Search results

I didn't fiddle more with DCPS, rather, I replaced Q7010. I get orange light now, PPBUS_G3H is 12.56V. Computer doesn't start yet. Doesn't it start automatically? I guess I'm missing some more rails.

I checked continuity without the charger connected. I tried injecting 20V 2A on F7005 pin 2. It pulls 0.065mA. I don't have a fake charger at the moment. Does the original charger need to be connected while voltage is injected? I saw Louis do it once if I remember it correctly.

Diode mode: 3V42 - 0.281V PPBUS_G3H - 0.415V D7010 is not shorted. Measures one way 0.745V, other way is OL. Q7010 has 1.65V across all of it when charger connected. I feel like it could be shorted since C7012 beeps on continuity mode with D7105 on PPDCIN_G3H_ISOL.

3V42 - 90kOhms PPBUS_G3H - 450kOhms R7180/81 and R7185/86 all have correct values.

Okay, F7005 is back. Voltage jumps back and forth from 1.72V to 1.76V. Resistance on F7005 is 21.5kOhms.

Hello, PP20V_DCIN_FUSE is 3.1V, F7005 is removed. Looking at schematics, I should get 20V here. Tried got known DCIN board, no change. Am I missing something obvious?

I don’t see any other logic too.

So what would be my next step here please?

Measurements taken without the keyboard connected. I feel like I'll need to redo it with the keyboard connected, right? Diode Voltage 01 0.406 0.000 02 0.646 3.300 03 0.651 0.000 04 0.640 3.300 05 0.635 0.000 06 0.655 0.000 07 0.429 0.070 08 0.598 0.060 09 0.514 0.040 10 0.591 0.050 11 0.638...

I've also changed U5701 and J5713, no luck. I understand if one of those three keys are not working, meaning bad trace or something else, but all three of them not working, even after changing the three components mentioned. Plus, signals are present and I tested a good known keyboard.

I've changed U5750, no luck. Even reflowed the old one with flux in case it had some crap under it.

Even though it has correct values as well as when keys are pressed?

Correct. They both work and rest of the keyboard works.

I cannot do that and none of the keys work independently.

Yes, the keys pass through U5750 before reaching U5701. You mean PRAM reset? I did SMC by removing battery and power and holding power button for 10 seconds.

For example, when I press Option key, U5701 pin 56 goes high to 3.42V.

What should I be looking there exactly? PP3V3_S4 is 3.3V SMC_TPAD_RST_L is 3.45V PP3V42_G3H is 3.45V.

These three keys are not working. Keyboard connector looks good. PP3V42 is present. When keys are pressed, they go high to 3.42V. Any ideas?

Does anyone have any clue?

I'm pretty much stuck here. I've got another 820-3209 working. Maybe just go crazy and go through the whole board with measures? Or is there something that should turn on to tell it to give some sign of life?