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-   -   51xx charging problem (https://forum.gsmhosting.com/vbb/f131/51xx-charging-problem-1349/)

kage 02-25-2002 16:35

51xx charging problem
 
5130 (5146) NSK-1 v5.51

Plug in the charger, the tiny charger symbol appears, nothing happens for about 10sec then the NOT CHARGING display comes up.<br />Phone works fine in every other way.<br />The charger is genuine Nokia and I've tried several including car plus different batteries.

The only source it will charge from is a regulated power supply set to 7.5 or 9 volts.

The only thing done to the phone is unlocked (Rolis) - didn't think to check charging before unlocking.

Anybody seen this/know a cure?

ModaFone 02-25-2002 23:18

Try cleaning the battery contacts m8? might help?

kage 02-27-2002 19:48

Thanks ModaFone, no joy, though.
The only time I've seen this before is a 5130 with a bad flash (the MCU controls the charging, also)
Not that this time, though, the phone works fine.

mcrozz 03-01-2002 07:29

Check this, sri no blocks onlt txt but it might help out.............
this is for the 5110, donīt know if they are the same. If you want themanual contact me.



PAMS
Technical Documentation
NSE–1
Disassembly & Troubleshooting Instructions
Page 18 Original 03/98
Charger failure
YES
Nothing happens when charger is connected
Voltage level at pin 60 of CCONT (N100)
is higher than 0.4 V when charger is connected
NO Check
X100, F100, L104
R104, R103
YES
Check N100
Display Information: Not charging
YES
Voltage level at pin 62 of CCONT (N100)
is about 0.8 V when power is connected
BSI resistor value should be 39 k
NO Check
X101, R120, R122
YES
Voltage level at pin 63 of CCONT (N100)
is about 0.5 V when power is connected
BTEMP resistor value should be 47 k
NO Check
X101, R120, R122
YES
32 Hz square wave frequency at pin 7 of CHAPS (N101)
NO
Check
N100
Check
N101
YES
Voltage levels at pins 5 and 12 of CHAPS (N101)
are same as VB
NO
Check
R131, N101
YES
Voltage levels at pins 5 and 12 of CHAPS (N101)
rises when charger is connected
NO

kage 03-01-2002 15:38

Many thanks, mate. The model is the same on the power side.
I'll check that thro and let you know.
I'm surprised nobody else has met the problem.

Mateusz 03-01-2002 18:53

I have a similar problem that you mentioned, with the 5110. However, the charging works fine if I connect the phone to the standard (non-travel) charger.

Fast charger gives the same output as you report. Car charger sometimes does the same, sometimes works fine (almost: the battery gets very hot!).

kage 03-02-2002 03:10

Thanks for that, ******z.
Do you know what your chargers give as the DC voltage output for the "travel" and for the "fast"?

Your problem is similar to mine in that mine seems to charge OK with a regulated power supply at about 7.5v but it is a problem with my Nokia charger. I think it is what is called a "fast" charger.
The label gives 4.5v to 10.5 volts as the output. For a 3.6v battery, 10.5v has got to be fast!

I shall set up to do some tests, but,
if anyone else has more information, please let us know.

kage

M@RTY 03-02-2002 04:02

If my 51XX had the reported fault , i would :-

measure C103 with meter
if short circuit or low resistance , replace C103 (1uF 35v).
95% shure this will repair


replace V100 (never seen one go faulty)
5% shure this will repair
the other 5% is that your chaps ic (N101) is faulty or energy management needs re-calibrated.



Hope this helps


C103 is the large polorised capacitor on the bottom left of pcb (mad ic side of pcb)

Dj King 03-02-2002 19:12

Try also other battery coz sometimes the parts inside the battery is deffective and need to be replaced. Thats why it also displays NOT CHARGING. :)

kage 03-06-2002 00:42

Thanks to eveyone who helped - now know the answer.

Borrowed an old transformer type charger (non-travel) and worked OK.
Tested a few volts and found mobile will only charge if charger start volts is between 7 and 9.5
Travel charger starts about 10.5v

Don't have the wherewithall to re-calibrate so a zener in the charger is what it going to get.

kage


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