Quote from: RRZP028 on January 13, 2021, 09:11:37 PM

Well, I'm a beginner in that, today I successfully replaced my first chip, I replaced it after a few attempts, chip No. 01 after that it gave an error on chip 34, I still haven't been able to solve it, can you tell me how to glue a refrigerator for chip and what temperature do you use then and what when should you glue the chip to the hash board

When it shows Asic 0, I first control the first chip, and then the last. I look at which test point the parameters are not good and after that I start with the control of the chip, first I take off the cooler and check if there are soldering balls then I try to reattach the chip at a temperature of 400 degrees Celsius, if that doesn't help I take off the chip and first try to I put it back again because I clean it nicely, if it doesn't help you either, then I mount a new chip, after that I measure the resistance, if everything is OK, then I go to test and check the values at the checkpoints again.

I use a heatgun set at 315 degrees C set at low airflow to remove/attach heatsinks and chips.

Attaching heatsinks on S17 boards is pretty tricky. For S17 and S17 pro, I've been removing most residual solder from the heatsink and adding what I think is the correct amount of solder to the top of the ASIC. I put some tacky flux on the top of the chip, then heat the heatsink with my heatgun for ~20 seconds and set it down on the chip. There is then a small window of time where you can adjust the placement of the heatsink. If you are not quick enough, the solder holding the chip to the board can melt and then you can shift the chip.

On the S17+, that technique didn't work for chips with the smaller heatsinks. So on those, I prepare the chip and heatsink the same way, but then just place the heatsink on the chip and heat it directly until the solder flows.

For attaching chips, I remove the solder from the board with solder wick, apply tacky flux to the board and place the chip in position, then apply heat for ~45 seconds. For new chips, I use a stencil to apply solder paste to the chip and melt the solder before placing it on the board. Nearly every time I do this, all connections are not made, so I add solder paste with a small syringe to the edge of the chip, reflow, add more flux, reflow again, and clean up any excess solder with an exacto knife while the solder is still liquid. Pretty tedious process.

Flux I use: https://www.chipquik.com/store/product_info.php?products_id=310003
solder paste I use: https://www.chipquik.com/store/product_info.php?products_id=470006
solder wick: https://www.chipquik.com/store/product_info.php?products_id=640002

Heat gun I use: https://www.masterappliance.com/proheat-1500-lcd-programmable-professional-heat-gun-kit/