SH888, S868, Standare Electrical Repair
4/00021-2/FEA 209 544/3.D
33
(66)
8 Keyboard.
8.1 Kind of keyboard fault.
Insert a SIM card and a fully charged battery into the phone. Start it up by pressing
the On/Off key.
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If it doesn’t start at all, proceed to chapter 3 (“Doesn´t start”-fault).
Press all the keys (including the volume keys) to verify which ones are faulty. Veri-
fication is most easily done like this:
1. Go to “menu/settings/key sound” and choose “click”.
2. Press the keys 1-9, *, 0, #. You should hear a clicking sound at every key pressed
and the corresponding symbol should appear in the display.
3. Press “Yes”, “No”, “clr”, “<“ and “>”. When pressing “Yes” the phone should
attempt to connect a call and pressing “No” should make it disconnect it. Press-
ing the “clr” key should erase symbols in the display and by pressing “<“ and
“>” you should skim through the menu.
4. Press the volume buttons. A clicking sound should be heard at every press.
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If one or both of the volume keys are non-functional, proceed to section 8.2.
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If one or more of the keyboard keys are non-functional, proceed to section 8.3.
8.2 The volume keys are non-functional.
Open the phone and check for liquid damages, especially around X820 (fig. 8.1).
Replace the flex film for the volume keys, assemble the phone and try again.
Fig. 8.1
Measure the resistances from the pads at X820 to ground (>1 Mohms at all three).
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If any of them are less, proceed to section 8.2.1.
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If they’re correct, proceed to section 8.2.2.