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Old 08-03-2016, 03:38 PM   #81
bianchi77
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Default Re: DV9500 blue LED ring of death ?

ok, how about I make a paralel of 3 500mA fuses, it has about 150 mA fuse resistance, doesn't it....
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Old 08-03-2016, 03:57 PM   #82
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Default Re: DV9500 blue LED ring of death ?

what do need to see in TL331 in osciloscope ?
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Old 08-03-2016, 08:44 PM   #83
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Default Re: DV9500 blue LED ring of death ?

You are thinking of resistance instead of current. Three 500mA fuses in parallel will make the combined maximum current 1.5A. That's obviously the opposite of what you want. There is no way to combine fuses to make the maximum current smaller.

The output of the TL331 should be a square wave bouncing between 0V and 19V. You would see the same shape as this (different voltages, but the same shape). The red line is pin 1, the green line is pin 3, and the blue line is pin 5.
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Old 08-04-2016, 12:04 AM   #84
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Default Re: DV9500 blue LED ring of death ?

How about using thin wire replacing fuse?
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Old 08-04-2016, 04:33 AM   #85
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Default Re: DV9500 blue LED ring of death ?

For a test only, can I use 5V 1A or less supplying the board ?
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Old 08-04-2016, 06:14 AM   #86
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Default Re: DV9500 blue LED ring of death ?

Did you test the circuit for a short? (One probe on ground and one probe at PQ61 pin 1)

Testing without the transistors isn't very useful. Nothing interesting will happen if there isn't a short. You could test the new transistors with a 100-150mA fuse. But how expensive is a fuse? Is it really much less than the transistors? It might be best to just try the new transistors. I assume you are getting more than 1 of them.

That little circuit will run on 5V or 19V or anything in between. You can try it first without a new PD16 diode so at least you won't burn up a diode.
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Old 08-04-2016, 06:22 AM   #87
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Default Re: DV9500 blue LED ring of death ?

Ok, I will have a look on PQ61 pin 1 to ground....
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Old 08-04-2016, 06:24 AM   #88
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Default Re: DV9500 blue LED ring of death ?

CN17 pin 3 4 and PQ61 pin 1 continuity test...if beep...it's short...
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Old 08-04-2016, 06:52 AM   #89
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Default Re: DV9500 blue LED ring of death ?

PQ61 to GND continuity test....PASS...it's not shorted..
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Old 08-04-2016, 06:55 AM   #90
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Default Re: DV9500 blue LED ring of death ?

How can "NBSWON1#" connected to this area ?
Is it possible to use "NBSWON1#" easily ( solderable area ) to put wire and connect to GND to turn on ?...
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Old 08-04-2016, 07:11 AM   #91
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Default Re: DV9500 blue LED ring of death ?

It can't be turned on until you get this circuit fixed.

The easiest way to turn it on without putting the motherboard back in the case is to just remove the power switch board from the case and use that. It's only held on by 1 screw.
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Old 08-04-2016, 07:20 AM   #92
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Default Re: DV9500 blue LED ring of death ?

but there's a black membrane to connect (CN7) to power button on top...that's abit annoying since it's sticking and I don't want to move it....idea ?
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Old 08-04-2016, 07:31 AM   #93
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Default Re: DV9500 blue LED ring of death ?

The black cable should come right off. Just gently pull it up from one side to the other. I've removed many of them without damage.
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Old 08-04-2016, 08:06 AM   #94
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Default Re: DV9500 blue LED ring of death ?

I'm interested making this as a fuse :
https://www.eeweb.com/blog/circuit_p...r-power-supply
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Old 08-05-2016, 05:42 AM   #95
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Default Re: DV9500 blue LED ring of death ?

I'll wait for the transistor,fuse and diode coming, I'll post something after ready
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Old 08-05-2016, 08:35 AM   #96
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Default Re: DV9500 blue LED ring of death ?

Alright.

By the way, that electron fuse circuit isn't a very good one. You lose a couple volts on the output. For some circuits being tested that might be okay, but I'm sure there are better designs to use.
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Old 08-05-2016, 07:19 PM   #97
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Default Re: DV9500 blue LED ring of death ?

Where is Ich8m located on board ..it s related with nbswo n isn t it?
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Old 08-05-2016, 07:24 PM   #98
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Default Re: DV9500 blue LED ring of death ?

Yes I ve removed black membrane.. how can I turn it on without it..? Manual push button to pin 3 cn7
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Old 08-05-2016, 07:57 PM   #99
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Default Re: DV9500 blue LED ring of death ?

Pin 3 of CN7 to ground. Or even better.. just plug the black cable into the power button board and push the button.
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Old 08-05-2016, 07:59 PM   #100
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Default Re: DV9500 blue LED ring of death ?

I don't want plug in n out black membrane.. where s the open solder able pin for it on the board?
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