Sharp LC-32DH57E-BK Service Manual page 30

LC-32DH57E-BK/RU-BK/S-BK
Power supply (troubleshooting): A power supply does not come to each main circuit/IC. (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.
Is LCD12V supplied to pin (12)-(15) of LP connector (P2604)?
Is LCD12V output from pin (8) of Q9606 (SW)?
Is UR12.5V input to pin (1) of Q9606 (SW)?
Is PNL_POW "H" input to pin (4) of Q9606 (SW)?
Replace Q9606 (SW).
YES
NO
NO
YES
YES
YES Replace LCD-CONT-UNIT.
YES Check the surrounding of LP connector (P2604).
NO Check whether UR12.5V is input to pin (1) (2) of PD connector
(P9601).
NO Check whether PNL_POW signal outputs "H" from pin (A12) of
IC3303.
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