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Keypad karbann power key direct on then not working

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Micromax q1+ invalid sim problem

Posted on Jul 14, 2013


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Posted on Jan 02, 2017

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Karbonn k202+ keypad jumber solustion


karbonn k202+ kypad not work

Sep 09, 2013 | Cell Phones

Tip

How to repair keypad problem in China Mobile


First we need to know china phone keypad connected with PCB how way
(A) Direct on PCB
(B) Flex System (flex cable direct soldering pcb to keypad panel)
© Flex and socket system include (flex one side soldering with key panel other side connect to pcb with socket)
(D) only Socket System (here have 2 socket, 1 with key panel others with pcb)
Keypad problem have various type
1. All key not work.
2. some key work and some other not work.
3. sometimes work and sometimes not work.
1. All key not work
china phone all key not work for this type of problem
(A) though its touch screen phone, first try to disconnect touch panel line from phone pcb or display flex (4 line)
(B) though not solve and keypad direct on pcb first you try to good clean full pcb with cleaner.
© though not solve now you try to format/flash your phone because some time key problem come from software problem.
(D) though still not solve now you check must be CPU. 95% china phone keypad directly going in cpu. and other 5% first going to resistor or capacitor near the cpu or keypad than going to cpu. so now first check them than you can try to re-hot, re-soldering or changing cpu.
(E) though its flex or socket system, first check GND connection continuslay pcb to key panel. next check full flex or socket all line going continuously pcb to key panel or not. also sometimes flex or socket shorted with other line or gnd so check also them.
(F) Also you can check all key anyone is short 2 line.
(G) sometimes keypad line broken from cpu pin on pcb to key panel, so check them.
2. Some key work and some other not work
Some key work and some other is not work for this type of problem
(A) maximum time this problem we face for flex or socket system keypad. so check flex cable and socket all line any line is broken or not and though need change them. and check all key connection on key panel.
(B) though its direact on pcb, some of key line broken internaly. and maximum china phone have alternative test point near every key or with other key on keypad. so check them with multimeter and though need connect to not work key with near testpoint or other working key.
© common problem is keypad metal ball (which is short 2 line on key when we press) sometimes its damage for phone water damage or over key voltage, so clean them or change.
(D) also try to check line continuously from cpu to not working key.

3. sometimes work and sometimes not work
this problem come from this defect
(A) flex or socket system keypad any line is bad soldering or do lose contact. check them and
re-soldering or keep there line join with extra ware.
(B) for cpu bad soldering or cpu pin is broken. so re-hot or re-ball cpu.

on Jan 06, 2010 | Cell Phones

9 Answers

Karbonn k9 white display


halo sir karbann k9 white display

Jun 02, 2012 | Nokia N73 Cellular Phone

1 Answer

Buttons won't work. Just returned from a 6 day golf trip where the SkyCaddie SG4 worked perfectly for the first 5 days. I recharged it in a wll outlet overnight, then on the next day the buttons...


Power On/Off and Key Lock/Unlock - Press the Power button located at the top right
of the Sky Caddie to power on/off or to lock/unlock the keypad. Upon pressing
the Power button you are prompted to choose either "Off" (Left Soft Key) to power
off the device or "Lock" (Right Soft Key) to lock the keypad. To unlock the keypad,
select 'Unlock" by pressing the Right Soft Key, then choose "Yes".

Jul 02, 2011 | SkyCaddie SG 4 Handheld GPS Receiver

2 Answers

Keypad in w350i not working...how 2 repair tat


Remove the external key pad and press the internal keypad on the phone board directly, may be the external key pad rubber is not contacting the one on the phone board.

Or you can loose the phone, and clean the internal part of the key pad. There might be dust on it, you could also use this medium to service your phone. If it does not work after all these, then I think you have to change the key pad completely.

I wish you the best.

Nov 23, 2009 | Computers & Internet

1 Answer

The keypad does not work. The display screen says "Press -----k". I'm assuming it's telling me to press clock to set time. But none of the keys work when I press any. Earlier only the Start/Pause key...


try powering down for 30 seconds. if that doesn't work the keypad is shorted or open. do not spray cleaner directly onto key pad when cleaning. it will short it out. rather spray cleaner onto a rag then wipe.

Jul 02, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

How to use face detection


Hi
Turn on camera as if you were taking a photo. Whilst holding phone vertically, in bottom right of screen you have a box image with lines. Below this on the keypad you have a 'soft key' (right hand '-' key) Press this and it takes you into camera settings. Turn phone horizontal and there is a menu across the top of the screen. Move cursor to the right using directional keypad until the little man with a box around his head is highlighted. Now pressing up and down on directional keypad, you should be able to highlight on / off with a white band? With desired option highted press 'ok' in middle of directional pad. That should now work.

Apr 29, 2009 | Samsung U900 Soul Cellular Phone

1 Answer

Combination on car keypad does not open doors


Does the key pad on the door light up? Are there any tears in the key pad numbers? Does the key pad lock the doors?.
There are no fuses directly for the pad.. The key pad is linked directly to the RAP. module. If the locks work from the FOB the fuses for the Module are good. Chances are the pad is no good especially if it don't light up. The RAP module is above the driver side foot well, directly above the accelerator pedal . Hope this helps.

Mar 09, 2009 | 1999 Ford Taurus

1 Answer

LG LMVM2055SB over the range microwave keys not working


Is it possible someone may have sprayed cleaner directly onto the keypad area?

This causes moisture to get into the keypad and sometimes onto the control board.

This could mean that they control panel frame with keypad (membrane switch) would need to be replaced.

Can you give more details on the cleaning?

Nov 18, 2007 | Microwave Ovens

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