Failed Self Test/Calibrate; Phone Not Powering Up; Shut Down After 32 Seconds; No Audio - Nokia 6235 Baseband Description And Troubleshooting

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• Make sure phone was programmed/flashed

Failed Self Test/Calibrate

• Make sure phone is in local mode
• Make sure power supply provides enough current (usually approximately 500mA
and 2A for tuning)
• Use the troubleshooting guide's float chart to verify the failed circuit
• Check the signals and voltage levels per troubleshooting guide.

Phone Not Powering Up

Refers to when no power causes phone to not able to flash, not to get into local mode
and similar problems.
• Check baseband regulators – VR3, VIO, VFLASH1, VCORE dc/dc, PURX
• Check VCTCXO 19.2MHz signal at UPP input
• Check power up sequence
• Check Flash IC, flash bus signals, and voltage level

Shut Down After 32 Seconds

• Check for the absence of 32KHz SleepCLK
• Check for incorrect SleepX and PURX signal levels
• Check if ESN number was corrupted

No Audio

• Check for bad contacts or damaged earpiece
• Check for bad connections at mic
• Check for broken or bad solder joint of passive components
• Verify the audio signal paths using BaseBand "audio test" component with
Phoenix as described in the troubleshooting guide

Key Pads Malfunction

• Check for protective film left on back of the key dome if a new one was installed
• Check for corrosion on both the key pads and key dome
• Check if flash software was corrupted
• Check for bad joint from UPP to Interface
• Check for pins shorted on or bad on Z300
Issue 1 04/2005
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
Baseband Description and Troubleshooting
Company Confidential Page 47