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LC-32DH57E-BK/RU-BK/S-BK

4 – 1

LC-32DH57E-BK

Service Manual

 

YES

Is the power cord connector, AC-IN harness, and PD harness 
connected to the POWER unit normally? 

NO

Reconnect the power cord, the AC-IN harness and PD harness cor-
rectly.

YES

Is the connection of B to B connector between the POWER 
unit and the INVERTER unit normal? (P7201-CN7302)

NO

Correct connection or the short circuit of a B to B connector nor-
mally. (P7201-CN7302)

YES

Are F7001 (3.15A) and F7002 (3.15A) normal?

NO

Replace F7001 or F7002 and switch on the power again. 
If Fuse still blow out, check L7001, L7002, D7104, VA7001, and 
VA7002.

YES

Is DC310V supplied to the primary side capacitor C7114 and 
C7108, when the power switch is turned on?

NO

Check whether there are any abnormalities in a rectification circuit. 
(D7104, C7114, C7108, L7101) 

YES

Is UR12.5V supplied from pin (13) (14) of PD connector 
(P7202), when the power switch is turned on?

YES

(*1) fly to the check item of INV60V.

NO

Is about DC400V supplied to primary side capacitor C7112?

NO

Check whether there are any abnormalities in a power factor 
improvement circuit. (IC7101, Q7103, D7113, D7213)

YES

Check whether the PS_ON “H” signal is inputted to the pin (6) 
of PD connector (P7202) in the power supply unit.

NO

Check whether the PS_ON “H” signal is outputted to pin (10) of PD 
connector (P9601) and pin (AC11) of IC3303 (VCT) in the MAIN unit.

YES

Check again after remove parts which have trouble or a short 
circuit. Is UR12.5V supplied from pin (13) (14) of PD connec-
tor (P7202)?

NO

Is there a part which breaks down on the UR12.5V line or short-cir-
culated?

YES

YES

NO

Check the power control circuit of UR12.5V.
(IC7201, T7206, D7217, C7220, C7222, C7228, D7215)

Check again after remove parts which have trouble or a short circuit. 

After the power supply is turned on, is INV60V generated in 
connector P7201 (20-23) pin? (*1)

NO

Is connector CN7302 of the INV unit removed, and is INV60V gener-
ated in connector P7201 (20-23) pin?

YES

YES

NO

Check the inverter power circuit of INV60V.
(D7227, C7221, C7223, T7206, D7220, D7221)

It is failure inside an INV unit. check broken parts or a shorting part.
(Q7809, Q7807, Q7811, Q7810, etc.)

Is BU3.3V/D3.3V supplied to pin (5) (6) of RA connector 
(P3301) in a main unit, and pin (1) (2) of P101 in the R/C unit?

NO

Check the power supply circuit of BU3.3V and D3.3V.
(IC9605, IC9607/IC9602, etc.)

YES

“No power supplied (Front LED does not light up)”. “No 
power-up even if turned on (Front LED light up).” Is it OK?

NO

Review the former step and check it again.

LC-32DH57E-BK/RU-BK/S-BK

4 – 2

                                                
The power supply of TUNER (TU1102) does not operate.
(IF5V)

                                                
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 IF5V supplied to pin (3) of TUNER (TU1102)?

YES

Check the soldering of TUNER (TU1102), confirm I2C-LINE or 
exchange it. 

NO

Is D5V output from pin (3) of IC9608 (D5V-REG)? 

YES

Check the soldering of Q1105 and TUNER (TU1102).

NO

Is UR12.5V supplied to pin (2) of IC9608 (REG)?

NO

Check the pin (1) (2) of connector PD (P9601). 

 YES

Check whether D_POW “H” signal is input to pin (7) of IC9608?

YES

Check soldering IC9608 (D5V-REG) or exchange it. 

NO

Check whether PS-ON “H” signal is input to pin (2) of IC3305?

YES

Check soldering IC3305 (V-DET) or exchange it.

NO

Check whether PS-ON “H” signal is outputted from pin (AC11) of 
IC3303.

LC-32DH57E-BK/RU-BK/S-BK

4 – 3

                                               
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)?

NO

Check whether BU3.3V is outputted from pin (3) of IC9605 
(REG). 

YES

NO

Check whether the voltage detection signal input from IC9607 (V-
DET) (1) pin to IC9605 (7) pinis.

Is D3.3V, D1.1V, and CPU1.2V supplied to pin (F18) (C6) (K12) 
of IC3303 (VCT). 

NO

Are D3.3V, D1.1V, and CPU1.2V output from IC9602 (SW) (1) 
pin, IC9604 (REG) (3) pin, and IC9603 (REG) (5) pin?

YES

NO

Check soldering and the peripheral circuit of IC3303 (VCT).
Or please exchange IC3303.

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.

                                               
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)?

NO

Is S12.5V input to pin (3) (4) of PD connector (P9601)?

YES

NO

Check a soldering or contact of a PD connector (P9601).

Is D3.3V supplied to pin (3) of IC1302 (A-SW), and is S9V sup-
plied to pin (10)?

NO

Check whether D3.3V is outputted from pin (1) of IC9602 (SW), 
and S9V is outputted from pin (5) of IC9610 (REG).

NO

Check whetherD1.1V_ON signal is inputted to pin (3) of IC9602 
(SW) and pin (3) of IC9610 (REG).

LC-32DH57E-BK/RU-BK/S-BK

4 – 4

                                                
The power supply of a PANEL system does not operate.
(Q9606) (LCD12V) 

                                                
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.

 YES

Is LCD12V supplied to pin (12)-(15) of LP connector (P2604)? 

YES

Replace LCD-CONT-UNIT. 

NO

Is LCD12V output from pin (8) of Q9606 (SW)? 

YES

Check the surrounding of LP connector (P2604). 

NO

Is UR12.5V input to pin (1) of Q9606 (SW)?

NO

Check whether UR12.5V is input to pin (1) (2) of PD connector 
(P9601). 

 YES

Is PNL_POW “H” input to pin (4) of Q9606 (SW)?

NO

Check whether PNL_POW signal outputs “H” from pin (A12) of 
IC3303.

 YES

Replace Q9606 (SW).