So i have posted about this laptop before, in my journey to fix it. However my journey took a huge detour when i got too comfortable with my motherboard repairing skills, and like the rookie i am, managed to put an 18650 3.7v battery to my Haswell i7 processor.
Thinking there was a short to ground, but literally creating a short to ground myself. VCORE which is the 3 coils that connect to the cpu on the motherboard, shows a direct short to ground, insisting to me that the processor is fried internally and dead.
However, my knowledge of these processors internals...
spirman
Member
Last Activity: 06-01-2018, 05:41 PM
Joined: 05-05-2018
Location: Texas
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Re: Asus g771jw questions
Rest in peace G771JW i bought off of Ebay, you will be missed. :'c
I cant believe i made such a dumb mistake.
Time to resell for parts or not working. Thank you for your input also.Last edited by spirman; 05-10-2018, 10:53 PM. -
Re: Asus g771jw questions
Processor wasnt the original issue, but after i fixed the original issue, it doesnt power up like its supposed to.Leave a comment:
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Re: Asus g771jw questions
Is it supposed to be so low after adding the 3.7 volts. Ffs i really hope this isnt damaged.Leave a comment:
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Re: Asus g771jw questions
For reference, a board i have that i know works. Has a resistance to ground of around 14-20 Ohms. The one on this board is showing some 1.4 ohms or so. It's not looking good :cLeave a comment:
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Asus g771jw questions
So basically, whilst trying to repair this laptop board i may have made a mistake. I'm trying to determine whether or not my mistake was enough to have completely destroyed the processor. I don't think i did but i will explain.
Basically i was checking the power supplies and as i am new to this, i found the coils around the cpu thinking they were a power supply. Using my multimeter i found it went straight to ground and thought it may be a short to ground. As such i decided to use an 18650 3.7v battery (as i didnt have a DC power supply) to find this short. It ended up getting warm... -
Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Ill let yall know as it goesLeave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
I dont have one of the components on me readily, but i managed to manufacture my own
....
Last edited by spirman; 05-06-2018, 02:16 PM.Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
By the way do you happen to have that motherboard diagram of the similar board? Unless of course you paid money for it or something then i understand.Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
oddly enough i just found another forum somehow mentioning the same problem? [url]https://www.abcelectronique.com/forum/showthread.php?p=854427[/url]
I guess this problem is more common yes? xDRe: ASUS G771JW 5 Volt switched rail...common yes? xDRe: ASUS G771JW 5 Volt switched rail undervolted/missingLeave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Thank you so much, you've helped me a lot. I would have never known the correct part. Also how did you come up with that part name, and how did you know what it did? Experience?Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Also as for the load switch, Using this datasheet When the laptop is switched on, Pin 4 voltage is 1.66v and pin 3, which looks more like the gate, has 0 voltage, and the 4 pins connected to 5volt power supply, are 5 volt.Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Alright ill do more research and ill get back to youLeave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Also is this component resposible for why i dont have full 5 volts? And if so can you explain to me if i may ask? I'm new to board repair and if i can learn something new it can help loads.Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Thank you so much, but also the component you mentioned, the BAT54S, It looks like it only has 3 pins on it, whilst the original SMD had 6?...Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Please ignore the Flux mess xDLeave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
I tested the load fuse and its the exact component you showed on the board. Before the load switch, there is 5 volts. After that loadswitch there is 1.66 volts. Ive shorted these pins and attempted to turn it on, and for a moment the fan spinned up but shut back off again (Likely as a protection mechanism).
Perhaps this is relating to another component on the board that was visibly burnt and damaged, which i replaced with a P type sot363 double mosfet i pulled from another board. The pins of...Leave a comment:
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Re: ASUS G771JW 5 Volt switched rail undervolted/missing
Diode mode shows no shorts to ground on any of the rails. This is a very confusing repair....Leave a comment:
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ASUS G771JW 5 Volt switched rail undervolted/missing
So i've been working on a board of mine from an asus laptop. I've checked for shorts to ground which there are none. 5v 3.3v 1.5v and all power supplies are operating at their correct voltages. However when i got the laptop there was a blown SOT363 what looks to be a double mosfet. I've since replaced it but i still have issues. On the 5 volt rail, the fan does not spin, and one of the USBs doesnt power up. I checked the 5 volt rail there with my multimeter and it says 1.66Volts.
Does anyone know what could be causing such a drop of voltage? Is there some kind of faulty controller... -
Re: New Members - please post your introductions here
Im new here and getting into board repair, looking for some assistance.Leave a comment:
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