Samsung Q LED TV QA55Q70RAKXXL Power Supply Board
Description
Detailed Overview
Circuit Design: It is an LIPS (Lighting Inverter Power Supply) board, meaning it combines a standard Switch-Mode Power Supply (SMPS) with an integrated LED backlight driver circuit on a single PCB.
Output Rails: Provides primary DC voltages (typically 13\text{V} and direct logic lines) to the main processor board, alongside a high-voltage boost circuit designed to supply the precise constant current required for the QLED's direct-array dimming zones.
Safety & Protections: Features built-in fusing, varistors for surge suppression, and automatic shut-off protection triggers if a short circuit occurs in the backlight strips or mainboard.
Replacement & Handling Notes
Handling Precaution: Residual high voltage can remain stored in the board's large filter capacitors even after the TV is unplugged. Always let the TV sit disconnected for 10–15 minutes before touching or removing the board.
Compatibility Check: When sourcing a replacement, look for the BN44-00977A stamp or sticker on the PCB. Matching the exact part number ensures the connector pinouts and backlight voltage outputs align properly with your specific 55-inch QLED panel layout.