E720 keys not working after fell into water - GSM-Forum

PitchBend · 08-24-2005, 15:41

My E720 fell into a river, I let it dry for several days, after that it powers on and seems to work normally but neither internal nor external (mp3, volume, camera) keys work, ¿any ideas?

Hylko · 08-27-2005, 01:02

Open your phone remove the plastic on the front of the PCB
clean it with 96% alcohol.

Let it dry and put all part back together

Br Hylko

flashfone · 08-27-2005, 01:05

vodka or aftershave will do with cottonbud and toothbrush

PitchBend · 08-29-2005, 13:20

The motherboard is clean, but still keys don't work, someone has told me in this same forum that he has solved the problem in his E720 by removing the "protective varistors in the keypad side" anyone knows what does this mean? thanks in advance.

_-oRc-_ · 08-31-2005, 17:35

yes you must search in service manual and remove varistors.....

PitchBend · 09-01-2005, 15:05

I've located the varistors in the service manual, and I've removed all that are located on the keypad side of the motherboard, but nothing changed, do I need to put some tiny wire or something where the varistor was so electricity can flow? Or I just have to remove them and leave it alone.

Here are the varistors I've removed:

http://personales.ya.com/ferrerb/E720MBF.jpg

Thanks in advance

_-oRc-_ · 09-01-2005, 15:18

just remove varistors .... i don't work check maybe you left some in back side of PCB

PitchBend · 09-01-2005, 19:24

It worked!

Thanks a lot -oRc- I've finally removed all varistors in PCB (around 20) and now my E720 works smoothly!

I post here some pics in case someone needs to know wich varistors to remove and where are they located.

_-oRc-_ · 09-02-2005, 09:12

no problem

BR
_-oRc-_

jennygdgsm · 09-05-2005, 06:30

hi:
any body need e720 original housing and lcd.please contact me,thanks !

b.r
jenny

Angello · 09-10-2005, 10:46

Quote:

Originally Posted by PitchBend

It worked!

Thanks a lot -oRc- I've finally removed all varistors in PCB (around 20) and now my E720 works smoothly!

I post here some pics in case someone needs to know wich varistors to remove and where are they located.

i don't understand why removed all varistors for key work?

For me i removed only that who was broken and now all key work.

_-oRc-_ · 09-10-2005, 12:13

but in near future... you must remove next, next .... just do this once and good...

PitchBend · 09-10-2005, 19:42

I removed all because I know nothing of circuit boards, Samsung Technical Service asked me 290€ + Taxes to repair the damn phone so I ended up here out of necesity, I don't even know what a varistor is or how to test it, I had nothing to lose, so I removed all those moth*rf*ckers, BTW anyone knows what are the consecuences of removing varistors?

Angello · 09-12-2005, 08:54

Ok thanks for reply.

bubbles69 · 12-11-2005, 19:29

excellent just fixed my e720 this way,,, great post..
anyway what are the purpose of the varistors?

08-24-2005, 15:41	#1 (permalink)
PitchBend Junior Member Join Date: Mar 2003 Posts: 35 Member: 24149 Status: Offline Thanks Meter: 9	E720 keys not working after fell into water My E720 fell into a river, I let it dry for several days, after that it powers on and seems to work normally but neither internal nor external (mp3, volume, camera) keys work, ¿any ideas?

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08-27-2005, 01:02	#2 (permalink)
Hylko Freak Poster Join Date: Oct 2000 Location: The Netherlands Posts: 201 Member: 2438 Status: Offline Thanks Meter: 1	Open your phone remove the plastic on the front of the PCB clean it with 96% alcohol. Let it dry and put all part back together Br Hylko

08-27-2005, 01:05	#3 (permalink)
flashfone No Life Poster Join Date: Mar 2005 Location: United kingdom Age: 44 Posts: 728 Member: 129546 Status: Offline Thanks Meter: 2	vodka or aftershave will do with cottonbud and toothbrush

08-29-2005, 13:20	#4 (permalink)
PitchBend Junior Member Join Date: Mar 2003 Posts: 35 Member: 24149 Status: Offline Thanks Meter: 9	The motherboard is clean, but still keys don't work, someone has told me in this same forum that he has solved the problem in his E720 by removing the "protective varistors in the keypad side" anyone knows what does this mean? thanks in advance.

08-31-2005, 17:35	#5 (permalink)
_-oRc-_ Freak Poster Join Date: Aug 2002 Location: Poland / Kolbuszowa Age: 43 Posts: 409 Member: 14277 Status: Offline Thanks Meter: 2	yes you must search in service manual and remove varistors.....

09-01-2005, 15:05	#6 (permalink)
PitchBend Junior Member Join Date: Mar 2003 Posts: 35 Member: 24149 Status: Offline Thanks Meter: 9	I've located the varistors in the service manual, and I've removed all that are located on the keypad side of the motherboard, but nothing changed, do I need to put some tiny wire or something where the varistor was so electricity can flow? Or I just have to remove them and leave it alone. Here are the varistors I've removed: http://personales.ya.com/ferrerb/E720MBF.jpg Thanks in advance

09-01-2005, 15:18	#7 (permalink)
_-oRc-_ Freak Poster Join Date: Aug 2002 Location: Poland / Kolbuszowa Age: 43 Posts: 409 Member: 14277 Status: Offline Thanks Meter: 2	just remove varistors .... i don't work check maybe you left some in back side of PCB

09-02-2005, 09:12	#9 (permalink)
_-oRc-_ Freak Poster Join Date: Aug 2002 Location: Poland / Kolbuszowa Age: 43 Posts: 409 Member: 14277 Status: Offline Thanks Meter: 2	no problem BR _-oRc-_

09-05-2005, 06:30	#10 (permalink)
jennygdgsm Freak Poster Join Date: Nov 2004 Age: 43 Posts: 135 Member: 91014 Status: Offline Thanks Meter: 0	hi: any body need e720 original housing and lcd.please contact me,thanks ! b.r jenny

09-10-2005, 12:13	#12 (permalink)
_-oRc-_ Freak Poster Join Date: Aug 2002 Location: Poland / Kolbuszowa Age: 43 Posts: 409 Member: 14277 Status: Offline Thanks Meter: 2	but in near future... you must remove next, next .... just do this once and good...

09-10-2005, 19:42	#13 (permalink)
PitchBend Junior Member Join Date: Mar 2003 Posts: 35 Member: 24149 Status: Offline Thanks Meter: 9	I removed all because I know nothing of circuit boards, Samsung Technical Service asked me 290€ + Taxes to repair the damn phone so I ended up here out of necesity, I don't even know what a varistor is or how to test it, I had nothing to lose, so I removed all those mothrfckers, BTW anyone knows what are the consecuences of removing varistors?

09-12-2005, 08:54	#14 (permalink)
Angello No Life Poster Join Date: Jan 2003 Location: France Posts: 590 Member: 19927 Status: Offline Sonork: joe-lindien Thanks Meter: 58	Ok thanks for reply.

12-11-2005, 19:29	#15 (permalink)
bubbles69 Freak Poster Join Date: Nov 2004 Location: Essex UK Age: 44 Posts: 158 Member: 94849 Status: Offline Thanks Meter: 3	excellent just fixed my e720 this way,,, great post.. anyway what are the purpose of the varistors?