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crwdns2936071:01crwdne2936071:0 — Remove U3101
Remove the chip cleanly, with hot air. On my Quick 861DE rework station, I use the settings 400 °C and 100L/min. For you to decide which settings you prefer, you can find the Quick 861DW on the shop.
crwdns2936071:02crwdne2936071:0 — Verification with the schematics
If we compare to the diagram on the PhoneBoard software;
crwdns2936071:03crwdne2936071:0 — Put a jumper
Take copper wire with a diameter of 0.02mm
crwdns2936071:04crwdne2936071:0 — Connect the remaining jumpers
The procedure is the same for F12, H12, J12. A12 and B12 are grounded and are not used for U3101 operation, so there is no need to jump them.
crwdns2936071:05crwdne2936071:0 — Reballing the U3101
Put on some flux.
crwdns2936071:06crwdne2936071:0 — Check the balls
Extract the chip by pushing with a thin tweezers.
crwdns2936071:07crwdne2936071:0 — Replace the chip
And finally we put the chip back.Flow, position and solder with hot air.
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