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• If the voltage and the resistance of R646 are correct but the voltage at H650 is
still incorrect, then there's a foil damage and the phone is to be discarded.
Fig. 9.5
Measure the resistance of C654 (>1 Mohms, class A, fig. 9.4).
• If it's incorrect, replace C654.
Check the soldering at D600 pin 94 (fig 9.2).
• If it's correct, measure the resistance from D600 pin 94 to H650 pad 3 (~0
ohms).
* If it's more there's a foil damage and the phone is to be discarded.
* If it's correct, replace D600 (class B, fig 9.2).
If the fault isn't fixed, send the phone to the next level.
9.5 The top indicator doesn't blink red.
Open the phone and check for liquid damages. Make sure the double LED, H650
(class A, fig. 9.4), is correctly soldered. If the solderings are correct, give the board
power and start it up.
Measure the voltage at H650 pad 2 (~3.8V, fig. 9.4).
• If the voltage is correct, replace H650 (class A).
• If the voltage is missing, measure the resistance of R646 (470 ohms, class A, fig.
9.4).
* If it's correct, measure the resistance of C621 (>10 kohms, fig. 9.4).
* If it's less, replace these components in the mentioned order; C621,
C614 and then C432 (all of them class A and in fig. 9.4 or 9.5). Note!
Check the resistance if C621 after every component replaced.
4/00021-2/FEA 209 544/3.D
SH888, S868, Standare Electrical Repair
41
(66)
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