Replacing and Soldering QFN Chips - Mitch's Microsoldering Tips #2

[@f.k.b.16]

Great tip about resting your hand for stability! 🤓😜

[@MicroMageRepair]

Good stuff Mitch, Added it to my "Useful for Everyone" Public Playlist.

[@amirb715]

after so many times re heating that poor chip and cooling and heating again at 360C, yes the chip is soldered finally but is it gonna be alive?

[@robinsondrob]

This method is good, i tried it a few times and had good results, I have a 32 pin qfn to replace, and my question is - manufacturer recommends max 260 C reflow temp, so what should I set the hot air gun temp to?

[@yakatdookith205]

This method is quite risky about damaging the board or the component.. Using hot air that long is definitely not recommended

[@ultrasoundguy1]

I have to wonder if the central pad is sometimes not soldered after repair, notably since the pad is a heat sink. When the QFN package first came out I had an awful 2 hour experience with a tiny leadless 8-pin (9 with the pad) QFN where I found I could either have that pad not be soldered properly due to too little duration of the hot air, or I'd get the soldering correct with a longer duration but then the chip was destroyed. So I sent it out to an assembly house who mounted and supposedly checked it with an X-ray, but on return I found one pin not connected. Fortunately I was able to touch it up, but what a hassle. The manufacturers prefer these leadless packages since there are no leads to break off in their test fixtures, but they really need to come up with a better option. I always avoid designing these parts in when possible, but often they give you no choice.

[@mohandmohand2047]

My broblume is marvel ic chip 88EC060-NNB2 and when i soldring it by use heat gun it self pin not conect good on motherbord i try by soldring iron sq-001 soldering... It so hard to do this job .. My misteaks is what is it more iron in midel or what plz help.

[@waferlayout]

Good Sir 😊 It looks so hard😅

[@mxsniper223]

thank's a lot man

[@mehdizaaker6105]

nice video! 73!

[@leso204]

Heat from underneath' ............

[@Davpana]

I' sorry to say this, but some passes of your video seems not useful to me, there might to be a quicker procedure..

[@dilannaniyals5468]

I don't recommend your procedure, waisting lot of time and no need to do lot of thing's

[@MitchCairns]

OK

[@helenliu-tt6ti]

@@MitchCairns I think u are doing well. I can learn somthing from different perspectives?