LL-T180A (serv.man2). Outline, Disassembly, Adjustment Troubleshooting - Sharp Monitor Service Manual (repair manual). Page 17

No power supply

LED comes on in green when
power switch is turned on?

No

Yes

LED comes on in red.

LED comes on in orange

Replace any defective component parts
(main PWB, SW PWB, cables)

Check whether sync. signal is output from
D-sub board.

Replace D-sub board.

Check that:
• LED is broken.
• CN7 (1st pin) to IC34 (52nd pin) for proper
   routing
• Cables for disconnection

Check whether:
• The monitor is not in power save mode
  (no sync. signal input).
  1  The computer is not turned OFF.
  2  The RGB cable is disconnected.
  3  The sync. signal is output from the RGB
       cable.

Yes

Yes

No

No

No

Yes

No

Check power input system.
  1  AC adapter
      • Normal?
      • Connected properly?
  2  Fuse (DC jack PWB)
     • Blown
  3  Microprocessor (IC34)
     • +5V (MVCC) ?
  4  LED
    • LED is broken?
    • CN7 (1st pin) -> IC34 (52nd pin)
    • CN7 (2nd pin)  -> IC34 (51st pin)
    • Cable is disconnected?

1

Replace any defective unit:
(  1  AC adapter,  2  DC jack PWB,
   3  main PWB,   4  switch PWB)