin (10)?
YES
YES
YES
NO Check whether BU3.3V is outputted from pin (3) of IC9605
(REG).
Check whether the voltage detection signal input from IC9607 (V-
DET) (1) pin to IC9605 (7) pinis.
NO Are D3.3V, D1.1V, and CPU1.2V output from IC9602 (SW) (1)
pin, IC9604 (REG) (3) pin, and IC9603 (REG) (5) pin?
Check whether the D_1.1V signal inputs to IC9602 (SW) (3) pin
and D_POW signal inputs to IC9604 (REG) (7) pin or check sol-
dering etc.
NO Is S12.5V input to pin (3) (4) of PD connector (P9601)?
Check a soldering or contact of a PD connector (P9601).
NO Check whether D3.3V is outputted from pin (1) of IC9602 (SW),
and S9V is outputted from pin (5) of IC9610 (REG).
Check whetherD1.1V_ON signal is inputted to pin (3) of IC9602
(SW) and pin (3) of IC9610 (REG).
4 – 3
LC-32DH57E-BK/RU-BK/S-BK
NO
NO
NO
NO