Re: HP 4720s Laptop does not respond to the power button
I did remove battery, but it was less then 5 min.
Regarding U90 I'll do my best to find it today when kids go to sleep.
n3v3n
Member
Last Activity: 11-06-2015, 02:00 PM
Joined: 01-15-2014
Location: Croatia
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Re: HP 4720s Laptop does not respond to the power button
Chip doesn't look like this when you are just looking at chip, if you are talking photo with big zoom than you can see scratches.
I'm talking about lower left corner.
@khaahk
I couldn't find U90, I can find it on schematics you sent me bu can't find it on mainboard.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
can't find U90, where is his location? I have found U91, U92 .... but can't find U90.
Anyhow, I think I have found problem. My PCH looks broken in corner.
[URL="http://s25.postimg.org/qe07cwdgf/PICT1977.jpg"]link to full size image[/URL]Re: HP 4720s Laptop does not respond to the power button
can't find U90, where is his location? I have found U91, U92 .... but can't find U90.
Anyhow, I think I have found problem. My PCH looks broken in corner.
Last edited by n3v3n; 03-19-2014, 03:34 PM.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
I had to restart because I wanted to turn off Digital drivers signing. Windows 8 is installed.
Laptop know to switch off while I was working in windows. Then I realized that one screw broke on heat sink which is "cooling" PCH. I have repaired screw and put heat sink back to place. (that was 2 months ago).
Forgot to mention, from day 1 PCH was really hot while working on laptop.
switching off and on is random, sometime while in POST (showing HP logo) and sometime while booting...Last edited by n3v3n; 03-19-2014, 06:35 AM.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
I will take pictures of whole board today when I come home.
But I'm not talking about video chip, I'm talking about chipset.
[URL="http://s25.postimg.org/an5xrsffj/Mail_Laptop_HP_PROBOOK_4520_S.jpg"]LINK [/URL]Re: HP 4720s Laptop does not respond to the power button
I will take pictures of whole board today when I come home.
But I'm not talking about video chip, I'm talking about chipset.
[URL="http://s25.postimg.org/an5xrsffj/Mail_Laptop_HP_PROBOOK_4520_S.jpg"]LINKLeave a comment:
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Re: HP 4720s Laptop does not respond to the power button
that was my question from start.
If chipset is fuc....d, can that be problem with powering on?
And, answer is no, I didn't try to reflow. Better idea is to reball chipest. I have equipment for that.
this is the link of [URL="http://postimg.org/image/c97pwxrmj/full/"]full size picture[/URL]Re: HP 4720s Laptop does not respond to the power button
that was my question from start.
If chipset is fuc....d, can that be problem with powering on?Last edited by n3v3n; 03-19-2014, 05:19 AM.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
Laptop worked till this Sunday, I was working and I had to restart laptop and then in BIOS computer turned off and on again and It go like that indefinitely. So I removed battery and reattach battery and it started and it started to turn off and on again and I have removed batter again and from that point nothing.
Regarding measure, results will be around 21h.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
if it is grey wire, pin 6. there I get 1.3V. Battery is still around 80% full.
When I connect battery to mainboard and connect charger light doesn't show.
And no, nothing is spilled on laptop. I know because it's my laptop.
And regarding power adapter. I get 19.97V on + and -, and I get 15.8V on - and smart pin.Last edited by n3v3n; 03-19-2014, 03:26 AM.Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
I didn't understand what you mean about PIN 7 on DC In
here is better picture...Leave a comment:
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Re: HP 4720s Laptop does not respond to the power button
I will check those 8V
Problem is same on battery. It won't start.
I had issues with laptop turning off by himself even in BIOS (like his chipset is overheating).
Yes, my ProBook have smart pin on power adapter.Leave a comment:
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HP 4720s Laptop does not respond to the power button
Hello,
HP 4720s Laptop does not respond to the power button
Now, if there is any good soul to direct me to where to measure with a multimeter to see what could be a possible problem.
And another question, if the southbridge is "broken", laptop should start or that could be the cause of not powering on?
And if anybody have schematics or HP Pro Book 4720s that would be great.
regards,
n3v3nLast edited by n3v3n; 03-17-2014, 06:09 AM. -
Re: 50" insignia turns on and off repeatedly
Hi,
I had same problem with my LG 32LD750, he was also turning on and off repeatedly.
Solution in my case was unplugging ribbon cables and cleaning them. After reconnecting cables TV is working as it should.
did you try that?Leave a comment:
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