Lenovo Ideadpad gaming 3 15ACH6 not powering on

[questore]

Can someone confirm that RSMRST should raise without a correct BIOS?

[questore]

More info:
RSMRST should raise if the following conditions are OK:

0. When BIOS & KBC -firmware 100% are working
1. When KBC power is present, his quartz working and KBC reading the Bios data (look data exchange on BIOS chip an oscilloscope)
2. When adapter sense = 3.3V
3. When LID_SW# = 3.3V

SO in my case the first problem was that I have forgot to check LID_SW pin. LID SW sensor is on another part of the laptop so it was not rising because i had to connect the Display cable for it to Rise to 3.3v.
Now LID_SW is good 3.3V but it is much harder to check the laptop, no matter 😀
Adapter ID is OK and power is passing through the second mosfet so EC is communicating with BQ chip so NR2 is also good.

32Khz quartz is OK so maybe checking the 40Mhz is also a possibility.

MY NEXT STEP is that I try to flash a good working BIOS because BIOS chip content was full empty. So I'll ask help on this forum 😁

[reformatt]

I've worked on the Intel version of this laptop (LA-L161P) so I'm assuming the failure mechanism is probably the same. Have you checked the DC jack for damage? Failure mechanism I've seen is collapse of the DC jack centre pins, shorting 19V to ADP_ID and destroying the EC in the process, as there is no protection for overvoltage on this line. Hopefully this is not the case, otherwise your new EC will also be dead.

The EC must be programmed and this can be extracted from the BIOS - it's 160kb on the Intel board, so I assume the AMD version is the same. Do you trust the seller has done this correctly, and for the AMD version of the board? Programming can be done onboard with SVOD3 etc, however it must be done via the JDBG1 connector as this design uses a separate controller for the keyboard instead of the EC.

Details here for the LA-L161P board

https://www.badcaps.net/forum/troubl...u6-ec-firmware

[questore]

I've worked on the Intel version of this laptop (LA-L161P) so I'm assuming the failure mechanism is probably the same. Have you checked the DC jack for damage? Failure mechanism I've seen is collapse of the DC jack centre pins, shorting 19V to ADP_ID and destroying the EC in the process, as there is no protection for overvoltage on this line. Hopefully this is not the case, otherwise your new EC will also be dead.

The EC must be programmed and this can be extracted from the BIOS - it's 160kb on the Intel board, so I assume the AMD version is the same. Do you trust the seller has done this correctly, and for the AMD version of the board? Programming can be done onboard with SVOD3 etc, however it must be done via the JDBG1 connector as this design uses a separate controller for the keyboard instead of the EC.

Details here for the LA-L161P board

https://www.badcaps.net/forum/troubl...u6-ec-firmware

Thanks for the advice, I'm familiar with Adapter ID pin problem.
ADP_ID = 1.8V (135W charger correct) this was the first thing I have checked when I got the laptop on my bench and ID pin had some corrosion on DC jack shorting it to 20V, (so many dead laptop comes with this fault.)
The root cause is not that it short 20V to ADP_ID but that the manufacturer makes it cheaper by removing the protection ICs from ADP_ID line and it goes straight to the EC on these versions.
I trust the EC seller, it is very highly rated and lots of positive reviews (tihs is my first purchase from this seller, the previous seller had to cancel the business)
Unfortunatelly i dont have SVOD3 programmer, - it costs a lot for me as I'm doing repairs for people that cannot afford repair shops (and I'm not begining to talk about the fact that in my country (Hungary) repair shops are taking your money and then not even to fix a simple bios me clean problem, usualy 3 shops out of 4 cant fix these simple things)

[reformatt]

So which rail was shorted? +3VLP or +3VALW? If this were me, I'd be wondering how the EC itself was shorted in the first place. An overvoltage on the +3VALW rail would do it, that makes everything else on the rail suspect, including the CPU. You haven't noted resistance measurements for the power rails.

Any idea of past history? Has anyone else worked on it? At face value, your symptoms come across as bad programming on the EC.

[questore]

So which rail was shorted? +3VLP or +3VALW? If this were me, I'd be wondering how the EC itself was shorted in the first place. An overvoltage on the +3VALW rail would do it, that makes everything else on the rail suspect, including the CPU. You haven't noted resistance measurements for the power rails.

