plantguy123
New member
Hello. I have a 17" 2009 Macbook Pro (logic board 820-2610 I believe). For the past few years it was having trouble starting up and then it would shut off quickly. Occasionally it would boot completely and then it would work fine for days. A few months ago it stopped starting up completely. I read on a forum about how this could be due to the infamous C7771 capacitor. I followed the heat test and put it on the radiator. The computer then booted up, so I then got a few of this capacitor: 330 uf 1362J - d
https://www.mobilesentrix.ca/capaci...3-15-17-a1278-a1286-1297-c9560-330uf-2v-b2-sm
Initially I installed the capacitor after moving the 2R2 L7770 coil to make room for it. When I was removing the original tantalum capacitor I tried moving it before it was hot enough and partially detached the + lead pad on the logic board. I tried smoothing over the *partial* break with solder. The replacement cap measured got a 0.3 volt reading with the multimeter, which obviously wasn't good.
Trying again I wanted to make sure that the capacitor was properly attached to the partially damaged pad. I tried attaching another capacitor with wires and then I hooked the negative lead wire to a screw hole (just to try something new), but got the same 0.3 V reading.
If the new cap is measuring 0.3 V, then maybe that suggests that the original problem wasn't the capacitor, or that there are more problems? I didn't test the tantalum cap because I assumed that it had been the culprit based on the symptoms.
I read on another post that the L7770 2R2 coil should be returning a 1 V reading. I got a 0.1 V reading from it - could I have broken the coil with excessive heat from the hot air rework station? Here are the photos of the repair:
Anyone have any ideas as to what could've gone wrong? Thanks.
https://www.mobilesentrix.ca/capaci...3-15-17-a1278-a1286-1297-c9560-330uf-2v-b2-sm
Initially I installed the capacitor after moving the 2R2 L7770 coil to make room for it. When I was removing the original tantalum capacitor I tried moving it before it was hot enough and partially detached the + lead pad on the logic board. I tried smoothing over the *partial* break with solder. The replacement cap measured got a 0.3 volt reading with the multimeter, which obviously wasn't good.
Trying again I wanted to make sure that the capacitor was properly attached to the partially damaged pad. I tried attaching another capacitor with wires and then I hooked the negative lead wire to a screw hole (just to try something new), but got the same 0.3 V reading.
If the new cap is measuring 0.3 V, then maybe that suggests that the original problem wasn't the capacitor, or that there are more problems? I didn't test the tantalum cap because I assumed that it had been the culprit based on the symptoms.
I read on another post that the L7770 2R2 coil should be returning a 1 V reading. I got a 0.1 V reading from it - could I have broken the coil with excessive heat from the hot air rework station? Here are the photos of the repair:
Anyone have any ideas as to what could've gone wrong? Thanks.