Each CMT-display and keypad LED has its own driver. If there is problems with one or more
- Keypad-LED: check resistors R203-R208, transistors V213, V203, V204 and the LEDs.
- CMT-LED: check resistors R200-R202, transistor V206 and the LEDs.
If the illumination does not work at all, measure voltages VB and KBLIGHTS. VB should be the same as VBATT and KBLIGHTS approximately 2.5V when the LEDs are supposed to be on. If these voltages are not correct, problem is in hinge flex, connector X001 or on KL8 (see 2.23 in this document).
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