Search results

SMC BC ACOK is too low I believe. Check your soldering on U7000 and replace it again.... I seem to get some dud ISLs every now and then.

Make sure you have a connection between pin 1 of u6900 and pin 4 of u6901. Also, What is SYSONEWIRE and SMC BC ACOK VCC measuring? Also see if you have ADAPTER SENSE.

Replace the connector. Since you already replaced the LP8550 I assumed you made sure bkl en was present and checked that everything in the area was ok right? Like the caps and resistors in the area

Issues like this are usually caused by an issue between the power button and the board.... So the keyboard, trackpad (Probably not since you replaced it) and the trackpad cable. With everything plugged in and with the board in the chassis short your power pins (R5116/R5115) and see if it turns...

So you ran a wire to a burned LVDS connector without replacing it?

Dying HD4000s? Please no...

Lol.... Got to have those new and improved knee slappin GPUs

Sorry about that Bohmmen !

The cap is polarized. Make sure you put it on the right way...

Well there you go... L2 sells trash. Avoid them like the plaque... By from Louis or a place called Beetstech. I still get a bad one from the reel every now and then.

Does the board power up when you have the connector plugged in and short the power pins?

Specifically, Check these guys

To me this sounds like some kind of a sensor issue. Almost sounds like PROCHOT is being asserted. There are several resistors around the SMC that have thermal sensor signals going through them. You need to check them. PROCHOT is asserted by Q5159, U7200 and the SMC. Have a look at those...

Then there you go!

It's probably the ISL then.. Seems to be one of the more common chips to fail randomly.

U7100... Also, Does this have liquid damage? I get stuff all the time in my shop that has no liquid and the ISL is bad.

dukefawks Isn't it true that If the 51980 fails it can screw up the 3.3v and 5v FETS?

Sorry SMMRepair Was half asleep and didn't drink any coffee yet when I made that comment. It is very possible that those fets are bad.. However, Something killed them. Bad controller most likely and the controller most likely took out all the fets in that circuit as well. Replace the TPS51980...

Vcore present?

2936 is the same fan circuit as Bohmmen suggested.