LC-32DH57E (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 2

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

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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.