• Hardware: If recovery fails, replace the Main Board (SPI Flash memory failure).

    • The main board handles HDMI, USB, and tuner input. The manual details the pinouts for connectors like P201 or P204. Using a multimeter here helps diagnose audio amp failures or HDMI handshake issues.

    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:

    Once inside service mode (IN_STOP), you can:

    Warning: Changing settings without the manual’s guidance can permanently brick your main board.

    | Board Type | Common Part Number Prefix | Function | | :--- | :--- | :--- | | Main Board | EAX677... | Signal processing, OS (webOS), Audio/Video output, Wi-Fi. | | Power Board | EAX675... / EAY628... | AC/DC conversion, 12V/24V generation for Main & Backlight. | | T-CON Board | 6870L-... | Timing control for LCD panel (often integrated or logic-only). |