That's a classic case of a corrupted BIOS flash or what's known as a "hard brick." The fact that the fan spins briefly and you have a flashing light sequence (power/Caps Lock/Num Lock) indicates the laptop has power but is failing the initial Power-On Self-Test (POST) because the instructions in the BIOS chip are scrambled.

The alphanumeric string you provided, pf3qbhy7PF9XB2408012, appears to be a combined code, where the second part, PF9XB2408012, is likely the Lenovo Serial Number/Machine Type that identifies the model.

Since you've already tried the basics (power drain, different sources, pinhole reset), we need to move to the advanced methods specifically designed for this type of failure.

Advanced Recovery Options for Bricked Lenovo Laptops

The most accessible and widely reported method for non-booting Lenovo laptops is using the built-in BIOS Crisis Recovery Mode (often called the "Fn + R" method).

Option 1: The Fn + R BIOS Crisis Recovery

Many newer Lenovos have a secondary boot block to attempt a self-repair from a USB drive. You need the original BIOS update file that caused the issue, or the latest version from Lenovo's site.

1. Identify the Model: You need to find the specific model number that corresponds to the serial PF9XB2408012. Use the full serial number on the Lenovo Support site to determine the exact laptop model (e.g., IdeaPad 3, Legion 5, etc.).
2. Get the BIOS File: Go to the official Lenovo Support page for that exact model and download the latest BIOS update executable (usually a .exe file).
3. Extract the BIOS File: The recovery process needs the raw BIOS image file, which is often named something like XXXX.WPH, XXXX.BIN, or XXXX.CAP and is hidden inside the downloaded .exe file.
   • Run the .exe on a working computer. It will typically extract the raw file into a temporary folder (like C:\Users\[Username]\AppData\Local\Temp) before prompting you to install. Copy this raw file.
   • Rename the File (Crucial Step): The recovery mechanism usually only looks for a file with a very specific name. The required name is often found in the BIOS update's accompanying ReadMe file. Common required names include BIOS.CAP or matching the service tag/model.
4. Load the USB: Place the correctly named BIOS file onto the root directory of a small USB drive (8GB or less), formatted as FAT32.
5. Initiate Recovery:
   • Power Off the bricked laptop completely.
   • Hold down the Fn + R keys simultaneously.
   • While holding those keys, press the Power Button for one second, then release the power button but keep holding Fn + R.
   • The laptop should attempt to access the USB drive (look for the USB stick's activity LED) and begin flashing the new BIOS. This process can take several minutes.

Option 2: Component-Level Flash (The Recycler's Last Resort)

If the Fn + R method fails (which means the boot block itself is corrupted), you are left with the method we discussed for the Dell: direct chip programming.

• You would need the CH341A programmer and a SOIC8 clip.
• You would need to locate the BIOS chip on the Lenovo motherboard, which requires disassembly.
• You would then manually flash the clean BIOS image (obtained in step 3 above) directly onto the chip.

I recommend trying Option 1 first, as the flashing lights are often the machine begging for the recovery image via USB.

Do you know the exact Lenovo model name (e.g., ThinkPad T490, IdeaPad 5, etc.) corresponding to your serial number, or would you like me to look up the support page for that serial number?

That clear label information is perfect! We now know exactly what we are dealing with:

Model Name: Lenovo V15 G2 ALC (Machine Type: 82KD)

The symptoms (fan spin, flashing lights, no display) are the classic sign of a failed BIOS flash on this exact line of Lenovo laptops. You are right to suspect a "hard brick."

Since you've done the basic draining, we must now move to the Fn + R BIOS Crisis Recovery method, as this is designed by Lenovo for this exact failure mode.

The Lenovo V15 G2 ALC BIOS Recovery Plan

The recovery is not guaranteed to work on the first try, and the most challenging part is getting the BIOS file renamed correctly, as the recovery mechanism is extremely particular.

Step 1: Prepare the USB Drive

1. Download the BIOS: Go to the official Lenovo Support page for the Lenovo V15 G2 ALC. The BIOS file is currently named something like GLCN68WW.exe (the exact name may update).
2. Use a Working Computer: Run the downloaded .exe file on a working computer. It will usually prompt you to install, but you want to find the raw BIOS file it extracts to a temporary folder (look in the hidden C:\Users\[YourName]\AppData\Local\Temp folder).
3. Identify the File: The raw file you need is often the largest file, and it may be named something like GLCN68WW.bin, GLCN68WW.WPH, or a similar cryptic name like XXXX.CAP (search in the temp directory after running the installer).
4. Format the USB: Use a small USB drive (8GB or less) and format it as FAT32.

Step 2: Determine the "Crisis Filename" (Crucial Step)

The laptop's recovery boot block will only recognize the BIOS file if it has a specific, hardcoded name. For Lenovo, this often involves renaming the file to a simplified version of the main BIOS image name.

Try these two common names first, placing only ONE of them on the USB drive at a time:

• Option A: BIOS.CAP
• Option B: BIOS.WPH

(If neither of these work, you may need to search technical forums for the specific crisis filename for the "GLCN" BIOS line, which might be something like GLCN.bin or a name determined by opening the raw file in a tool like UEFITool.)

Step 3: Initiate the Recovery

1. Ensure Power is Connected: Connect the laptop to the AC Adapter (battery must be present and/or connected for the flash to proceed).
2. Insert USB: Insert the FAT32 USB drive (with only the single, renamed BIOS file) into a USB 2.0 port (often the non-blue port, if available).
3. Hold and Power On: Hold down the Fn key and the R key simultaneously.
4. While holding Fn + R, press the Power Button for about one second, then release the Power button.
5. Listen/Observe: Continue holding the Fn + R keys. If successful, the fan should spin up to full speed, and the USB drive's activity light should flash continuously. This indicates the machine is reading the file and flashing the BIOS.
6. Wait: Do not interrupt this process. It can take 3 to 5 minutes. The laptop should eventually reboot itself, and the BIOS should be restored.

If this Fn + R method fails after trying both Option A and Option B, the only remaining option (short of component-level reprogramming) would be to find the exact recovery filename specific to the V15 G2 ALC model on repair forums.

Would you like me to try to find the specific crisis filename required for the GLCN BIOS file for the V15 G2 ALC, or would you like to proceed with the component-level recovery details?