View Full Version : P800 - extreme battery drain & hot
jago25_98
09-15-2004, 01:38
My P800 is only holding charge for about an hour in flight mode.
The phone is hot to the touch too.
I've:
- checked for background apps
- formatted the thing
- tried 2 different batteries (different mha too)
Am I right in thinking there's a resistor in there doing too much work or something? Could there be a short?
- how much do these things cost to fix in general? < £40?
- the fix for a not-recharging problem involves a transistor near the power socket. Could this be involved here too?
When my screwdrivers arrive I'll take the case off and try to find where the heat is coming from; probably the battery.
Maybe I can get replacement part from somewhere - replacement mainboard?
jago25_98
09-17-2004, 02:05
Nobody ever experienced or heard of this problem in any phone or indeed any hardware at all, ever?
YourPhone
09-17-2004, 02:10
Never heard of the problem with SE phones, nokias yes all the time mainly 7250 and I remove camera and all ok, check for water damage and anything obvious inside that maybe shorting out :)
jago25_98
09-18-2004, 01:36
thanks for advice, screwdrivers are on the way :)
@ Jago25 98
Open handset check for liquid damage
I've had one like that the charging circuitry was faulty check to see If its the phone thats getting hot or the battery
Regards D.
I've EXACTLY the same problem (seems not to getting charge, no red light no sw indicator, but sloooowly charge in hours. when disconnected the charger, battery drains to zero in minutes, even with the phone turned off, and getting hot from connector area!)
No liquid penetration, no drops!
It happen after that the external power charger was ****!
hhheeelllppp!!! :( :( :(
jago25_98
04-08-2005, 01:43
Well I bought another P800 in the end!!
However, there's a post regarding a problem that I feel might be related:
http://forum.gsmhosting.com/vbb/showthread.php?t=154259
Pay attention to platijet. He's the man on that thread (hero).
Also, check that the screen isn't touching the side, possibly refit it. And obviously clear background programs with SMAN 's flush (I set it to internet button)
petermov
04-08-2005, 11:22
ok, here goes the solution:
Try to change a small regulator,it is like a transistor with three point to board and then change charge filter (it seems like a small silver square), both pieces near of the charge conector on board.
B.R.
petermov
04-08-2005, 11:24
You can do the bridge too betwen the two points as shown on the picture of two posts ago...
i had one doing the EXACT same thing, after a full factroy set (format internal disk) the battery last for days...strange but true..
kkusevski
04-08-2005, 16:19
petermov is right. The regulator is actualy a fuse wich protects the phone from high current. If the charging voltage is bad, then this regulator is short circuiting and protecting the phone. Its location is on the top left corner of the PCB near the power regulating IC. There are 2 with same size so check wich of them is short circuted.If the phone is not watter damaged then is unlikely that the small cristal on the bottom is the problem. Good luck.
First of all I would want to thank who answered me :)
Now I would want to say something that should exhibit with extreme clarity my problem.
If I introduce a charged battery in the telephone, leaving the P800 completely turned off, the current absorption is 300mA !!! :eek: :eek:
So I don’t think that adding some wire bridge in the PCB will solve this.
Maybe the problem is in some components, that drains continuously current from the battery, with or without the external charge, with the telephone switched on or off, making some warm in the external connector zone (+30°C, when Tambient=+22°C).
So, what is broken? One of the two diode (or transistor?) 6F42? The IC R1A KC H487F? Other? :confused:
Unfortunately I am a newbie and I don’t have nothing to be able to decide alone thing to do (don’t have the partlist, neither the schematic :( ). If someone of you has these information, would pray to send them by email (ftrasatti@tin.it)
I've uploaded two photos of my P800, so that you can annotate them with some suggestions. :D
Thank you all. ;)
Francesco
P800 photo 1-Connector zone (http://it.msnusers.com/_Secure/0YAAAAAggpUuk569vnvWO1zlviCVT5DVdVzwLvrJJctkO7BEL6 8XYFqIG!jsVnAzkP6eJ!3q*E45aMd2J8ePFBFSZV5CLNT1Tv3Q oD0w2L*fswdo4nopH3r8V8yJ1xuVgffuAMdn3J4WgcG8YVR*4d w/p800_connector.jpg?dc=4675517497116176405)
P800 photo 2-Full (http://it.msnusers.com/_Secure/0WwAAAPAdAIzCJSumTrCgQERyu6*DNvR!l89k9gL6iwBhdjMck sLTqVYOplkz!D24sBF8IBRP98KcO0NeamYJmGzQFQiUFl3IGjP 2VhMzAnNjdcECW*hGLRNU0CWJBTYdIEIxDZUQGRI/p800_full.jpg?dc=4675517497279253132)
Platijet
04-10-2005, 15:01
so,problem is not that phone can't charge but somewere you have shortcircuit.measure the "+" and "-" of battery connector to PCB to find the resistance(in normal case must be more than 20Kohm)so,connect only PCB(not screen etc) to the battery and try to find by tuching all parts of PCB from where heat is coming.
ok, here goes the solution:
Try to change a small regulator,it is like a transistor with three point to board and then change charge filter (it seems like a small silver square), both pieces near of the charge conector on board.
