Ericsson T18s Trouble-Shooting Instruction page 13

Make sure the dome foil isn't damaged, especially at the On/Off key.
Make sure there are no faulty solderings at D600 (fig. 3.2, class B).
• If the fault is fixed, send the phone through the normal flow.
If the fault remains, continue at 3.3.
3.3 Current consumption with the On/Off key
pressed.
Insert a dummy battery into the phone.
• If the phone consumes current immediately, proceed to section 3.4.1.
Start the phone by pressing the On/Off key and check the current consumption.
If the phone doesn't consume any current when the On/Off key is being pressed it's
most likely the dome foil that's faulty.
• Open the phone and remove the dome foil.
• Make sure there is no liquid damages at the circuit board, especially around the
On/Off key. Any dirt at the keypads is cleaned away using a brush and alcohol.
• Mount a new dome foil (note that the circuit board must be dry when mounting a
new dome foil).
• Give the board power and start it up (in the fixture or in the back cover with the
system connector mounted to make the board lie steady).
• If the phone doesn't consume any current when the On/Off key is being pressed,
proceed to section 3.4.2.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
Fig. 3.2
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