HP laptop P.S. stuffed with silicon? NO PROB!

[kc8adu]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

Wtf!

what reaction do you get when you swallow a 1/4 cup of granulated draino?

[glutton4punishment]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

What DC resistance do you get measured right at two legs of either one of the output filter caps sitting at the edge of the board?

If I misunderstood your intent, I apologize, and will remove my post.

It seemed to me that a teenager was trying to get me to short out the 400v cap to get me to either electrocute myself or get me to pull off a big bang and spark to scare the hell out of me.

If there was no bad intent, I'm sorry, but at the end of the day, I didn't understand what you wanted. I thought if I tried to measure the DC resistance, with or without current, I'd either get the spark/bang or fry my meter.

[kc8adu]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

output=low voltage side.you likely have a short on the secondary(output)side.
rest assured that anyone suggesting you do something potentially deadly will get said post removed and a vacation!

[budm]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

post 18
"What DC resistance do you get measured right at two legs of either one of the output filter caps sitting at the edge of the board?" I post the picture with redlined to where to check the resistance, that is the output section, I should be more clear about the power supply should not be connected when you do any resistance reading, but I assume the common sense to kick in for the tester know what to do when check the resistance in the circuit.

"It seemed to me that a teenager was trying to get me to short out the 400v cap to get me to either electrocute myself or get me to pull off a big bang and spark to scare the hell out of me." How did you assume that? I do not know where I indicate to short out the 400V cap!
All we are trying for you to do is to find out if you have shorted circuits in the secondary side but sure having a hard time with it.
I am out of here.

[glutton4punishment]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

post 18
"What DC resistance do you get measured right at two legs of either one of the output filter caps sitting at the edge of the board?" I post the picture with redlined to where to check the resistance, that is the output section,

Sorry, I don't have a big screen, and I didn't see any markings on the pic you quoted

I should be more clear about the power supply should not be connected when you do any resistance reading, but I assume the common sense to kick in for the tester know what to do when check the resistance in the circuit.

"It seemed to me that a teenager was trying to get me to short out the 400v cap to get me to either electrocute myself or get me to pull off a big bang and spark to scare the hell out of me." How did you assume that? I do not know where I indicate to short out the 400V cap!
All we are trying for you to do is to find out if you have shorted circuits in the secondary side but sure having a hard time with it.
I am out of here.

I already apologized. Thanks for your help/

[ben7]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

So yeah, let's try this again.

Please measure the resistance across the two points budm marked in that picture. The power supply doesn't need to be plugged into the wall.

[glutton4punishment]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

So yeah, let's try this again.

Please measure the resistance across the two points budm marked in that picture. The power supply doesn't need to be plugged into the wall.

with a DVM, it starts at 1.8 ohms, within a second drops to 0.6 ohm, and is steady there.

thanks for the help!

[ben7]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

with a DVM, it starts at 1.8 ohms, within a second drops to 0.6 ohm, and is steady there.

thanks for the help!

Desolder the cord that goes to the laptop, taking note of which wire goes where on the pcb. Then, measure the resistance of those two points again. If there is no short, then the cord is bad.

[glutton4punishment]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

Desolder the cord that goes to the laptop, taking note of which wire goes where on the pcb. Then, measure the resistance of those two points again. If there is no short, then the cord is bad.

well there's a big diff from before, but I don't know what it means!

On the cap I measured before,(i.e., the one Bud told me to measure) it's 0.85 M ohms, and immediately slowly decreases in value. With the cord attached, it was 1.8 to 0.6 ohms, not M ohms.

On it's twin cap (the other output) it's 0.69 M ohms, and immediately slowly decreases in value.

Now what??

[ben7]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

well there's a big diff from before, but I don't know what it means!

On the cap I measured before,(i.e., the one Bud told me to measure) it's 0.85 M ohms, and immediately slowly decreases in value. With the cord attached, it was 1.8 to 0.6 ohms, not M ohms.

On it's twin cap (the other output) it's 0.69 M ohms, and immediately slowly decreases in value.

Now what??

The cord has a short inside it. You will have to get a new one. Or get the type of connector that goes into the laptop, and attach a new cord onto it yourself.

Do this with the cord desoldered:
Put your meter on dc volts, and plug the charger in. Test the voltage across that capacitor. You should see a voltage there, and the ticking sound will be gone too.

[glutton4punishment]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

The cord has a short inside it. You will have to get a new one. Or get the type of connector that goes into the laptop, and attach a new cord onto it yourself.

Thanks Ben!!!!!!!!

I cut off 2.5" from the cable where it meets the P.S. board, soldered it back to the board, and I'm back in the saddle again!

[ben7]

Re: HP laptop P.S. stuffed with silicon? NO PROB!

Thanks Ben!!!!!!!!

I cut off 2.5" from the cable where it meets the P.S. board, soldered it back to the board, and I'm back in the saddle again!

So the short was around the area of the strain relief on the adapter? That is a common spot for failures in these cables.