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If:
1. RESETO (3.2V) is incorrect, measure the resistance from the pad to pin 77 of
D600 (0 ohms). Also check the soldering at that pin. If the resistance is substan-
tially higher there's a foil damage and the phone should be discarded. If the
resistance is correct, replace D600 (class B).
2
2. I
CCLK (3.2V) is incorrect, measure the resistance from the pad to pin 4 of
D600 (10 kohms). If it's higher, measure the resistance of R615 (10 kohms, class
A). If the resistance of R615 is correct there's a foil damage and the phone
should be discarded. Check VDIG (3.2V) at R620 (2.2 kohms, class A). If it is
too low, proceed to chapter 3 ("Doesn´t start"-fault). If all of the above is correct,
replace D600.
3. GND is incorrect, i.e. there is too high resistance from the pad to ground, there's
a foil damage and the phone should be discarded.
4. VDLCD (3.2V) is incorrect, measure the resistance from the pad to pin 45 of
D600 (0 ohms). If it's higher there's a foil damage and the phone should be dis-
carded. If it's correct, measure the resistance from the pad to ground (>2.5
Mohms). If it's incorrect, replace C615 and C674 (both of them class A). If that
doesn't help, replace D600 (class B).
5. VLCD (-2.7V) is incorrect, make sure that VDIG at N702 pin 5 is 3.2V. Measure
the resistance from the pad to pin 1 of V611 (0 ohms). If it's too high there's a
foil damage and the phone should be discarded. Check the solderings at D600
pins 95 and 96. Measure the voltages at V611 (pin 1: -2.7V, pin 2: -1.6V, pin 3:
-2.5V) and V608 (pin 1: -1.6V, pin 2: 0V, pin 3: -1.0V). If any of the voltages are
incorrect, replace the corresponding diode and try again. If the problem still
remains, measure the resistances of C632, C634, C636 (>2.5 Mohms), C631,
C633 (>100 kohms) and C824 (>25 kohms). If any of the resistances are incor-
rect, replace the corresponding capacitor (all of them class A). Also measure the
resistances of R615, R639 (100 kohms), R807 (82 kohms) and R808 (33 kohms).
If any of the resistances are incorrect, replace the corresponding resistor (all of
them class A). If the fault remains, replace D600 (class B).
2
6. I
CDAT (3.2V) is incorrect, measure the resistance from the pad to pin 3 of
D600 (10 kohms). If it's higher, measure the resistance of R614 (10 kohms, class
A). If it's correct there's a foil damage and the phone should be discarded. Check
if there's VDIG voltage (3.2V) at R619 (2.2 kohms, class A). If the voltage is
lower, proceed to chapter 3 ("Doesn´t start"-fault). If all of the above is correct,
replace D600 (class B).
If the fault isn't fixed, send the phone to the next level.
4/00021-2/FEA 209 544/3.D
SH888, S868, Standare Electrical Repair
27
(66)
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