Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions page 53

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Display troubleshooting 3
Display
faults 3
Does the display start ?
Yes
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Try change
Display module
Is it working now ?
No
Measure
VDD (2.78V) and
VDDI (1.8V) from
X300
Is it OK?
Yes
Measure
VOUT voltage.
Is it ~8.1V?
Yes
Measure
XRES, XCS.
Is it ~1.8 V?
Yes
END
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Yes
No
Check X300
No
No
No
1+0
Retest
Check C303
and solders
If OK,
lines to X300
are broken
Change LA4
module
Check C330
X300 and
lines
Check X300
and lines.
If OK, change
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