GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 37 (112)
GA 628
Measure the voltages at the display pads H624 (fig. 5.10):
Table 5.3
• If VLCD is incorrect, proceed to section 5.3.
• If the I
2
C-DATA or the I
2
C-CLOCK voltages are missing, check VDIG (~3.2V).
* If VDIG is incorrect, proceed to chapter 3 (“Doesn’t start”-fault).
* If VDIG is correct, measure the resistances of R619 (class A, 2.2 kohms),
R620 (class A, 2.2 kohms), R678 (class A, 10 kohms) and R679 (class A, 10
kohms). Make sure the solderings at D600 pads 3 and 4 are correct.
* If the resistances and the solderings are correct, replace D600 (class B).
If the problem isn’t solved, send the phone to the next level.
Note: Fig. 5.4, 5.6 and 5.9 are not in this document.
Pad # Used for Voltage
1 VLCD ~5.4V
2 GND 0V
3 VDIG ~3.2V
4 VDIG ~3.2V
5
I
2
C Data
~3.2V
6
I
2
C Clock
~3.2V
To Next Page
Loading...
