Re: Red glue around the GPU
Yes you need to remove it. Heat to 125 deg C and it will soften and can be removed easily with a toothpick
godin
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Last Activity: 03-08-2015, 02:26 PM
Joined: 12-23-2011
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Re: DV6000 (DV6809) Power problem.
Look on the far right of the drawing in the blue ovalLeave a comment:
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Re: DV6000 (DV6809) Power problem.
If you can get your head round the language these 2 docs will help. Learn how it works on a DV2000 schematic and cross reference to your AT3 and you should develop a really good understanding of the whole power theory.
Good luck...Leave a comment:
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Re: Toshiba Satellite L500 - No power on
Try reseating the memoryLeave a comment:
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Re: No sound, USB, or webcam on Satellite L505D-LS5006
You may have some temporarary success by "reflowing" the chip with a hot air gun. You will not be able to remove and replace without specialised equipment though. The equipment is too expensive to buy for a one off repair, maybe there is someone where you are who can do it for you. Bon chance!Leave a comment:
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Re: poor mans reballing
I would be inclined to agree, your chances of success are infinitely higher by just reflowing if you don't have the equipment to reball. Use a good flux, make sure you get hot enough to melt all the solder and keep it liquidous for a time. It is difficult to get it right using the proper equipment, you may get some to work for a while. Good luckLeave a comment:
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Acer Aspire x1700
Hi,
I am thinking of bidding on this as an introduction to fixing PC motherboards.
[url]http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=140677858225&ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649[/url]
I am currently learning laptop boards and am getting proficient at diagnosing power faults and rectifying them, BGA reballing etc. I want to get into desktops too.
Any advice on whether it might be a good start? It is dead and has been diagnosed as the motherboard being defective. Are schematics available?
Many thanks,
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Re: Amtech flux for reballing
Definitely get a no clean as you are not going to clean under the BGA!
Amtech Gel Flux 4300/LF-4300-TF is what I am using with no problems, it is reckoned to be the one to go for by those in the know.Leave a comment:
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Re: Anyone reccomend a place to get schematics
+1Leave a comment:
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Re: Anyone reccomend a place to get schematics
[url]http://www.laptopschematic.com/hp-compaq-nc8230-nc6230-circuit-diagram/[/url]Re: Anyone reccomend a place to get ...diagram/[/url]Leave a comment:
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Re: Anyone reccomend a place to get schematics
You need the board number of the manufacturer (not HP) and I bet it's on this page.
[url]http://lqv77.com/2010/12/26/laptop-hp-compaq-schematics-diagram-collection/[/url]
Good luckRe: Anyone reccomend a place to get ... /> Good luckRe: Anyone reccomend a place to get schematics
You need the board numberLeave a comment:
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Re: Oscilloscope
Now that makes perfect sense to me. However not to Th3_uN1Qu3 and I still don't understand why. If it is floated then it has potential above ground.
In the example schematic it is not floating please can you explain MR uN1Qu3....Leave a comment:
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Re: Oscilloscope
.....and you should be able to connect the ground clip to the negative grounded DC leg of that rectifier output. Shouldn't you??...Leave a comment:
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Re: Oscilloscope
Me too, confused as hell. I can't see the problem with the smps but bow to greater knowledge.
How come if it is earth and not possible to clip to is it not a shock hazard on the casing? Thinking specifically of a PC power supply.
If you connect your scope clip to ground and not anything above ground what can be the problem. I am missing something!
If a filter cap is passing AC to ground then ground must be ground.... mustn't it?
If you float with an isolation transformer and float the earth then I can understand that there...Last edited by godin; 01-04-2012, 03:06 AM.Leave a comment:
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Re: Oscilloscope
Do you mean an isolation transformer that floats the ground too and just leaves a floating AC with no ground connection to the neutral?...Leave a comment:
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Re: Oscilloscope
I must admit I am accepting it at the moment but not truly understanding. I will have to think more. Having looked at an smps schematic, the bridge rectifier is before the transformer which is not something I have encountered before.Leave a comment:
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Re: Oscilloscope
Thanks, I guess the safe thing to do is always check to see if there is a voltage between what you are about to clip to and the ground clip!Leave a comment:
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Re: Oscilloscope
I thought I understood this now, but I still do not understand the reason for this.
Would you mind explaining please?
Many thanks...Leave a comment:
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Re: Oscilloscope
Yes it is completely open circuit from input to output...Leave a comment:
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Re: Oscilloscope
That was the case with the one in the video I posted, but the guy disconnected the earth from the isolated side to make into what he called a technicians isolation transformer as opposed to the domestic one that it was manufactured to be.
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