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Troubleshooting Symptom Charts/Video - 16
Backlight doesn’t
operate.
1 Verify that backlight cable connection is secure.
2 Check cable, inverter board, and logic board connections.
3 Verify that cables are not pinched or severed.
4 Replace inverter board (CPRC/Int’l only).
5 Replace display.
6 Replace logic board.
Note:
When replacing the logic board, check that the serial port
EMI clip is attached to the bottom of the CPU stiffener. If it is
missing, replace the stiffener. On international units, also
replace the stiffener if the modem EMI clip is missing. The “CPU
Stiffener” topic in Take Apart helps you locate and identify the
two EMI clips.