Ericsson I 888 Trouble-Shooting Instruction page 35

I888, Standard Electrical Repairs
Give the phone power and start it up. If only a few, but not all, LEDs in a group,
H651-H654 (display light) or H655-H660 (keyboard illumination), are not lit
replace them. If H655 and H656 are not lit, measure the resistance of R659 (33
Ohm, class A, Fig 9.3). If a complete group, H651-H654 or H655-H660, are not lit
but the other group are, measure the resistance of one of the LEDs in the group. If
the resistance is lower than 1 MOhm, one of the LEDs are faulty. replace them one
by one until the fault is gone. If the resistance of the LEDs are correct, measure the
35
(42)
4-00021-2/FEA 209 544/5.C