NHL-4/4U Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Start
Measure VIO, VCORE,
VFLASH1,VANA, VR3
voltages. Are they OK?
Check VBATT1-6, VIO,
VCORE, VANA, VR3
lines. Are they OK?
Measure FBUSRX-signal during
phone info read from testpoint
J412. Is it OK?
Change TB4
module or retest
Change UEM
Measure watchdog signal from
testpoint J414. Is it OK?
No
Measure 32.6kHz Sleep Clk
from testpoint J404. Is it
OK?
Yes
Check L260-L265,
C260-C265, BSI/BTEMP
-lines and VBATT-lines
No
Phone shutdown after 30s
Measure 1MHz Clk signal from
testpoint J413. Is it OK?
Read phone info. Is it OK?
No
Check BSI/BTEMP-lines. If
OK, UEM regulators are not
working. Change UEM.
Yes
Measure Sleep Clk
from B200. Is it OK?
No
Check B200, C209
and C210
Change UEM
No
Yes
Measure 26MHz RFClk
from R420. Is it OK?
Measure 26MHZ RFClk
from G501. Is it OK?
Check R420, C420.
If OK, change N500.
Check G501.
If not OK, change.
No No
Yes
Measure PURX-signal from
testpoint J402. Is it ~1.8V?
Yes
Yes
No
Yes
Yes
Change UPP
No
No
Change UEMNo
No
Measure FBUSTX-signal during
phone info read from testpoint
J411. Is it OK?
Yes
Change UPP
No
Change UEM
Yes
Yes
Yes
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