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LC-19D1E/S-BK/WH
4 – 4
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (4)
The power supply of a PANEL system does not operate.
Checklist:
1) The check of the front page POW (1) is completed.
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
Is B12V output from pin(6) of Q702(SW)?
NO
Check the soldering of Q702(SW) or exchange it.
YES
Is VGL(-7V)/VGH (28V) output from pin(1)/(3) of IC704(SW-
REG)?
REG)?
NO
Check the soldering of Q704(SW-REG) or exchange it.
YES
Is VLSB14.6V output from pin(3) of IC701 (VLSB14.6V-REG)?
NO
Check the soldering of IC701(VLSB12V-REG) or exchange it.
YES
Is VH24/VH56/VL 56/VL24 output from pin(7)/(1)/(8)/ (14) of
IC1001(OP-AMP)?
IC1001(OP-AMP)?
NO
Check the soldering of IC1001(OP-AMP) or exchange it.
YES
Is COM-BIAS output (4.2V) from pin(7) of IC9202(COM-BIAS)?
NO
Check the soldering of IC9202(COM-BIAS) or exchange it.
YES
Is each voltage supplied to SC9201(CONN) ?
(VLSB14.6V,VGH,VGL,COM-BIAS)
(VLSB14.6V,VGH,VGL,COM-BIAS)
NO
Check the soldering of SC9201(CONN) or exchange it.
YES
Check the FPC of PANEL or exchange PANEL-MODULE.
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