Main Keypad Illumination Problems - Siemens S75 Service Repair Documentation

12 Main keypad illumination Problems

Fault Symptoms
Customer:
Main keypad illumination does not work
Exchange
keypad LED's
LED WHITE TOP
Use soldering iron to remove defective component. Avoid excessive heat! Watch surrounding
components! Resolder new component afterwards.
Attention: Remove Metal Dome Sheet before!!!
E-commerce order number: L36840-L2099-D670
E-commerce order name:
Soldering temperature:
IRIS Diagnose Code:
Technical Documentation
TD_Repair_L2.5L_S75_R1.0.pdf
Led's Problems
Watch for oxidation and
damaged pads of the
LED's
not
okay Check the status of the
battery connector
visually
not
okay
Use the diode test
function of a multimeter
to check the status of
the diode. The typical
voltage drop on the
diode is 1.7 V when
testing the diode
function with the
multimeter.
LED WHITE TOP
~ 360°C TIP Temp.
36000 Keys/Illumination
Company Confidential
GRT:
Current measured failed
not
okay
okay
okay
2005©BenQ
Back to customer
without repair
caused by customer
SCRAP - has to be send
separately to WSC
- check for twisted or
bent contacts
- check for dry joints
Continue with
higher repair level
Page 15 of 15
Release 1.0
10/2005