Table of Contents
Advertisement
No further action should be taken for a liquid damaged telephone.
If VBATT occurs on both sides of the diodes, then it is most likely a short cut in one of the
LED´s or a foil damage between the diode cathodes and the resistor R660.
It can also be caused by a damage in R660, V613 or R607.
26.3 The LED´s at the keyboard H655-H660 and H663-H666
are not working
If one LED does not work, it is almost always that one that is faulty.
There is also possible that there is a damage on the board between the pads under nearby lying
diodes.
No further action should be taken for a liquid damaged telephone.
If a replacement of a diode did not help, measure the voltage over it, +4.8 V
side and +2.8 V
If the voltages are correct then the diodes are faulty.
If VBATT are missing there is a foil damage, possibly caused by a liquid damages.
No further action should be taken for a liquid damaged telephone.
If VBATT occurs on both sides of the diodes, then it is most likely a short cut in one of the
LED´s or a foil damage between the diode cathodes and V614.
It can also be caused by a damage in V614 or R610.
26.4 No LED at all is working
If no LED works, measure the voltage on R608 +1.8 V
If the voltage is incorrect it can depend on either D600, no signal LED3K +3.1 V
at R608, R607 or a possible foil damage.
If the voltage is correct the fault can be due to missing VBATT at all the LED´s, foil damage,
or at least two of the following components are damaged: R609, R610, V613, V614.
4/00021-3/FEA 209 544/18 B
on the other side.
DC
Trouble Shooting Guide, Advanced
DC
.
DC
VBATT on one
,
DC
110(121)
Advertisement
Table of Contents
