Resetting A Short-Circuited X7-00 - Nokia X7-00 Service Manual

12. RESETTING A SHORT-CIRCUITED X7-00

Nokia X7-00 is susceptible to shorting of the VBAT line during display assembly due to exposed
VBAT at the Dipro IR LED. This results in the battery protection circuit opening. The following
instructions will close the battery protection circuit.
1. In order to get access to VBAT test pad, remove the top end cap as described in disassembly
instructions.
2. Set the power supply to 3.8VDC with current limited to 500mA. Put the negative side of
power supply to micro USB connector casing and positive side of power supply to VBAT test
pad (J2070). The power supply should show the current draw when battery protection
circuit closes. Phone should then power up provided VBAT level is high enough for SW to
start up. If phone does not power on, at this point a charger can be connected into the
phone and it should start charging and when VBAT reaches the proper level it should power
on.
47
Negative side of power supply connected to micro USB casing
(black probe) and positive side of power supply is connected to
VBAT test pad (red probe).
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Nokia X7-00 / X7-00.1
RM-707 / RM-659
Service Manual Level 1&2
Version 1.0