Lg K41s Isp Pinout

After analyzing the motherboard and community repair data, the ISP points for the LG K41S are located on the top side of the mainboard, near the eMMC chip or the MediaTek CPU. The eMMC chip is typically a Samsung or Toshiba BGA package.

Below are the confirmed test points or resistor locations for the LG K41S:

| Signal | PCB Marking / Location | Point Reference | | :--- | :--- | :--- | | CLK | Small test point or resistor (RP) near CPU/eMMC. | TP503 or side of R602 | | CMD | Test point or resistor pad. | TP502 or side of R601 | | DAT0 | Dedicated test point. | TP501 or side of R600 | | GND | Any large copper area, shield, or negative battery terminal. | Shield frame or TP504 |

Visual Reference Description:

If you don’t own a commercial ISP programmer, you can use a Raspberry Pi 3B/4 with the mmc-utils and rkflashtool suite.

To program the eMMC, you need to identify four critical lines:

(Note: While DAT1, DAT2, DAT3, and VCC are sometimes available, most basic ISP repairs only require CMD, CLK, DAT0, and GND. Power is usually supplied by a regulated DC power supply or a charged battery connected to the phone's main VBAT pins.) lg k41s isp pinout

On the LG K41S (MediaTek MT6762), the ISP points are tiny test pads near the eMMC chip. Alex used a magnifier and found three key pads:

| Signal | Pad location (approx) | Wire color (example) | |--------|----------------------|----------------------| | CLK | Near pin 5 of eMMC | White | | CMD | Next to CLK | Green | | D0 | Third pad in row | Yellow | | GND | Any large copper area | Black |

He also found VCC (3.3V) on a separate test point—but did not connect it. The eMMC would be powered by the phone’s battery or a regulated external supply (3.0–3.3V). After analyzing the motherboard and community repair data,

⚠️ Crucial tip: Do not apply 3.3V from the programmer directly to the eMMC’s VCC if the battery is still connected — you risk damaging the PMIC. Alex removed the battery and powered the board via a bench supply at 3.3V, 0.5A, soldered to the VCC test point and GND.

Do not inject 1.8V or 3.3V into the VCC point unless your programmer isolates its own power rail. Instead, power the phone’s main board via the battery connector (using a DC power supply at 4.2V or a fully charged battery). The phone’s own PMIC (Power Management IC) will generate the clean 1.8V for the eMMC. Your programmer should only provide the CLK, CMD, D0 signals and ground.

Remove the LG K41s back cover, battery, and all flex cables. Unscrew the mid-frame. Locate the motherboard and clean the area around TP502, TP503, TP504 with isopropyl alcohol. These pads are tiny—about 0.5mm in diameter. (Note: While DAT1, DAT2, DAT3, and VCC are

Open your ISP software (e.g., Mediatek SP Flash Tool, Octoplus).

You should see the eMMC CID, CSD, and user area size. If you see EMERGENCY DL mode or no response, recheck your soldering.

  • Double-check for solder bridges (use multimeter in continuity mode).
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