Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Can the same be done during repair work?

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Visually looks ok but does not hurt to perform a quick test across each pair of pads as a confirmation.

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Visually looks ok but does not hurt to perform a quick test across each pair of pads as a confirmation.

I checked, everything is beeping. replaced U8600. did not help. everything remains the same

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Visually looks ok but does not hurt to perform a quick test across each pair of pads as a confirmation.

Do you think it's worth resoldering the SSD chip?

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

No. For now leave the ssd alone.

Earlier wanted to link this video by Paul:

https://youtu.be/WbuRSUitwCw?si=Qa3GSW2fGYU-mQfm

Give it a review.

[reformatt]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Could be a dead SSD controller. The whole area is underfilled and a complete PITA to rework.

If you are going down that route, you might want to consider the iBoff SSD upgrade kits for T1 systems. I just did one on an A1707 and it works great. Only downside is you need a 2230 or 2242 sized NVMe SSD, and it must be single sided. You get the list of SSD's he has tested as working once you purchase the kit (doesn't want to make it public as the prices of those drives would naturally go up).

Main thing this board needs are the PCIe lanes to the PCH, reset line and 3.3V.

https://www.tindie.com/products/ibof...for-a1706-mbp/

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Could be a dead SSD controller. The whole area is underfilled and a complete PITA to rework.

If you are going down that route, you might want to consider the iBoff SSD upgrade kits for T1 systems. I just did one on an A1707 and it works great. Only downside is you need a 2230 or 2242 sized NVMe SSD, and it must be single sided. You get the list of SSD's he has tested as working once you purchase the kit (doesn't want to make it public as the prices of those drives would naturally go up).

Main thing this board needs are the PCIe lanes to the PCH, reset line and 3.3V.

https://www.tindie.com/products/ibof...for-a1706-mbp/

this is a good idea but I'm a newbie and it's still early)))
ssd controller do you mean U8600? I replaced it. or did you mean something else? Around the U8600 and SSD chips, all voltages fluctuate and are normal.

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

No. For now leave the ssd alone.

Earlier wanted to link this video by Paul:

https://youtu.be/WbuRSUitwCw?si=Qa3GSW2fGYU-mQfm

Give it a review.

what Paul says in the video, I checked the first one (PICCOLO_IUVD =1.8m as expected). I have P2V7NAND=2.7v. here something else is preventing the initialization from going through.

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

I changed the U9300 again and the result was zero.

[reformatt]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

this is a good idea but I'm a newbie and it's still early)))
ssd controller do you mean U8600? I replaced it. or did you mean something else? Around the U8600 and SSD chips, all voltages fluctuate and are normal.

Yes. On the boards I have here, these are underfilled and are double decker with RAM on top. The one I took off the A1707 was underfilled between the RAM and controller too. So depending on where you got the replacement, you may need to reball the RAM layer.

The one I put the kit on, I got it off eBay as MDM locked, and the seller destroys this section by using a knife on the NAND's and controller. The beauty of this kit is that you don't need to worry too much about ripping pads or sourcing new chips. The only pads you need to worry about are the PCIe lanes to the PCH and they aren't even under any of the chips.

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Could be a dead SSD controller. The whole area is underfilled and a complete PITA to rework.

If you are going down that route, you might want to consider the iBoff SSD upgrade kits for T1 systems. I just did one on an A1707 and it works great. Only downside is you need a 2230 or 2242 sized NVMe SSD, and it must be single sided. You get the list of SSD's he has tested as working once you purchase the kit (doesn't want to make it public as the prices of those drives would naturally go up).

Main thing this board needs are the PCIe lanes to the PCH, reset line and 3.3V.

https://www.tindie.com/products/ibof...for-a1706-mbp/

https://iboffrcc.com/pages/-guide-so...#1084;п:

By the way, there are step-by-step instructions, but I would still like not a simple solution, but to figure out why these components do not work, what is wrong and I will be grateful for ideas on troubleshooting

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

so let's continue the execution.
after the last measurements, I don’t know whether this is normal or not, but I have PP0V9_SSD_REG = 0.9V on the signal, but the resistance seems too high to me 330 ohms. 0.132V in diode mode.

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

If PP0V9_SSD_REG @ 0v9 is stable then the resistance on this rail is fine. Keep in mind that low voltage rails are often with a low resistance so 330 ohms is ok.

For example, CPU & GPU power rails will often be under 100 ohms to ground for their resistance.

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

If PP0V9_SSD_REG @ 0v9 is stable then the resistance on this rail is fine. Keep in mind that low voltage rails are often with a low resistance so 330 ohms is ok.

For example, CPU & GPU power rails will often be under 100 ohms to ground for their resistance.

Well then I'm confused. what else could be preventing the SSD from initializing?

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

What is the voltage to ground for the following?

PCIE_SSD_D2R_P
PCIE_SSD_D2R_N

Remove all power. Then check the above lines in DIODE mode.

Red meter probe to GROUND - yes ground.

Black meter probe to PCIE_SSD_D2R_P. What is the voltage ?

Then repeat with PCIE_SSD_D2R_N.

Checking to see if these lines are shorted or not.

I am assuming that the PCIe SSD is a high speed model so it will demand that both the Pair #0 and Pair #1 lines will be active to kick up the transfer speed.

x1 = PCIe slowest interface
x2 (SSD) = faster
x4 = faster than above
x16 = faster than above

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

What is the voltage to ground for the following?

PCIE_SSD_D2R_P
PCIE_SSD_D2R_N

Remove all power. Then check the above lines in DIODE mode.

Red meter probe to GROUND - yes ground.

Black meter probe to PCIE_SSD_D2R_P. What is the voltage ?

Then repeat with PCIE_SSD_D2R_N.

Checking to see if these lines are shorted or not.

I am assuming that the PCIe SSD is a high speed model so it will demand that both the Pair #0 and Pair #1 lines will be active to kick up the transfer speed.

x1 = PCIe slowest interface
x2 (SSD) = faster
x4 = faster than above
x16 = faster than above

PCIE_SSD_D2R_P=0.388V
PCIE_SSD_D2R_N=0.389V
no short circuit

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

In dc meter voltage mode, do you see a voltage to ground on these lines?

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

In dc meter voltage mode, do you see a voltage to ground on these lines?

When the power is connected, both lines are equal to 0V.
without connecting to the power supply, the power is 0.019V on both lines.

[mon2]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Confused. With no power, there should be no voltage.

Can you confirm that your meter is in DC volts mode? Select the lowest voltage scale since these pins should be under 3v3 for each. Then measure again.

Red probe on the pin to measure; black probe to ground. What is the voltage?

[PITERPENY]

Re: Macbook A1706. 820-00239-A doesn't see SSD questionmark folder

Confused. With no power, there should be no voltage.

Can you confirm that your meter is in DC volts mode? Select the lowest voltage scale since these pins should be under 3v3 for each. Then measure again.

Red probe on the pin to measure; black probe to ground. What is the voltage?

there is no voltage on these lines