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1. Check the PWR_ON voltage of Power B/D and Main B/D connector

2. The normal power supply voltage from Main B/D to Power B/D is 3V or higher

3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D

4. The normal power supply from MAIN to POWER is 3V or higher

Note. 3 / 4

Note 3. How to measure PWR On

PWR_ON

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Only for training and service purposes.

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LG OLED48C3 Series Specifications

General

Screen Size	48 inches
Display Type	OLED
HDR	HDR10, Dolby Vision, HLG
Refresh Rate	120Hz
Smart TV Platform	webOS
HDMI Ports	4 (HDMI 2.1)
Audio	Dolby Atmos
Voice Assistant	Google Assistant, Amazon Alexa
Processor	α9 Gen6 AI Processor 4K
USB Ports	3
Ethernet	Yes
Speaker System	2.2 Channel
Resolution	3840 x 2160 (4K)
Bluetooth	5.0
Wi-Fi	Yes (802.11ac)
Weight	32.6 lbs (without stand)
Dimensions (W x H x D)	42.2 x 24.6 x 1.8 inches (without stand), 42.2 x 26 x 9.3 inches (with stand)