Nokia RH-99 Service Manual page 54

RH-99; RH-100; RH-105; RH-106
Baseband troubleshooting
Phone doesn't set FBUS_TX line low
Because of the use of uBGA components it is not possible to verify if there is a short circuit in control- and
address lines of MCU (UPP) and memory (flash).
Figure 9 Flash programming fault
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