B.R.
propably petermov mean V502,is not regulator but double zener diode and this is heating in case of shortcircuit only when you connect the charger.
masud007
04-10-2005, 19:06
hi master of gsm mr savigsm wil u pls help me fr my ericssion t310 everthing is ok but when i on the phone after 3/4 min phone wil restart .pls help me n send the soluations on my mail pls at masud007_masud007@yahoo.com
petermov
04-11-2005, 11:22
it is a zenner diode
measure the "+" and "-" of battery connector to PCB to find the resistance(in normal case must be more than 20Kohm)so,connect only PCB(not screen etc) to the battery and try to find by tuching all parts of PCB from where heat is coming.
I've disconnected the display, and done the measurements you're suggesting.
Current absorption from battery: 0.3 A (so the display isn't under absorption.)
BATTERY (+) to (-) resistance=767 ohm
BATTERY (-) to (+) rev polarity resistance=130 ohm
CONNECTOR (+) to (-) resistance=13.7 ohm
CONNECTOR (-) to (+) rev polarity resistance=13.7 ohm
CONNECTOR (+) to BATTERY (+) resistance=770 ohm
CONNECTOR (-) to BATTERY (-) resistance=0.0 ohm
The resistances between + and - are very low!
The IC "R1A KC H487F" (small square, silver, near the ext connector) became immediately very hot when connecting the battery (but maybe the "shortcircuit" may be in another place?).
Please, give me a little more help to find the fault :)
Platijet
04-12-2005, 19:28
1st of all you can't measure resistance when the circuit has voltage,so you can't measure baterry resistance(special tools do this job for battery resistance Er).
in other case(more voltage) you will burn your multimeter.
so,remove this IC and check again the area if still heating.
1st of all you can't measure resistance when the circuit has voltage,so you can't measure baterry resistance
:eek:
:D ehm, I haven't explained myself very well!
The resistances that I have measured are NOT with the battery placed on the phone, of course! :p
My measures are the circuit resistances measured with a multimeter at 4 points: the battery connection pins (+) and (-), the external connector pins (+) and (-), and between them! With the motherboard disconnected from everything (battery, display...) ;)
Platijet
04-13-2005, 12:22
ok,so the next nove is to remve this ic
masud007
04-13-2005, 15:47
hi petermov u give me that solutations?but no reasult wil u pls snd me color sehcamatic on my mail at masud007_masud007@yahoo.com
ok,so the next nove is to remve this ic
Ops...
My job colleagues says to me that they may remove the IC (bga? microbga?) with hot-air solder.
But then they don't think to be able to resolder it. :( :(
And now, what I can do??? :confused:
Are you sure that I can't remove some other component, that is more easy to solder?
Thank you very much!
Platijet
04-14-2005, 21:23
the most posibilites has this ic.heat is coming from there is been short circuit.
now about to resolder this ic:everything is mater of experience(reballing etc).
My P800 is only holding charge for about an hour in flight mode.
The phone is hot to the touch too.
I've:
- checked for background apps
- formatted the thing
- tried 2 different batteries (different mha too)
Am I right in thinking there's a resistor in there doing too much work or something? Could there be a short?
- how much do these things cost to fix in general? < £40?
- the fix for a not-recharging problem involves a transistor near the power socket. Could this be involved here too?
When my screwdrivers arrive I'll take the case off and try to find where the heat is coming from; probably the battery.
Maybe I can get replacement part from somewhere - replacement mainboard?
I have solved this problem thru "washing" the board with alcohol. This worked for me
the most posibilites has this ic.heat is coming from there is been short circuit.
now about to resolder this ic:everything is mater of experience(reballing etc).
OK! :p
But before removing it I wan't to have on my desk at least 2 new pieces of this IC :D
May you tell me the part name and manufacturer?
Thanksss ;)
Platijet
04-16-2005, 13:09
you can find it only by another SE phone
you can find it only by another SE phone
:eek: :eek: :eek:
Do you know if it may be in a SE other than P800/9xx?
Or in some Ericsson phones?
Platijet
04-16-2005, 14:27
if you mean the esd matrix then the most SE phones has the same.
I can't believe it! I can't believe it!!! :eek: :eek:
I've substituted my broken motherboard with one of my friend (that have a P800 with a broken display) and now... THERE IS A LOCK UPON THE SIM CHANGE, and HE DON'T REMEMBER ANYTHING ABOUT THE SECURITY CODE! :rolleyes: :rolleyes:
Asking you: there are some "codes" or "procedures" to remove this lock, even with the correct SIM card (the one of my friend)?
Thanks! ;)