Parts/Service for 27WL55A

Parts/Service for 27WL55A

Brand: LG logo LG

Category: TV

Document Type: Parts/Service

Language: EN

Uploaded: Nov. 21, 2025, 7:06 p.m.

Warranty Information

None

This manual provides schematic diagrams and structure for the LG 27WL55A/E/R/T television. It details the connections and components across various boards, including the AV board, Signal board, PC-IN board, LED HP board, and Power board.

Key sections cover:

  • Schematic Diagram Structure: Lists all the main components and their corresponding page numbers.
  • Circuit Block Diagram: Provides a high-level overview of the signal flow and interconnections between major modules.
  • Board-specific Schematics: Detailed diagrams for each board (AV_JACK, TIF, AUDIO_OUT, REGULATOR, KEY, PC-IN_BOARD, LED_RMT_HP, TEXT_SW, CONNECTOR(POWER_BOARD), MAIN_POWER(POWER_BOARD), SUB_POWER(POWER_BOARD), AC-INPUT, SIGNAL (various sub-sections like ANALOG IN, D IN A, D IN B, HDMI, etc.), DDR I/F, DDR SDRAM, DDR TERMINATION, DCDC CONV., LVDS OUT, LVDS Power).

Important notes regarding component identification (resistors, capacitors) and safety precautions are also included.

Troubleshooting and error codes

NOTE Description
1. RESISTOR Resistance is shown in ohm [K = 1.000, M = 1.000.000]. All resistors are 1/6W and 5% tolerance carbon resistor, unless otherwise noted. Options include 1/2R (Metal or Metal oxide of 1/2 watt), 1RF (Fuse resistor of 1 watt), 1/2S (Carbon composition of 1/2 watt), 10W (Cement of 10 watt). Tolerances: K = ±10%, G = ±2%, F = ±1%.
2. CAPACITOR Unless otherwise noted in schematic, all capacitor values less than 1 are expressed in µF, and values more than 1 in pF. All capacitors are ceramic 50V, unless otherwise noted. Symbols are provided for Electolytic and Mylar capacitors.
3. The parts indicated with "△" have special characteristics, and should be replaced with identical parts only. Identical part replacement is critical for safety.
4. Voltages read with DIGITAL MULTI-METER from point indicated to chassis ground, using a color bar signal with all controls at normal, line voltage 220 volts. Standard voltage measurement procedure.
5. Waveforms are taken receiving color bar signal with enough sensitivity. Waveform measurement procedure.
6. Voltage reading shown are nominal values and may vary ±20% except H.V. Tolerance for voltage readings.
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