Electronics > Repair
NOCO GB70 repair help
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jerryk:

--- Quote from: AN86 on October 15, 2024, 04:25:06 pm ---I can hold my exploring. But i didnt tell one maybe crucial info, when i did explore with probing the Q15, i turn the booster on and than i probe again, when it click i have voltage on clamps around 16.3v and the leds flash from 25 to 100%.
Maybe this info is good maybe its useless but just in case.

--- End quote ---

That kind of voltage is very concerning.  That would mean you have overcharged this battery and each cell is at 5.4V.  Please confirm the individual cell voltages in the three cells.

Jerry
AN86:
Guess bad battery was in that other device.
All 3 cells are at 4.15V. guess that 16.3 was some kind of a mistake in measuring device
jerryk:
So you have been able to charge the battery. 

Start from the beginning.

1. Press On/Off button Unit should turn on and all four battery indicator lights should be lit all the way up to the green led. You should also hear a click from 12V output transfer relay that's on the board.

2. Press and hold override switch for 3 seconds. You should hear a significant click and the battery indicator lights should repeatedly flash from 25% to 100%.  Then check voltage at clamps and it should be around 12.3V or so.

3. Press override switch. Flashing Leds stop and unit should return to the original on state described in step 1.

4. Press On/Off button Unit should turn off.

5. With the unit off Press the light button Unit should turn on with all battery leds lit and the light should turn on.

Do these things and nothing else and tell me the results.

Jerry
AN86:
Yes battery can be charged but only on USB port not,barrel port but thats not important as long as i can charge it anyhow.

so. lets go
1. Works
2. works
3. not work. when not in override mode on clamps i have 0.7V when override mode i have 1.6V, not good.
4. it turns off as it should.
5.Led works, and every variation of LEDS, dimed and strobing and stuff

I did check resistance of R305 and it was 4,69k ohms, i guess that is ok.
jerryk:
You answers to item 2 and 3 seem a bit contradictory.

Starting with item 2.  Can you confirm this is what happens.  While unit is on and with nothing connected to the clamp you press the override for 3 seconds - this will cause the two output relays to engage with an audible click.  At this point measure the voltage at the clamps and it should be 12.3 or so.

Your response to item 3 confuses me because you mention that in override mode the voltage is 1.6V but in item 2 you say it "works" which would mean the voltages at the clamps are 12.3 like I stated in item 2 test.   It would be helpful to know if the override is working correctly.

When the override is engaged all battery power transferred directly to the clamps via the two relays.  When not in override there is close to no voltage at the clamps. It's that simple.

If you could clarify this confusion that would be helpful. 

As for further testing measure the resistance between R305 on the side closest to the number 5 and the main battery ground above R106.

Take this resistance measurement with all JST plugs disconnected and then with just the relay plug connected. 

Remember the battery balance plug and the relay plug are the same. Don't mix those two up ;)


Jerry
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