Beyond hardware, the LJ7 chassis manual includes a "Service Mode" entry sequence. Without the manual, you will never find it.
To enter Service Mode on most LJ7 chassis: lg lj7 chassis service manual
Once inside service mode (IN_STOP), you can: Beyond hardware, the LJ7 chassis manual includes a
Warning: Changing settings without the manual’s guidance can permanently brick your main board. Once inside service mode (IN_STOP), you can:
| Pin | Signal | Voltage (Standby) | Voltage (On) | | :--- | :--- | :--- | :--- | | 1-2 | GND | 0V | 0V | | 3 | 3.5V_STBY | 3.5V | 3.5V | | 4 | PWR_ON | 0V | 3.3V | | 5 | DRV_ON | 0V | 3.3V | | 6-8 | 12V_SW | 0V | 12V | | 9-11 | 20V_SW | 0V | 20V | | 12-13 | GND | 0V | 0V | | 14 | N.C. | - | - |
The LJ7 chassis utilizes a two-board architecture (Power Board + Main Board) with separate LED driver circuits integrated either on the Power Board or as a standalone unit depending on screen size.
Platform: LJ7 / LJ71 Applicable Models: Varies by region (Typically 43"-65" Class UHD/Smart TVs) Revision: 1.0 (Draft)