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Also make sure the keyboard, dome-foil and the keyboard pads are correct and clean.
If needed replace them according to the mechanical repair guide
If there is signal program in the phone, you have to program it with test program.
2.3
The phone can not be programmed
Make sure:
1. That the battery screws and the battery insulator are okay and tighten.
2. That the system connector is not dirty, mechanical or liquid damaged.
No further action should be taken for a liquid damaged telephone.
Attach a dummy battery.
If the phone consumes current immediately, the fault usually depends on a short circuit of
VBATT
Start the phone with the On/Off button and check the current consumption.
If the phone consumes no current at all when the button is pressed, there might be a liquid
damage. Open the phone and check for liquid damage.
Make sure that the battery insulator is correctly fitting.
Also make sure the keyboard and the keyboard pads are correct and clean.
If the phone consumes more then 200 mA, go to section 2.4.3.
If the phone does not start, try to program it as a card.
If the phone does not start in the flash programmer, go to section 2.4.1.
If the phone can be programmed, but does not start afterwards or is troublesome in the flash
programmer, go to section 2.4.2.
If the phone starts after programming, the fault probably is okay, but to eliminate the possibility
of intermittent faults make sure the soldering at D600, D610 or D630 is correct.
2.4
Measuring at a powered circuit board
2.4.1 The phone does not start in the flash programmer
Make sure the pads of the system connector are not burned.
Attach the board to the fixture.
Keep the board powered up using DCIO high.
Measure the voltage VDIG and VDSP (+3.2 V
If any of the voltage are too low, measure the resistance to ground, VDIG >500ohms, VDSP
>25kohms.
If the resistance is correct, replace the corresponding circuit, VDIG - N702, VDSP - N701.
If the resistance is too low, use the schematics.
Remove one component (or lift the pin/pins feeding the circuit) at the time that is fed from the
short circuit voltage and measure the resistance after removing it. Do not forget to mount all the
components that have been removed.
4/00021-3/FEA 209 544/18 B
Trouble Shooting Guide, Advanced
).
DC
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