Re: HP Envy 15 cannot charge battery!
Sorry my solution dint work for you. I am really confused by your last post.
Sorry my solution dint work for you. I am really confused by your last post.
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Re: HP Envy 15 cannot charge battery!
Thank you though, it was worth a try! Tomorrow I plan on replacing a load of components, I might as well. Can someone please advise which ones are likely to effect?
Regards,
GrahamComment
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Re: HP Envy 15 cannot charge battery!
Start in page 41 of the schematic(charging ic) the ic number is PU11. Look for pin 1, you will know by the white dot next to the pin. Once you locate pin 1 start counting counter clockwise find pin 2 and 14.
PU11
pin 2= check voltage should be 3.3v (charge enable pin). If there's no voltage in pin 2 look for KBC U33(page 33) look for pin 102(charge enable pin) if there's voltage replace PR155.
pin 14= check voltage with battery should be 12v(battery charging pin). If there's no voltage in pin 14, unplug battery and charger and check PR2(diode test).Comment
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Re: HP Envy 15 cannot charge battery!
Your help so far is very appreciated, thank you.
So far - with ac adapter plugged in and NO battery
PU11 PIN 2 is 3.3V
PU11 PIN 14 is 19V (should be 12V!)
Have not looked at U33 (I assume I don't need to because PU11 PIN 2 is 3.3V?)
Should this be 3.3V even with NO battery inserted?
What should I do now? PR2 looks more like a fuse although I don't really know. How do I test this? I tried test probes each way and had 0 ohms on both motherboards.
Thanks!Comment
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Re: HP Envy 15 cannot charge battery!
with AC IN and battery OUT, PU11 pin 2 is 3.3V
with AC IN and battery IN, PU11 pin 2 is ~0V
I assume these are the correct signals coming from U33?
with AC IN and battery OUT, PU11 pin 14 is 19V
with AC IN and battery IN, PU11 pin 14 is 12V (override voltage from battery?)
therefore PU11 is faulty? what else could cause 19V on pin 14?Comment
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Re: HP Envy 15 cannot charge battery!
actually, pin 2 is 3.03V not 3.3V in non charging motherboard, and it IS 3.3V in charging motherboard!Comment
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Re: HP Envy 15 cannot charge battery!
An electrical engineer at work swapped the PU11 IC's around and still the result was the same. Non working motherboard was able to charge and working motherboard cycles between charging and not charging.
On swapping back, both motherboards are playing up, the LED flickers now and the U33 gets hot. I think there is either a short or missing contact.. I will look in to this tomorrow
Any more suggestions?
Kind RegardsComment
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Re: HP Envy 15 cannot charge battery!
check all connections...now that you have a schematic you can check the charge system... since both boards are doing same thing that schematic is all you got for any ideas to what it should be....let me study it and i will throw some idea's your way....An electrical engineer at work swapped the PU11 IC's around and still the result was the same. Non working motherboard was able to charge and working motherboard cycles between charging and not charging.
On swapping back, both motherboards are playing up, the LED flickers now and the U33 gets hot. I think there is either a short or missing contact.. I will look in to this tomorrow
Any more suggestions?
Kind RegardsComment
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Re: HP Envy 15 cannot charge battery!
Thanks! I still think it could be PU11, what else could cause the 19V on pin 14? I think it wasn't soldered in place properly, the IC doesn't have legs, just contacts.Comment
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Re: HP Envy 15 cannot charge battery!
by the way is PR155 a diode? on both motherboards I am getting 100k-ohms each way on this.
I also checked some voltages around U33, getting some 3.33V on both motherboards, but PR155 on the charing board is 3.33V and on the non-charging board is 3.03VComment
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Re: HP Envy 15 cannot charge battery!
Yes PU11 is a QFNL (quad flat no leads)and some of the pins are shorted so don't keep powering it up or you're going to make it worst, you will need to resoldered it. Also PR155 is a resistor and is fine if you're getting 100kohms.Last edited by opamp; 01-30-2013, 01:07 PM.Comment
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Re: HP Envy 15 cannot charge battery!
yea I haven't touched it since, so do you have any idea what I should do next?
I tried to solder a tag onto the U33 pin 102 but its too small, i got it once and realised I did the wrong pin, doh!Comment
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Re: HP Envy 15 cannot charge battery!
Also check PQ15 I think is bad that's why you're getting 19v on that bus line. PQ15 is an Nchannel mosfet so place DMM in diode mode and place neg- prove on pin 8 and pos+ prove on pin 1, you should get around 500ohms. Now flip the proves aorund and you should get no reading. If you do get a reading replace it.Comment
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Re: HP Envy 15 cannot charge battery!
okay thanks, I will check it out tomorrowComment
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Re: HP Envy 15 cannot charge battery!
what does PQ15 refer to? I have attached a picture, I found the text but can't really see what it points to.. I think it is one of those legless squares, which I will not be able to test, but I can try to replace..
CheersAttached FilesComment
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