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

Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 04-09-2006, 12:20   #1 (permalink)
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k750 microphone


hi
the problem is that in talking other side hears me 5 sec yes,5 sec no,and looping
cheked tx power-same,5sec sending ,5sec no
even if somebody sends me massage i can receive it after 1 hour,when usually it takes 1-3 mins max
did full flash-same
any help please
tnx
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Old 04-09-2006, 23:36   #2 (permalink)
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Hi!

I have a K750 phone and no michrophone. Absolute not working the michrophone. I know the mic control BGA is bad.

I search michrophone repair solution, to look like the K500 michrophone solution!

THX!

Bye: MikroBig
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Old 04-10-2006, 00:04   #3 (permalink)
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HI me man used the Search
http:///vbb/showpo...14&postcount=3
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Old 04-10-2006, 07:28   #4 (permalink)
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ok now mic on k750i is not a normal mic as in tasos1971 sheme, it is actually patr and parcell of the pcb and cannot be removed or replaced, so dont go down that road thinking you can replace,
@gena & @microbig on the bottom of phone next to charge block there is a very small hole in housing , make sure this is not obstructed with dirt
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Old 04-10-2006, 08:53   #5 (permalink)
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Quote:
Originally Posted by fonecellar
ok now mic on k750i is not a normal mic as in tasos1971 sheme, it is actually patr and parcell of the pcb and cannot be removed or replaced, so dont go down that road thinking you can replace,
@gena & @microbig on the bottom of phone next to charge block there is a very small hole in housing , make sure this is not obstructed with dirt
you can replace mic with a normal one,but you have to put it oposite(reseption side to the hol)
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Old 04-10-2006, 10:23   #6 (permalink)
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the mic is glued strongly to z pcb ,so removing it not a simple thing ,add to that schem isn't clear enough
so m8's if u want to help put clear advice 'n pic
br
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Old 04-10-2006, 11:19   #7 (permalink)
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mic is not glued,but soldered with leed free solder wire(400-450 oC).actualy you need infrared station to do that job,but if you have enouhg experience then you can take out mic using hot air,without burn it.

picture is clear enough,just you have to put mic to the hol
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Old 04-10-2006, 21:43   #8 (permalink)
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yea i have tried hot air without success, also the memcard holder is in the way
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Old 04-18-2006, 22:49   #9 (permalink)
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I doesn't a faliure removed the old mic unfortunately
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Old 05-18-2006, 13:46   #10 (permalink)
opo
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I manage to take off corectly the Mic in perfect condition and i compare the values with new one. I got the same values but no sound coming from the mic. So i think that something else is wrong.. Does someone have PCB schematics??
BR
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Old 05-23-2006, 17:08   #11 (permalink)
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Quote:
Originally Posted by Platijet
you can replace mic with a normal one,but you have to put it oposite(reseption side to the hol)

where can i get that 1.2k ic?
thanks
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Old 06-02-2006, 10:30   #12 (permalink)
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Thanx man,
solution works... i put inside k750 mic from T610 & resistor from old 3210 pcb (r603...1.0K) and it works......

Platy
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Old 06-02-2006, 10:49   #13 (permalink)
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Hi All,

Pls, Anyone Can Post Here Good Photo Both Side.

I Want To Find Any Solution, How To Desolser Mic

Without Infrared Station And Without Damadge Pwb.

Thanks.

Wbr
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Old 06-05-2006, 13:10   #14 (permalink)
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i like to bring this forward.
i've a k700i contacted with liquid after servicing is still not working,i later flashed the fone with cruiser still i cannot here and the same time not charging i change the earpiece it work 4 a while and stop but the earpiece is ok.
now you cannot ear anything except you use handsfree and is not charging all this are not software.
could i have a solution to this.
thnks.
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Old 06-05-2006, 16:44   #15 (permalink)
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I found one problem. Check if one of the mic pad is shorted to the ground then the problem is not the mic but is the EMI Filter near the power supply it is responsable of the bottom mic. The other pad goes under the power supply. This motherboard (SE) are very difficult to work, as i needed to use rework station and solder iron to take off the cristal IC....}
This time i was lucky as i have one dead k750 phone and i took the cristal from it. Does anyone have idea how to make wires on this IC as i feel like this is gonna be very frequent problem....
BR
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