CSL EM941, Service Manual, Page: 27 / 40

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The test flowchart of download failed
Replace or
re-solder J302
connector
Check whether power management and
LD0 have output voltage normally and
whether there is broken of power supply.
Can not download
Check conditions outside
the mobile, such as
configuration of software,
cable, power, PC etc.
Whether
mobile is
power on?
NO
NO
NO
NO
YES
YES
YES
YES
YES
OK
Replace or re-configure.
Check whether J302
connector is false solder
or damaged.
Connect download cable.
Check whether current is
larger than normal.
Disconnect cable immediately
and touch chip gently to check
whether the chip is heat.
Test VCORE, VDD, VADD,
VTCXO, VRTC, VMEM and clock
signal of 26MHZ
、
32KHZ.
Replace U101
NO