Electronics Forum | Sat Sep 11 13:45:23 EDT 2021 | kojotssss
Hi, check the Land pattern 0201 on the board, compare with another 0201. Could be different gap.,
Electronics Forum | Mon Sep 13 05:14:06 EDT 2021 | compit
A large pad nearby receives heat - the resistor pads heat up unevenly ?
Electronics Forum | Fri Sep 24 18:44:17 EDT 2021 | proceng1
This is what I do to determine if the oven recipe is the cause. Change the rotation that the board travels through the oven.
Electronics Forum | Fri Sep 10 15:15:09 EDT 2021 | majdi4
Hello to all , Could you help with this defect .. Tombstoning 0201 , always at the same place in board , only this component near to the coax connector..with a defect rate of 2 % ..All the process is perfect . i cheked : stencil design , SPI resul
Electronics Forum | Sat Sep 11 13:49:13 EDT 2021 | kojotssss
Most common causes of tombstoning in our factory: small amount of paste printed on the pcb, improper placement ( pick up process, picked up on the component metallization- large cavity in reel).
Electronics Forum | Mon Sep 13 17:39:02 EDT 2021 | duchoang
Agree. The big pad and part nearby made the paste on two ends of cap melted unevenly.Deposit more paste on the tombstone-ed pad will make it easier to melt. Nothing wrong with profile if everything else is OK. BTW, how to measure temperature on two e
Electronics Forum | Tue Sep 14 05:46:51 EDT 2021 | denism
To measure two 0201 pads, you need to solder two thermocouples for each component pin on different segments. Thermocouple wire should be 36AWG.
Electronics Forum | Mon Sep 13 07:27:50 EDT 2021 | denism
There may also be a problem with the a thermoprofile. Measure the temperature of both contacts of the component, if they heat up not evenly and the soldered lead heats up faster, then the problem is in the profile. To solve the problem of misalignmen
Electronics Forum | Tue Sep 14 19:19:23 EDT 2021 | dwl
Just for grins, try rotating the board 180 degrees before reflow. this might allow both sides of the part to reflow at the same time. Is it just that one part with the arrow? Its interesting that none of the other parts have the same issue despite a
Electronics Forum | Mon Sep 27 10:53:24 EDT 2021 | majdi4
Thank you all for your quick reply ! the problem is solved without making any intervention on line .. 0% defect rate for the moment .. for all of you who said "try rotating the board 180 °", we can't do that because the panel contains 2 boards head t
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