Main Board - LG 55LW5600 Troubleshooting Manual

MAIN BOARD SECTION
The Main board receives its operational B+ from the Power Supply via P502.
There are two LVDS cable feeds that are output to the T-CON (TFT Driver). These carry the duel 24 bit
LVDS Video and TruMotion Video equaling a 120Hz video signal. These signals have already been
prepared for the T-CON board. The Main board also includes the Frame Rate Converter for 3D, Tuner,
Audio and Audio/Video inputs and selection circuits.
Input Voltages from SMPS.
STAND-BY STAND BY
• STBY 3.5V (P502 pins 9~12)
The Main board also develops several B+ sources on the board.
STAND-BY VOLTAGES
• 3.3V_ST (Direct from SMPS through L503).
LVDS
• Panel_VCC (12V Not generated, but switched
by Q507 from the 12V arriving from the SMPS). b Q 0 f
TUNER TU2101 and VSB CIRCUIT
• 5V_TU (Made from 5V_Normal through L2101 / 4)
• 3.3V_TU (Made from 3.3V_Normal L2103).
• 1.26V TU IC2103 (Made from 3 3V TU) 1.26V_TU IC2103 (Made from 3.3V_TU).
AUDIO IC1702
• 3.3V_AU_AVDD (Made from 3.3V_Normal).
• 3.3V_DVDD (Made from 3.3V_Normal).
• 1.8V (Made from 3.3V_Normal).
• 24V (Direct from SMPS through L504).
h 12V i i f h SMPS)
RUN RUN
• 12V (P502 pins 17, 19 and 21).
• 24V (P502 pins 2~4).
GENERAL GENERAL
• 5V_Normal IC507 (Made from 12V In).
• 3.3V_Normal IC505 (Made from 12V In).
• 5V USB IC506 (Made from 12V In).
BCM IC101 Video Processor BCM IC101 Video Processor
• 3.3V_ST (Direct from SMPS through L503).
• 2.5V_BCM52230 (IC504)
• D1.5V_DDR (IC508 )
• 0.9V_CORE (IC501)
Frame Rate Converter (IC5201) FRC
• 1.26V_FRC (IC5401) 3.3V_FRC (IC5402),
1.5V_FRC (IC5403)
HDMI SELECTOR VOLTAGES (IC701)
• 3.3V_HDMI
(From 3.3V_Normal through L701)
July 201 1 LCD TV
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55LW56000