Re: Building a cheap ACF tape bonding machine
any bonding diy one with out Vacuum are useless to use ACF
any bonding diy one with out Vacuum are useless to use ACF
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Re: Building a cheap ACF tape bonding machine
You mean use vacuum suck the screen to the work base, that is A wonderful idea, I know, because the Earth is spinning..and ..... earthquake...... .
Last edited by capwizard; 12-29-2016, 05:11 PM.Comment
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Re: Building a cheap ACF tape bonding machine
Where I can buy this X-Y micro adjustable table (I dont know the name! pic1)?
I took those pictures two months ago. I need xy table to finish this project...
PS: is 3D printer precision enough to do this job, I know nothing about machinarium.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Building a cheap ACF tape bonding machine
so what did you use for the heated head? I am trying to put together a bonding machine, hungry for info.Now that ACF tape is available to buy and doesn't cost an arm and a leg (it's still pricey, but 50m of tape for $80-something sounds fair to me, considering the size of a tab), i have decided to build my own bonding machine.
The few builds i have seen use a commercial bonding head and that costs $3000 to $5000 - OUCH. I was thinking more like $50.
I have read the datasheet for the Hitachi ACF tape and it occurs to me that the requirements are not very stringent - the tape should reach 160 to 180C for 20 to 30 seconds, at a certain pressure applied by the bonding head. A suggested temperature (305C) for the bonding head is also given in the datasheet, and the only requirement for the head's shape is that it must have an even surface where it presses down on the tab (duh). There are no slopes required as it is with soldering BGAs, temperature just needs to get up there as fast as possible, stick there for 30 seconds then cool down. So the design of the control circuit is also easier.
I have already chosen my heating element (it's a surprise, you'll laugh) and completed the design of the control circuit - all that's left is making the PCB. There is no microcontroller and no firmware involved, it's all analog.
The output drives a relay so any kind of heating element can be used, and the input is a normal type K thermocouple. Control is accomplished via a couple pots and switches. The circuit turns the heater completely off once the time set has elapsed, and can also run a fan if desired.
Anyone else interested?Comment
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Re: Building a cheap ACF tape bonding machine
Nothing for now, no time/space/life stuff got in the way. Don't know whether i will have any more time to work on this project anytime soon, but will update if i do.A working TV? How boring!Originally posted by PeteS in CAComment
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Re: Building a cheap ACF tape bonding machine
You would think the Chinese would be selling a cheap bonding machine for like $500 by nowI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Building a cheap ACF tape bonding machine
Hi there, i am interesting in your project a home made ACF bonding machine. Did you made it, if yes can you help to make one for me?Comment
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Re: Building a cheap ACF tape bonding machine
Just got a job fixing tvs again & coming across loads of bonding problems, cant afford to buy one of those fancy bonding machines but would love to make my ownComment
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Re: Building a cheap ACF tape bonding machine
just wondered could you help me build oneComment
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Very interested in your project, I have just got a new job fixing TV's again after many years, I have not got the money to buy one of these fancy bonding machines. I would appreciate your help in making my own. (I hope this is not too much to ask) Just to add, I am based in Manchester UK.Now that ACF tape is available to buy and doesn't cost an arm and a leg (it's still pricey, but 50m of tape for $80-something sounds fair to me, considering the size of a tab), i have decided to build my own bonding machine.
The few builds i have seen use a commercial bonding head and that costs $3000 to $5000 - OUCH. I was thinking more like $50.
I have read the datasheet for the Hitachi ACF tape and it occurs to me that the requirements are not very stringent - the tape should reach 160 to 180C for 20 to 30 seconds, at a certain pressure applied by the bonding head. A suggested temperature (305C) for the bonding head is also given in the datasheet, and the only requirement for the head's shape is that it must have an even surface where it presses down on the tab (duh). There are no slopes required as it is with soldering BGAs, temperature just needs to get up there as fast as possible, stick there for 30 seconds then cool down. So the design of the control circuit is also easier.
I have already chosen my heating element (it's a surprise, you'll laugh) and completed the design of the control circuit - all that's left is making the PCB. There is no microcontroller and no firmware involved, it's all analog. The output drives a relay so any kind of heating element can be used, and the input is a normal type K thermocouple. Control is accomplished via a couple pots and switches. The circuit turns the heater completely off once the time set has elapsed, and can also run a fan if desired.
Anyone else interested?
Regards
PatrickComment
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Re: Building a cheap ACF tape bonding machine
Just for your information. Here in South Africa there was a guy that imported one of these bonding machines from China. Upon arrival at customs the unit was sent back to China. The reason being that Samsung Electronics have arranged an agreement with the government to block these machines so as to protect the jobs of the locals that are assembling TV's here in South Africa. Nice hey.Comment
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A working TV? How boring!Originally posted by PeteS in CAComment
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
I have been trying to build this engraving machine for last few months it has very challenging to get the part together
I had bought a very small engraving machine a few years and it sat in the box it came in because I could not find a reasonable priced laser controller and the same thing about the the motor controller ( plus the table was to small for what I want to do with it )
I have some challenges about the machine controller as well because I want an offline function so I can run the project with out having a computer hooked to machine controller
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Now this is an electronic machine, unlike the old fashioned sort where the pedal was a big resistor in series with the power to the motor. Here, the pedal is just (I think) a variable resistor fed with a 5 volt supply, and limited to a current of 5 milliamps. Assuming that... -
I've been seeing a lot of the new TVs (samsung and LG only i think) maybe 1-2 years old suffering from sudden panel death and have been over 50% successful bringing them at least most of the way back to functionality if not all the way, with the tape masking of the LVDS pins method.
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