Inx - In518 Ic Pinout Diagram
The chip cannot drive enough current to the LEDs, resulting in a very dim display.
Check the output cathode of the boost circuit diode. It should reveal a clean 15V to 17V DC . A value sitting exactly at 12V indicates the IC switching oscillator is dead or in protection mode.
The might not be a household name, but it is a linchpin of modern display technology. Understanding its role as a DC-DC converter and its pinout functions empowers you to diagnose issues, design better power systems, and appreciate the complexity packed into a tiny 5mm square chip.
┌─────────────────────────────────────┐ │ 1 VIN VDD_Logic 28 │ │ 2 EN GND_Analog 27 │ │ 3 POK AVDD_OUT 26 │ │ 4 VREF_IN VGH_OUT 25 │ │ 5 FB_AVDD VGL_OUT 24 │ │ 6 FB_VCOM VCOM_OUT 23 │ │ 7 GND_PWR Gamma_Ref1 22 │ │ 8 SW_AVDD Gamma_Ref2 21 │ │ 9 LXD_VGH Gamma_Ref3 20 │ │10 LXD_VGL Gamma_Ref4 19 │ │11 CLK_IN Gamma_Ref5 18 │ │12 SD_IN Gamma_Ref6 17 │ │13 GND_Logic SDA (I2C) 16 │ │14 SCL (I2C) NC 15 │ └─────────────────────────────────────┘ Inx In518 Ic Pinout Diagram
Ensure the central thermal pad is securely bonded to the board ground trace; an unbonded center pad will cause the new replacement chip to quickly overheat and fail within hours of deployment.
Found within the source driver circuitry of large-screen TVs.
Disclaimer: Working with high-voltage circuits in TVs can be dangerous. Always unplug the device before inspecting. The chip cannot drive enough current to the
If the voltage jumps up to its targeted level (e.g., +27V) for a fraction of a second and then decays rapidly back down to zero, the INX IN518 is functional. It is entering Protection Mode because it detected an over-current spike downstream.
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Locate the charge-pump diode array near pin 14 to verify a negative voltage of approximately -6V DC . A value sitting exactly at 12V indicates the
Due to its high integration, it is often replaced as a single unit or the entire T-CON board is swapped. You can find detailed pinout documents and replacement guides on technical platforms like Scribd . Repair Tip 🛠️
Unlike older chips that have visible metal pins sticking out from the sides, a QFN package has small metallic pads on its underside. This design is incredibly space-efficient, allowing for high-density mounting. However, this form factor means that the circuit board must be designed with a thermal pad directly beneath the chip, as this pad is often crucial for grounding and dissipating the heat generated during voltage conversion.
The IN518 is known to be a common point of failure in LCD displays, often due to overheating or power surges. Its failure typically leads to a variety of image-related issues. Below is a structured troubleshooting guide based on aggregated community knowledge, which also includes critical safety precautions.
Found on panels like the Innolux V236BJ1-P01 and similar small-to-medium LED TV screens.
⚠️ : This pinout is a compilation from reverse-engineered schematics and repair guides. It should be used as a guide only. Official design documents should always be referred to if available.
