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LC
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32DH57E-BK/RU-BK/S-BK
4 – 4
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.
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).