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aprendiz 0 v Should that be present always? What causes that circuit to die? There was no water damage, r7510 measures correctly.

Changed out a non water damaged U7400 ona 3115causing 1/4 fan spin. Fan now spins at full speed (at least its a step in the right direction). Problem is that it runs at full speed, and I now have no backlight/display. no obvious damage to the board, all looks well around LED driver. Is the...

Not sure about the damage that was caused, this was sent to me asking if I can "just change out the SMC"

Just had a retina going fine. Determined it needed a new battery. Put one in, and the mag safe light goes off. I suspect it's blown the mag safe? I changed MagSafes, ran the board sans battery, works fine. Plugged in battery, plugged in MagSafe, light was green for a moment, then dead. (Board...

Does anyone know what this error means? Is it a sensor? And if so, what does it even look like? When I think of a sensor, I think of something that doesn't look like the others. Where would it even be? fans don't run fast btw. Unknown history, my customer, got from his customer who attempted to...

Definitely known good LCD. do you know what known good LED BKLT voltage drop should be on diode mode? If it's high what does that mean? Too high resistance somewhere correct?

dukefawks any other ideas? CPU?

@dukefawks... No corrosion, but I think I will switch it out anyway... does the SMC PID trip too if the Ts0P trips?

@dukefawks... No corrosion, but I think I will switch it out anyway... does the SMC PID trip too if the Ts0P trips?

I have an 820-2796 with no liquid, no drop damage. Runs sluggish and Throws Ts0P error ( I know usually track pad sensor). The SMC PID doesn't ring a bell... Anyone have any idea what it is and where I should start? Fan runs high, and machine is sluggish.

dukefawks larossmann smc_lid is 3.40 out of machine, no 5v pulse, no en signal at r8319. Went up the circuitry, all resistors within spec. Could it be the cpu?

yes, yes, 0V at L8300... Tried working up the circuit. Led me to U8300, where its getting VCC but no outputs. Replaced... Nothing yet. Checked for short, .401 voltage drop.

My bad. Minor liquid damage, seemed to be concentrated around the battery connector, and the keyboard backlight connector. The components near the kb bl connector were fried, so I replaced them and it seemed to work. I put the board aside to begin on another, came back and it didn't work...

I have another 3476 Retina, had display and backlight... suddenly stopped. No voltage at connector (Bcklt or display). Does anyone have any tips? I also would like if anyone has known good, voltage drop values for pins. TIA

P1 .46 P2 .70 P3 .71 P4 .448 P5 .71 P6 0 P7 .698 P8 .698 P9 .698 P10 .697 P11 .697 P12 0 P13 .698 P14 .697 P15 .697 P16 .697 P17 .671 P18 .697 Pretty much matches known good. Could the U4801 chip be bad? dukefawks

All voltages are the same and behave the same. The clk pins build and release, build and release on both.

larossmann dukefawks could not having new track pad in its spot on the palm rest make a difference? I tested a known good board at the connector right next to the subject at hand, and everything was identical at the connector.

dukefawks, thanks for removing the original post. It was indeed the cable for the screen. My first hint should've been the semi-melted wifi/camera/lvds cable, plastic cover. I am getting voltage on those two pins, wouldn't that indicate continuity? Any idea what could cause the higher voltage...

I was hoping you wouldn't say that. dukefawks larossmann any suggestions?

Was just typing. No corrosion, good 1k resistance. aprendiz