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LC-32DH57E/RU/S
Power supply (troubleshooting): A power supply does not come to each main circuit/IC. (1)
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)?
Is D5V output from pin (3) of IC9608 (D5V-REG)?
Is UR12.5V supplied to pin (2) of IC9608 (REG)?
Check whether D_POW "H" signal is input to pin (7) of IC9608?
Check whether PS-ON "H" signal is input to pin (2) of IC3305?
Check whether PS-ON "H" signal is outputted from pin (AC11) of
IC3303.
NO
NO
YES
NO
NO
YES
Check the soldering of TUNER (TU1102), confirm I2C-LINE or
exchange it.
YES
Check the soldering of Q1105 and TUNER (TU1102).
NO
Check the pin (1) (2) of connector PD (P9601).
YES
Check soldering IC9608 (D5V-REG) or exchange it.
YES
Check soldering IC3305 (V-DET) or exchange it.
4 – 2
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