Any idea of past history? Has anyone else worked on it? At face value, your symptoms come across as bad programming on the EC.

Nobody worked on it before me. The laptop died one morning durring boot. (ADP_ID pin on the board side was shorted to 20v in the charger pin)

[questore]

NO LUCK Tryed 5 different BIOS. No sign of life.
While doing that I have noticed that while laptop was only on battery 5ALW was coming on BUT 3.3ALW was not present.
Of course it could be a symptom that since battery is not even charging maybe it is just that the battery is dead.
Starting to suspect APU fault

[reformatt]

Nobody worked on it before me. The laptop died one morning durring boot. (ADP_ID pin on the board side was shorted to 20v in the charger pin)

So now you are telling us the charger port was indeed faulty at the outset. That detail should have been shared in your original post.

The BIOS isn't going to corrupt itself in this event. This is a standard fault on most Lenovo laptops with this design of ADP_ID directly into the EC. Replacing the port and EC resolves it. To me, this is either a bad replacement EC or incorrect EC programming.

[questore]

So now you are telling us the charger port was indeed faulty at the outset. That detail should have been shared in your original post.

The BIOS isn't going to corrupt itself in this event. This is a standard fault on most Lenovo laptops with this design of ADP_ID directly into the EC. Replacing the port and EC resolves it. To me, this is either a bad replacement EC or incorrect EC programming.

Thanks,
I'm think of buying an EC programmer...

[reformatt]

You have to weigh up the cost vs the time you can waste on a fault like this. Like when I first bought a thermal camera. Was a $700 outlay but since then it has paid for itself many times over for the time it has saved me. EC programmer is the same.

SVOD4 is 256 euro directly from their store and it comes with the breakout extension board and ribbon cables for most keyboard connectors. It also has the ability to do regular SPI25 programming, along with MEC, Nuvoton, ITE and a bunch of other things I haven't played with. I think it's worth the investment. They do have adaptors you can buy for programming ENE/ITE chips directly, both TQFP and BGA, if you find that you need them in future.

[questore]

You have to weigh up the cost vs the time you can waste on a fault like this. Like when I first bought a thermal camera. Was a $700 outlay but since then it has paid for itself many times over for the time it has saved me. EC programmer is the same.

SVOD4 is 256 euro directly from their store and it comes with the breakout extension board and ribbon cables for most keyboard connectors. It also has the ability to do regular SPI25 programming, along with MEC, Nuvoton, ITE and a bunch of other things I haven't played with. I think it's worth the investment. They do have adaptors you can buy for programming ENE/ITE chips directly, both TQFP and BGA, if you find that you need them in future.

Thanks I have ordered a vertyanov programmer. I Hope that EC is only programmed with bad firmware
Another problem I have to solve until it arrives is that As I see this board is communicates through JDBG1 port that is not exist
I need to buy a connector 50521-01241-P01 but i did not found any online yet.
And a 14pin cable for it

[reformatt]

Haven't used the Vertyanov so not familiar with it's breakout board. You don't need the connector if you solder wires directly from the breakout to the corresponding pads on the board (either the JDBG1 pins or the test pads on the flip side of the board). You just need to buzz them out with a meter for KSI4~KSI7 and KSO3 to the EC to identify each one. It will be similar to the LA-161P board I would think.

BTW, it won't work if you connect directly to JDBG1 as R9743 is not stuffed for the KSO3 data line.

[questore]

Haven't used the Vertyanov so not familiar with it's breakout board. You don't need the connector if you solder wires directly from the breakout to the corresponding pads on the board (either the JDBG1 pins or the test pads on the flip side of the board). You just need to buzz them out with a meter for KSI4~KSI7 and KSO3 to the EC to identify each one. It will be similar to the LA-161P board I would think.

BTW, it won't work if you connect directly to JDBG1 as R9743 is not stuffed for the KSO3 data line.

Thanks, i found a video online for another programmer to this board, maybe it will help.

[questore]

Here is the link for video maybe it will help others: https://youtu.be/tV2yhX2RhyE?si=g7REyluEQoaMtGRy

[questore]

After ordering a connector and reading the EC it turned out that the problem was indeed the firmware. I dont know what it was programmed for and why the seller has to lie about it.
After reprogramming the laptop turned on and works. Thanks for the help.