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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Nokia > Nokia Hardware & Hardware Repair

Nokia Hardware & Hardware Repair all what you need for Hardware Repairing for Nokia Phones. Before writing any thread here try to check the Frequently Asked Questions Section.

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Old 07-02-2004, 13:03   #1 (permalink)
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2100 keypad LEDs still lighting


the phone was droped on the ground !
I rehot the PCB and clean It I arrived to revive It .
The phone workes but the keypad LEDs sill lighting .
What can be the problem please ?

Last edited by GSM SNIPER; 07-02-2004 at 19:16.
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Old 07-02-2004, 13:33   #2 (permalink)
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put a jumper from display led to keypad led
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Old 07-02-2004, 19:21   #3 (permalink)
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Quote:
Originally Posted by founderrfd
put a jumper from display led to keypad led

Did you explaine more that !
I said that the Keypad LEDS still lighting for all the time .
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Old 07-02-2004, 19:55   #4 (permalink)
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The ringer n LED controller IC may be bad. Try changin it.
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Old 07-02-2004, 22:03   #5 (permalink)
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try to change the UI_IC's, but before you change it, it will good if you lookin the resistor in the round of the UI_IC's, because it will be more safety. thx

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Old 07-02-2004, 22:48   #6 (permalink)
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i have same problem amstill unable to solve them i changed the ringer/light vibrator ic no success
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Old 07-03-2004, 22:19   #7 (permalink)
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I will test the keypad IC and replay .thans !
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Old 07-06-2004, 11:15   #8 (permalink)
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try to change ui module 100% tested
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Old 07-06-2004, 12:30   #9 (permalink)
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Quote:
Originally Posted by keany
try to change ui module 100% tested

Whati's this UI module please ! where on the board ?
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Old 07-06-2004, 20:29   #10 (permalink)
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Here's where u can get service manuals:http://web218.bces-3040.de/nokia/flash_unlock.php . Download the manual and learn which Ic controls the LEDs, keypad, ringer and buzzer. Change it. This ic is also called UI(user interface) IC. Please don't waste time any more time asking where this IC is. If after changing still u have probs u can ask for more hints. Post the results here.
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Old 07-07-2004, 14:50   #11 (permalink)
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Quote:
Originally Posted by Trion
Here's where u can get service manuals:http://web218.bces-3040.de/nokia/flash_unlock.php . Download the manual and learn which Ic controls the LEDs, keypad, ringer and buzzer. Change it. This ic is also called UI(user interface) IC. Please don't waste time any more time asking where this IC is. If after changing still u have probs u can ask for more hints. Post the results here.


I have changed the Ui from an other board and It's all ok thank you very much !!
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Old 07-07-2004, 21:26   #12 (permalink)
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KBD leds are controlled by the same IC as keboard leds,I don't remeber it's name and number.
But it have two inputs and two oitputs. Inputs are enable lcd light and enable keyboard light.
It also have two inputs (LCD and KBD) current adjast. If one of these (current setting) resistor is damaged then you will recieve no light.
There are also protective resistors... They can also be faulty.
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Old 07-07-2004, 23:39   #13 (permalink)
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Angry

Quote:
Originally Posted by azampk
don't chek chang keypad ic man
************Azam******************

checking the IC's is the best tricks to repair the phone, so what do you do if the IC's changed but the problem can't solve??????????????????????????????
It means probably the resistor arround the UI Ic's is bad or lost. So checking is the best way man...!!!
In the Service manual book there isn't shown what do you do "KEY PAD IC"!!!
Please be a professional man...!!!!!!!
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Old 07-08-2004, 19:51   #14 (permalink)
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Its true that resistors can get damaged, but in most cases changing the IC solves the prob.
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