Main Board Section - LG 32LD350 Troubleshooting Manual

MAIN BOARD SECTION

MAIN BOARD SECTION
The Main board receives its operational B+ from the Power Supply via P402.
There is only one LVDS cable that feeds to a Panel Interface board. The LVDS cable feeds 10 bit
LVDS Video signals and 12V through the Panel Interface board to the Panel. These signals have not LVDS Video signals and 12V through the Panel Interface board to the Panel These signals have not
been prepared for the Panel's H and V boards. This is done in the panel itself.
The Main board also includes the Tuner, Audio and Audio/Video inputs and selection circuits.
Input Voltages from SMPS.
STAND BY STAND-BY
• STBY 3.5V (P402 pins 9~12)
The Main board also develops several B+ sources on the board.
STAND-BY VOLTAGES
• 3.3V_ST (Voltage direct from SMPS)
LVDS
• Panel_VCC (12V Not generated, but switched
from the 12V arriving from the SMPS). from the 12V arriving from the SMPS)
TUNER and VSB CIRCUIT
• 5V_TU (Made from 5V_Normal)
• 3.3V_TU (Made from 3.3V_Normal)
• 1.26V (Made from the 3.3V TU) 1.26V (Made from the 3.3V_TU)
• +1.2V_PVSB (Made from 3.3V_TU)
• +3.3V_PVSB (Made from 3.3V_TU)
WIRELESS VOLTAGES
• 24V (Switched from 24V from SMPS) 24V (Switched from 24V from SMPS)
RUN RUN
• 12V pins 13 and 14
• 24V pins 17, 19 and 21.
GENERAL
• 5V_Normal (From 12V from SMPS)
• 5V_EXT
• 5V USB (From 12V from SMPS)
AUDIO AUDIO
• 1.8V (Made from 3.3V_Normal)
• 24V (From Power Supply)
MStar IC100 Video Processors
• 1.2V, D1.5V, D1.8V_DDR,
1.26V_VDDP, 3.3V_VDDP,
+3.3V_AVDD_MPLL
•T-CON IC9001 •T-CON IC9001
• 3.3V_VCC, -5V_VGL, 27V_VGH,
16V_VDD and HVDD (7.8V)
November LCD TV 32LD350
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