I don't have reballing equipment but have done a few successful reflows with a heat gun and temperature control. I see Ebay sells GPU's that have been "pre-balled" with new solder balls. I was wondering if these could be a viable option to reflowing without having IR stuff etc. It's a cheaper option than buying a new MB......if it works. I can see a few problems with it i.e. I would be basically doing a reflow but on a re-soldered GPU and there may not be any advantage over a normal reflow. Then again the solder would not be suffering the same problems as the original manufactured item. Has anybody tried it?
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Re: Pre-balled GPU versus reflow
It's a huge pain in the ass either way. To install a pre-balled chip you'll still need to do the hardest steps of BGA rework, which are taking off the old chip and cleaning the board. And if you don't melt all the balls under the new BGA chip at the same time, you'll break it. It's almost impossible to heat the chip uniformly with a simple heat gun.
To add to that, in most cases you'll have to reball anyway the chips that you get pre-balled, because the Chinese tell you their chips come with leaded solder, but once you get the chip you easily figure out it's something else (it doesn't shine).
Why? Well, attempting to solder a lead-free chip with a heat gun... well, if you manage it from the first 50 tries, let me know. Just throwing some numbers out: Lead-free solder requires 235-240C to fully melt. At 250C the BGA blows up and shorts internally. The margins are very very tight. With leaded solder you at least have a higher chance of success.A working TV? How boring!Originally posted by PeteS in CA -
Re: Pre-balled GPU versus reflow
I was thinking along those lines too. It is not a worthwhile option I guess. One day I'll lash out and buy an IR reball station because the GPU is always a source of MB failure.Last edited by sparker1; 06-29-2013, 06:53 PM.Comment
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Re: Pre-balled GPU versus reflow
some bga we got from online market need to reball again. i dont know why . when ask reseller they dont know what type solder balls use, any body know which store have good bga.
sparker1 from my experience u can buy reball kit but the most important is to make sure the mold and design is quality. fit not loose when u close the top cover stencil. if not fit u become headache to allign because some ball can stick together when not in good positionComment
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Re: Pre-balled GPU versus reflow
Good advice. Thanks SasserComment
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Re: Pre-balled GPU versus reflow
I always reball my GPU, and rarely have faulty ones. Stencils aren't expensive and its easy after few tries.
And doing reball with an HotAir gun is suicide. At least get a Preheater and rework station because you need a lot temperature control in this job, and of course get some good flux it makes this job a lot easier. Good luck.Comment
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Re: Pre-balled GPU versus reflow
Senchire i also agree the preheater help a lot. I have honton ht-1212 which help me melt the solder ball .just set up temp to 220 and put on prehear then look till solder ball shine n meltComment
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Re: Pre-balled GPU versus reflow
Yep when doing reflows people should know that PH is doing more then 70% of the job. Top Heater is just for finishing it up
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This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
This specification for the Acer TravelMate P2510-G2-M-54Q3 + Option Pack Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the P2510-G2-M-54Q3 + Option Pack boardview and P2510-G2-M-54Q3 + Option Pack schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...09-06-2024, 08:00 AM
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Hello, I'm a beginner for micro soldering. Right now I have some difficult to solder a qfn 20, I guess I put too much solder on the thermal-ground pad, the result is a corner of chip wich don't touch the board (last try).
I use a wire solder with hot air, I tin the board and chip before with iron and I use good flux.
I will have to solder a LVDS connector (40 pins, laptop pc), I saw a solder paste in seringe, good quality (it does not scatter).
See the test :
https://youtu.be/bNAzC-EvqHs?t=1767
With hot air from bellow the board, that's... -
REWORK FLUXES Multifix 425-01 and 450-01 are tacky fluxes designed for use in a wide range of electronics assembly and rework processes. They represent a range of activities and residue levels to meet different customer requirements.
- No Clean Formulations
- Low residue
- Range of activity to deal with different component solderability
- Halide free
- Suitable for dispensing
- Compatible with solder coatings and/or No Clean flux cored solder wire product range
Both products are supplied in syringes or cartridges for application by dispensing....10-07-2024, 06:02 AM -
I heard somebody suggested a way of repair faulty led light bulb which I have never heard of. The way is to put the led light bulb inside a microwave oven and turn on the microwave oven for a few seconds. He said that faulty led light bulb is usually caused by poor solder joint between the led and the pcb. Putting the bulb inside the microwave oven for a few seconds will heat and reflow the solder joint making it works again.
Is that possible? I do not want to try this unless I have a spare microwave oven.
(I do not mean to suggest somebody to try this. It may be...
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