Main              
47LE850047LE8500
              OUTLINE
              47LE8500 LCD Direct View Display
Overview of Topics to be Discussed                
Section 1
Overview of Topics to be Discussed            
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              LG Contact InformationLG Contact Information
              LCD Direct View Overview
              Basic Troubleshooting Steps
July 2010   LCD TV 47LE8500            
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              WIRELESS SECTION (Wireless Media Box)
July 2010   LCD TV 47LE8500                
Wireless Media Box (Sold Separately)
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Basic  Specifications              
Key TV Features
              47LE8500 Logo Familiarization Page 1 of 4
              47LE8500 Logo Familiarization Page 2 of 4
              47LE8500 Logo Familiarization Page 3 of 4
              47LE8500
47LE8500 Logo Familiarization Page 4 of 4                
Logo Familiarization Page 4 of 4
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              TV Rear Input / Output JacksTV Rear Input / Output Jacks
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              Software Updates (New and Changed Functions) Continued
              USB Automatic Software Download Instructions
              Manual Software Download:
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              Service Menu: Downloading EDID Data Pg 2 of 2
              47LE8500 Product Dimensions
27                
July 2010       47LE8500     LCD-DV 
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              Removing the Back Cover 
              Circuit Board Layout
              47LE8500 Connector Identification Diagram
MAIN BOARD                
POWER SUPPLY
IR LED                
Speaker (Front Left)
              47LE8500 Connector Identification Diagram
(Main)                
TFT PANEL
Speaker (Front Right) Soft Touch Keys                
INVERTER
              Power Supply 
Power Supply  Board Removal                
Board Removal
              Removing the Main Board
Disconnect P7500,  P7501, P7900, P7901,  P8000, P8200 and P8800                
p/n EBU60842601
              Removing the Inverter (Main) Board
              Removing the Inverter (Secondary) Board
              Removing Front IR Board
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              Power Supply (SMPS) Board Layout
              47LE8500 Power Supply Start Up Sequence
POWER SUPPLY (SMPS)                
9
1                
4
              47LE8500 Power Supply Start Up Sequence
MAIN  BOARD                
2 5 66 8
July 2010       47LE8500     LCD-DV               
47LE8500 Television Turn On Commands Circuit Drawing
Q8002                
Q8005
SMPS P201                
MAIN Board P8000
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              Power Supply Board Backlights Test 2
              Power Supply Connector P201 Voltage and Diode Check
P201 Connector SMPS to Main P8000 P201 Connector                
Odd pins are on front row
              Power Supply Connector P204 / P205 Voltage and Diode Check
              Power Supply Connector SK101 Voltage and Diode Check
SK101                
F100
              Power Supply F101 and F501 Voltage Checks
              INVERTER (LED BACKLIGHTS) SECTION
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              47LE8500 (IOP) Cartridge Breakdown
51 July 2010       50PK750     Plasma               
47LE8500 IOP Block Structure Information
47LE8500 TFT PANEL                
LVDS To TFT Panel
Backlight Blocks 9 Bars (24 Blocks Ea.) 216 Blocks V1 through V216                
3 Extension Boards 9 Connectors Ea. 2 (13V) B+ pins Ea. 8 (V) Connections Ea. 216 (V) Connections
              47
Explode View of the IOP Panel              
47
Explode View of the IOP Panel              
47LE8500 Inverter Main Layout
CN5                
CN3 CN2 CN4
DO NOT  MEASURE                
CN1
              47LE8500 Inverter Secondary Layout
              47LE8500 Inverter (Main) B+ Routing
A B              
47LE8500 Inverter (Secondary) B+ Routing
C            
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July 2010       47LE8500     LCD-DV               
P-DIM (Global Dimming) Explained:  P-DIM (May also be called PWM-DIM, VBR-B, PDS, BCM-VBR-B)
59              
Inverter (Main) Fuse F1 and Inverter (Secondary) Fuse F101 Check
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              LED Drive Signal and Troubleshooting Information
              Inverter Board Connector CN3 to Extension (Left) (Voltages)
              Inverter (Main and Secondary) CN1 and CN101(Voltage and Diode Ch
Inverter (Main and Secondary) CN1 and CN101(Voltage and Diode Check)                
eck)
              Inverter (Main) CN11 & Inverter (Secondary) CN103 (Voltage and D
Inverter (Main) CN11 & Inverter (Secondary) CN103 (Voltage and Diode Check)                
CN11 Inverter Main to Main P7900
iode Check)                
Inverter Run voltages taken with built in test pattern
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              MAIN BOARD SECTION
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              47LE8500 Main Layout
MAIN BOARD p/n: EBU60842601                
QD
               47LE8500 Main (Front Side) Component Voltages
 71                
47LE8500 Main (Back Side) Layout
QD              
 47LE8500 Main (Back Side) Component Voltages
 73                
Main Board X9001 and X9000 Crystal Checks
              Main Board X8100 and X1001 Crystal Checks
              Main Board DC to DC Converter (Voltages for Panel) Checks
              Main Board Additional Panel Voltage Checks
              Main Board Connector P8000 to Power Supply Voltage and Diode Che
Main Board Connector P8000 to Power Supply Voltage and Diode Check                
ck
OSD Backlight setting and Intelligent Sensor (room light condition).  Range 0.37V to 3.3V.                
P8000 Odd Pins Front Row
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              Main Board P8200 to (Ft. IR/Intelligent Sensor) Voltage and Diod
Main Board P8200 to (Ft. IR/Intelligent Sensor) Voltage and Diode Check                
e Check
              Main P7900 / P7901 (Voltage and Diode Check)
P7900 Main to Inverter Main CN11                
Inverter Run voltages taken with built in test pattern
P7901 Main to Inverter Secondary CN103              
Main Board Connector P8800 to Speakers Voltage and Diode Check
IC8801                
P8800
(1)            
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              FRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTION
July 2010   LCD TV 47LE8500              
FRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTION
              Front IR Board (Connections Identified)
              Front Board Connectors CON1, CON2 and CON3 Voltage and  Diode Ch
Front Board Connectors CON1, CON2 and CON3 Voltage and  Diode Check                
eck
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P8800 P8200                
Q8701
V169~V176                
CN14
              Leandro Palmeira
              42LE8500 Inverter Main and Secondary Local Dimming Control Signals Waveforms
CN11 INVERTER (MAIN) FROM P7900 MAIN BOARD                
CN103 INVERTER (SECONDARY) FROM P7901 MAIN BOARD