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Old 10th November 2011, 03:50 PM   #11
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Location: Louisiana
Q5 appears to be defective.
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Old 27th November 2011, 09:57 AM   #12
manina is offline manina  Germany
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It took some time but I finally got both e Q5 and Q6 replacements.

I changes both of them and is still not charging.

Actually, there is something at the output (around 12,5V) however it's not what should be as the working one has a higher voltage (13,3) with the supply at 13,6V
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Old 27th November 2011, 10:53 AM   #13
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Post the DC voltage on the two transistors you replaced.
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Old 28th November 2011, 10:45 AM   #14
manina is offline manina  Germany
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Very similar to the one I posted earlier

Q5 (MPSA56)
1 13,14
2 12,52
3 0,76

Q6 (MPSA06)
1 0,05
2 0,73
3 0,06

while, on the working one, the voltages are

Q5 (MPSA56)
1 13,3
2 13,3
3 0,63

Q6 (MPSA06)
1 0,02
2 0,63
3 3,01
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Old 28th November 2011, 11:24 AM   #15
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What's the voltage measured directly across R13 in each one?

Are you sure that the voltage on pins 1 and 2 of Q5 in the working one are accurate?

Is the charge LED lit on both?
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Old 28th November 2011, 02:40 PM   #16
manina is offline manina  Germany
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Join Date: Mar 2008
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R13 (100 Ohm - pin 2 of Q5) has the same voltage at both ends that equals the output voltage - on both of them.

I'm using a good meter (Fluke 77) so it should be quite accurate

What is definitely different is the voltage at pin16 of IC2 - it's 3V in the working one and 0,06 in the non-working one

And the green light is lit on both - this is what make me crazy
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Old 28th November 2011, 05:16 PM   #17
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There seems to be multiple problems. Let's try to determine why it's not charging first.

Since the voltage on pin 16 is below the voltage on pin 15, pin 3 should be near 0v. Confirm this.

Also confirm that pin 4 is near 0v.
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Old 28th November 2011, 07:48 PM   #18
manina is offline manina  Germany
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Actually, pin 15 and 16 are at tahe same voltage in the non-working one (0.07 and 0.06 respectively)

Pin 3 is at 0.07V while pin 4 is at 0.01V
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Old 29th November 2011, 06:25 AM   #19
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Post the DC Voltage on all of the pins of IC2. Copy and paste the following.

IC2
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 1st December 2011, 01:50 PM   #20
manina is offline manina  Germany
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Join Date: Mar 2008
Location: Where the work is
Here they are
IC2
Pin 1: 0
Pin 2: 0,07
Pin 3: 0,07
Pin 4: 0,01
Pin 5: 1,52
Pin 6: 3,41
Pin 7: 0
Pin 8: 30,13
Pin 9: 25,64
Pin 10: 25,69
Pin 11: 30,13
Pin 12: 30,13
Pin 13: 0
Pin 14: 5
Pin 15: 0,07
Pin 16: 0,05
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