User Guide

PAMS Technical Documentation 6 - Troubleshooting
NPE-4
Original ãNokia Corporation. Page 6-7
Flash programming doesn’t work
The flash programming can be done via the pads on the PWB or via system connector
X100.
In production, the first programming is done via the pads on the PWB.
The main differences between these are:
a) Flash programming voltage is produced different way.
b) Signal routings are different.
In case of Flash failure in FLALI station, problem is most likely related to SMD problems.
Possible failures could be Short circuiting of balls under µBGAs (UEM, UPP, FLASH). Miss-
ing or misaligned components.
In flash programming error cases the flash prommer can give some information about a
fault.
The fault information messages could be:
- Phone doesn't set FBUS_TX line low
The preliminary fault-finding diagrams for flash programming are shown in the next
page.
Because of the use of uBGA components it is not possible to verify if there is a short cir-
cuit in control- and address lines of MCU (UPP) and memory (flash).