Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
8(78)
If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at
L340 at the side close to N300) with an oscilloscope, the value of the measurements should be
500 mV p-p.
If not, change B320.
If the fault still remains, it is probably due to N700.
Also check D602 (pin 5 and 6) they should be, 2.75
±
0.10 V
DC
.
If not, check the soldering and resold if necessary.
If the fault still remains, it is probably due to N700.
Check VBOOST 4.1
±
0.10 V
DC
and VRAD, 3.8
±
0.20 V
DC
.
If the measured values are incorrect use the circuit diagram.
2.4.2
Can be programmed, but does not start afterwards or is troublesome
in the flash programmer
Open the phone and check for liquid damage.
No further action should be taken for a liquid damaged unit, send it on according to the
local company directives.
Make sure the pads of the system connector not are mechanically or liquid damaged.
Attach the board to the fixture. Power up the board.
Measure the voltages VDIG and VCORE.DSP.
If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at
L340 at the side close to N300) with an oscilloscope, the value of the measurements should be
500mVptp.
If not, change B320, if the f still remains, it is probably due to N700.
Also check D602 (pin 5 and 6) they should be, 2.75
±
0.10 V
DC
.
If not, check the soldering and resold if necessary.
If the fault still remains, it is probably due to N700.
Check VBOOST ,4.1
±
0.10 V
DC
and VRAD,3.8
±
0.20 V
DC
.
If the measured values are incorrect use the circuit diagram.
2.4.3
Consumes more than 30 mA
Open the phone and check for liquid damage.
No further action should be taken for a liquid damaged unit, send it on according to the
local company directives.
Make sure the pads of the system connector not are mechanically or liquid damaged.
Attach the board to the fixture. Power up the board.