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Offline AK48Topic starter
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« on: February 22, 2019, 05:50:25 am »
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GPX 4500 bettery still faulty 

 
hello , i've change the all eight cell with new one but
when i connect battery pack to the unit , i've got the
message " poor battery shuting down unit " and the unit run
OFF , i think the issue is when it charged , the pack
don't reach 6,8 volts even after 8 hours charging ,
supply transfo is good , it deliver almost 30 volts , it
seems a chip is short on the board , someone has an idea ?

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Offline Eugene52
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« Reply #1 on: February 22, 2019, 02:39:18 pm »
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Quote:Posted by AK48
GPX 4500 bettery still faulty 

 
hello , i've change the all eight cell with new one but
when i connect battery pack to the unit , i've got the
message " poor battery shuting down unit " and the unit run
OFF , i think the issue is when it charged , the pack
don't reach 6,8 volts even after 8 hours charging ,
supply transfo is good , it deliver almost 30 volts , it
seems a chip is short on the board , someone has an idea ?


Thank you for posting . You definitely have a problem with the charging circuit.
Looking at the picture , it sure looks like part of the board overheated pretty bad . I see a 8 pin integrated circuit and 2 [3 pin] voltage regulators that do not look good in the photo. You need to check DC voltages around these components. All the parts on that board can be bought from Jameco or Mouser Electronics, very inexpensive.

Thank You so much for posting. This is what our forum needs to have , is friends like you on here posting questions about your Metal Detectors and Charging Circuits.

Also it is possible to find an equivalent circuit that will charge the battery and fit in the Minelab Housing.

Keep us Posted.

Best Regards...............Eugene

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« Reply #2 on: February 24, 2019, 03:06:13 pm »
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Quote:Posted by AK48
GPX 4500 bettery still faulty 

 
hello , i've change the all eight cell with new one but
when i connect battery pack to the unit , i've got the
message " poor battery shuting down unit " and the unit run
OFF , i think the issue is when it charged , the pack
don't reach 6,8 volts even after 8 hours charging ,
supply transfo is good , it deliver almost 30 volts , it
seems a chip is short on the board , someone has an idea ?


The ic in the photo just looks like its been resoldered (badly). Double check there are no shorts etc and remove all that excess flux. Its a small micro that monitors the thermistor, as well as voltage and charge current. Unfortunately not readily available if faulty but, having repaired quite a few of these batteries, I've never had one of those ic's go faulty.
Firstly you need to check the voltage across each cell before you put on charge. They should all be similar.
Next check the voltages while on charge. It should be greater than the original charge voltage and each cell should be similar. If not the same then a cell may be faulty.
Also are the aH ratings of the new cells the same as the old ones? If different this may cause a different charge rate which the micro ic may detect as a fault. If this is the case there are ways to trick the micro into thinking its ok. The ic monitors the current by comparing voltage drop across a resistor. These voltages are fed to the ic via a voltage divider. By changing the resistors in that divider you can get the ic to work correctly with the new cells. Unfortunately the values will have to be worked out on the fly. There is no easy way around it.

Sorry I cant be of more help but without having it on the bench, its hard to see whats going on.


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Offline AK48Topic starter
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« Reply #3 on: February 25, 2019, 02:11:33 am »
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hello , good morning , thanks for the answer , the smid IC near the thermistor it's an ATMEL 0939
tiny25 , the second smid IC at the right on the pic it's labeled LM243 6M5 on my board and on another 
same board , it's labelled : 78L05A 94M AGKZ (DIP)i'm gonna check afternoon , thank you , very nice

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« Reply #4 on: February 25, 2019, 02:40:30 am »
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Quote:Posted by AK48
hello , good morning , thanks for the answer , the smid IC near the thermistor it's an ATMEL 0939
tiny25 , the second smid IC at the right on the pic it's labeled LM243 6M5 on my board and on another 
same board , it's labelled : 78L05A 94M AGKZ (DIP)i'm gonna check afternoon , thank you , very nice



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Offline AK48Topic starter
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« Reply #5 on: February 25, 2019, 12:27:19 pm »
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hello , effectively , it's a 5 volt regulator , see PDF

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Offline AK48Topic starter
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« Reply #6 on: February 27, 2019, 12:34:24 pm »
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hello , finally , i found a smid chip with a broken leg , i can't read the mark on the chip , can someone read it  , thank you .

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« Reply #7 on: February 27, 2019, 02:48:15 pm »
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Quote:Posted by AK48
hello , finally , i found a smid chip with a broken leg , i can't read the mark on the chip , can someone read it  , thank you .


That smd is an analog switch for the audio circuitry. It has nothing to do with the charge circuit. All the circuitry in that photo is just for the audio. It can be completely destroyed and the charge circuit will still work. I have repaired over 50 of these audio circuits as its the most common fault the battery units have. Not once has it affected the charge circuit.

Just for reference the parts number is : TS5A3159DBVT.

I also sell the complete audio repair kit here:

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« Reply #8 on: February 27, 2019, 04:48:45 pm »
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hi , thank you man for the reply , i keep checking until i found the issue , thank you again

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« Reply #9 on: March 04, 2019, 02:26:27 pm »
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hello ; in a previous reply you say " Also are the aH ratings of the new cells the same as the old ones?
aH ratings of my news cells is : 1300 maH but i want you to told me what is it for the stock cell , please
thank you

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