Re: Sapphire HD 7770 possible short
I'm still waiting the rite parts from China....
manthos1969
Member
Last Activity: 06-26-2016, 11:00 PM
Joined: 03-29-2016
Location: Thessaloniki
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Last edited by manthos1969; 06-26-2016, 11:00 PM. -
Re: Sapphire HD 7770 possible short
Hey,dont be sorry,I'm just a noob with a nice puzzle of physics in front of me and I dont know yet how to recognize the puzzle's pieces,so that when asking for help,if you or some other guy wants to help it's welcome, when and how doesn't really matter,it's a hobby for me and I don't have time limitations,only the pleasure of learning.
You caught me
,an old man's eyes make mistakes.
Here are the right measures:
Q623 source to ground...Leave a comment:
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Re: Sapphire HD 7770 possible short
Hi,I'm back again.
I started to remove the mosfet from Q621 because the resistance values(source & gate) were similar to the resistance from 12V rail.
After i got Q621 removed, the 12V rail to ground resistance changed to high values.
I gave the gpu a try powering it with an old pc,the pc starts now but enters power safe mode in 3 seconds,I think that is progress.
I have 2 suspicious mosfets (Q601,Q611)for the next step because the resistance values looked wrong to my old nooby mind.
Actually the mosfet...Leave a comment:
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Re: Sapphire HD 7770 possible short
Hi thank you for replying to my problem.
I'm out of city for a few days and I can't do your suggestions right now.
Actually I have already started trying some fixes on my own (it was a wrong assumption of mine,nothing changed) and I removed the MOSFET Q703 (I damaged it
)from the board because the source was shorted to the 12v rail and I was not getting any resistance between the gate and 12v rail when I charged the source,so I ordered a new MOSFET and it's on the way.
I'm looking forward your suggestions when I'm...Leave a comment:
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Re: Sapphire HD 7770 possible short
Hi,your gpu have a dangerous short if an mosfet exloded after the psu's power safe mode.
First take a look the Nexus 1000w psu health because an mosfet explosion happens on gpu and the psu's power safe mode won't work properly to stop the shorted circuit.
My opinion is to give it (gpu) to an technician because in your case the gpu is dangerous for your personaly health and for other pc components.
Sorry for my poor english....Last edited by manthos1969; 05-11-2016, 03:13 PM.Leave a comment:
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Re: Sapphire HD 7770 possible short
I forgot to upload my power connector measurements...
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Sapphire HD 7770 possible short
Hi
My 7770 oc edition wont let my pc to start when 6-pin power cable plugged on.
[URL="http://www.sapphiretech.com/productdetial.asp?Pid=E526513F-4894-495A-8859-972F2F488D42&tag=download&lang=eng"]http://www.sapphiretech.com/productdetial.asp?Pid=E526513F-4894-495A-8859-972F2F488D42&tag=download&lang=eng[/URL]
The cpu and case fans spin only for 1/4 of a second and the system wont start,I'm using a 430w psu at this moment,I know there is a little bit of undervoltage but I don't push the gpu with extreme games e.t.c.
I tried my 7770 to another... -
Re: New Members - please post your introductions here
Hi guys, my name is Matthew and I am from Greece.
I am glad that I am now a member of this forum because it is truly a treasure of information and experiences of its members.
My hobby is to give it a second chance in essentially dead devices.Leave a comment:
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