Baseband Troubleshooting; Introduction; General Guidelines For Nhl-2Na System Troubleshooting; Tools Needed For Troubleshooting - Nokia NHL-2NA Series Troubleshooting Instructions

CCS Technical Documentation

Baseband Troubleshooting

Introduction

This document is intended to be a guide for localising and repairing electrical faults in
the NHL-2NA device. First there is a brief guide for fault localising. Then fault repairing is
divided into troubleshooting paths.
Before any service operation you must be familiar with the NHL-2NA product and mod-
ule level architecture. You also have to be familiar with the NHL-2NA specified service
tools such as the Phoenix service software, flashing tools and software.

General guidelines for NHL-2NA system troubleshooting

Tools needed for troubleshooting

• Service tools (as listed at service tools chapter in service manual)
• Laboratory power supply with current indicator
• Oscilloscope
• Digital multimeter

General guidelines

General notes about the NHL-2NA product:
• Large colour display
• Keyboard on grip part, rocker, two softkeys and application key under display +
side keys (power key and IHF enabling key)
• Flex cable carries signals between LG4 and LS4 boards. Battery and charger plug
is in grip part, so if the flex is damaged phone cannot be powered on.
• UI-module (display, backlights etc.) is also connected to LG4 module with flex
cable.
• If the component reference is under 100, component is located at the LS4 board.
And if the component reference is over 100, component is located at the LG4
board.
When you get a faulty NHL-2NA device and you start to troubleshoot it, first check the
following items:
• If the device cannot be turned on by any means, see "dead device" troubleshoot-
ing
• Current consumption (missing consumption) gives an idea wether the device is
able to start up.
• Dropping supply voltage or very large current consumption indicates a short cir-
cuit
• Check wether the connection with Phoenix works and what can be discovered
with Phoenix (ADC-readings, baseband selftest, bb-calibrations etc.)
• Check baseband selftests with Phoenix if "CONTACT THE RETAILER." is shown on
the display.
• Check visually display and rocker faults
• Force phone to LOCAL mode and make keyboard test by phoenix
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NHL-2NA
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