Lg Lj7 Chassis Service Manual

Probe the pin marked 3.5V or STBY on the PSU-to-Mainboard connector.

The PSU converts AC power to DC voltages needed by the main board and LED array.

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Before starting any repair, make sure to:

Avoid looking directly into the LEDs when the TV is on. Probe the pin marked 3

This is an incredibly common issue across the LJ7 platform. The TV powers on, the status light blinks correctly, and audio can be heard, but the screen remains pitch black.

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Inspect the ribbon cables between the main board and the T-CON. Reseat the connections to eliminate oxidation or misalignment.

The LJ7 chassis relies on a highly integrated, multi-board system that coordinates power distribution, video processing, and panel drive functions.