Nokia 3210 Repair Manual

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Nokia 3210 Repair Manual Manual pdf 32 page image

CONFIDENTIAL 32 (48)NSE-8/9 RepairhintsCustomer Care Europe & Africa Version 5.0 ApprovedTechnical Services Training Group Date: 05.09.2001© 2001 Nokia Mobile Phones Checked by:CC Training GroupApproved by:Technical ServicesDisplay FaultsIf one or more lines are missing completely as in picture below, change LCD unitFaulty display sampleBlack lines on LCDCheck VBB 2.8VDC at C400 and R421If voltage ok, change LCDNo display functionIf backlight works, but no symbol on LCD appears, in the most cases there are broken solderings under CCONT N100No LCD backlightCheck VDC_OUT = 3.2VDC at V406, V409, V412, V413Use WinTesla/Testing/User Interface/1.Test Pattern “on”/”off”.Check LCD_LED line at N400, pin 9: 1.2VDC in “on” mode / 1.9VDC in “off” mode.Check cathode of V406, V409, V412, V413: 1.2VDC “on”/ 1.9VDC “off”.Check LCD_LIGHT line at N400, pin 7: 2.8VDC “on”.Check also soldering of R415 and/or for shorts to GND.KEYPAD FAILUREKeymat faultyCheck the bottom of keymat for broken pins or mechanical damage.Board / Dome Sheet soiledIf there are only one or two keys without function, check and clean the keyboard area and Dome Sheet if soiled.NOTE: Different versions of Dome Sheets are available - see HW changes on page# 9.If all faulty keys are in the same ROW or COL line, check connections between the corresponding keys and to GND.If any line is disconnected between the keys, swap the unit as PCB is faulty.