LC-32DH57E (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 4

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

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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).