Read Sharp LC-19D1EBK (serv.man5) Service Manual online
LC-19D1E/S-BK/WH
4 – 2
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (2)
The power supply of a VIDEO system/IC801 (DVP) 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 B1.5V supplied to pin(D12) of IC801 (DVP) ?
NO
Check whether B1.5V is output from pin(6) of IC705.
YES
NO
Check whether POWER-CTL signal is input to pin(4) of IC705
(REG).
(REG).
YES
Is B12V supplied to pin(5) of IC705 (REG) ?
YES
Exchange IC705 (REG).
Is B3.3V supplied to pin(R19)(D5) of IC801(DVP) ?
NO
Check whether B3.3V is output from pin(3) of IC703 (REG).
YES
NO
Check whether UR 12V-CTL signal is input to pin(7) of
IC703(REG).
IC703(REG).
YES
Is B12V supplied to pin(2) of IC703 (REG) ?
YES
Exchange IC703 (REG).
Is B3.3V supplied to pin(1)(19) of IC9201 (RSDS-TR) ?
NO
Check whether B3.3V is output from pin(3) of IC703 (REG).
YES
NO
Check the soldering of IC801 and IC703 or exchange it.
Check whether UR 12V-CTL signal is input to pin(7) of
IC703(REG).
IC703(REG).
YES
Is B12V supplied to pin(2) of IC703 (REG) ?
YES
Exchange IC703 (REG).
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