How to desolder 29F400?

**niripas** · 15th February, 2012, 10:50 PM

I know it's a basic question, but a newbie has to start somewhere. I have two Magneti Marelli IAW 48P2.76. I need to get a 29F400 from one and put it to the other. I tried to desolder it with hot air, but to no avail - solder melts, but I cannot get the chip from the board. Could someone describe it for me how to remove it (and can I leave the bottom metal part of the case, or should I remove it as well to bare PCB)?

Thanks in advance!

**bazaa** · 15th February, 2012, 11:04 PM

try sliding a feeler gauge under the chip and using it as a lever ,their could be glue under your 29f400 if you dont want to use too much heat it might be worth using chip quik you can order afree sample enough to do few chips
Chip Quik: Easy removal of surface mounted devices
scroll to the bottom of page to get sample

**niripas** · 16th February, 2012, 01:22 AM

Yep, looks like it's glued. Do you know if the glue should let go during heating? Should I get the PCB off the lower case and put it on preheater, or just heating the top should do the job?

**Zmann** · 16th February, 2012, 03:21 AM

More than ten of Magneti Marelli IAW 48P2.xx I removing 29F400 have never found glue underneath, some Bosch does. Possibily your heat gun did not spread heat well enough to cover all. I have a preheater but seems not neccessary to this ECU.

Low melting point lead is useful too.