Ericsson T18s Trouble-Shooting Instruction page 14

If the phone consumes more than 200mA, remove the display and check again.
• The fault was due to the display if the current consumption went down.
• If the current consumption still is too high, proceed to section 3.4.3.
If the phone consumes between 1 and 200 mA, starts (asks for SIM, searches for a
net...) and works as long as the On/Off key is pressed, but shuts off at once when the
key is released, proceed to section 3.4.4.
If the phone doesn't start, try programming it in the flash programmer.
• If the phone doesn't start in the flash programmer, proceed to section 3.4.5.
• If you're able to program the phone but it doesn't start afterwards or if the phone
is troublesome in the flash programmer, proceed to section 3.4.6.
• If the phone starts after programming it in the flash programmer there's probably
nothing wrong with the phone but to eliminate intermittent faults, check the cir-
cuit board for liquid damages and make sure there are no faulty solderings at
D600 (fig. 3.2).
3.4 Measuring a powered board.
3.4.1 Consumes current immediately (without the On/
Off key being pressed or DCIO kept high).
Open the phone and check for liquid damages.
Make sure the pads for the battery connector and system connector aren't dirty, oxi-
dised or liquid damaged.
Remove the dome foil and clean the keypads using a brush and alcohol.
Place the circuit board in the fixture without starting it up.
Check the voltages VDIG, VCORE, VRAD, VVCO and VRPAD (fig. 3.3).
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T18s, T18sc Standard Electrical Repairs
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