Display Faults - Nokia 3210 Repair Manual

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Display Faults

If one or more lines are missing completely as in picture below, change LCD unit

Faulty display sample

Black lines on LCD

Check VBB 2.8VDC at C400 and R421

If voltage ok, change LCD

No display function

If backlight works, but no symbol on LCD appears, in the most cases there are broken solderings under CCONT N100

No LCD backlight

Check VDC_OUT = 3.2VDC at V406, V409, V412, V413

Use

WinTesla/Testing/User Interface/1.Test Pattern

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 FAILURE

Keymat faulty

Check the bottom of keymat for broken pins or mechanical damage.

Board / Dome Sheet soiled

If 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.

CONFIDENTIAL

NSE-8/9

Date: 05.09.2001

"on"/"off".

Checked by:

CC Training Group

32 (48)

Repairhints

Version 5.0 Approved

Approved by:

Technical Services