CHASSIS LD21B
SERVICE MANUAL
READ THE SAFETY PRECAUTIONS IN THIS MANUAL
http//aic.lgservice.com
CONTENTS
SAFETY PRECAUTIONS
SERVICING PRECAUTIONS
SPECIFICATION
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
SERVICING PRECAUTIONS
Electrostatically Sensitive ES Devices
IC Remove/Replacement
Replacement
Small-Signal Discrete Transistor Removal/Replacement
Removal
SPECIFICATION
4. Model General Specification
1. Application range
3. Test method
Symbolrate 4.0Msymbols/s to 7.2Msymbols/s
symbolrate
DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s
DVB-S QPSK 2 ~ 45Msymbol/s
5.2. RGB Input PC
5. Video resolutions 2D
5.1. Component Input Y, CB/PB, CR/PR
5.3. HDMI InputPC/DTV
PCDVI
ADJUSTMENT INSTRUCTION
Boot file Download
1. Application Range
2. Designation
3.1. ADC Process
3.3. EDID data
3.2. EDID Download
7. ADC Calibration
3.4 Function Check
4. Total Assembly line process
4.1. Adjustment Preparation
4.3. Outgoing condition Configuration
6.1. Signal Table
5. HI-POT Test
6. Model name & Serial number D/L
7. MAC Address & CI+ key download
6.3. Method & notice
7.1 MAC Address
GP4LOW
7.2 LAN Inspection
7.3. LAN PORT INSPECTIONPING TEST
SCREW ASSEMBLY WORKING GUIDE
Screw specification and application situation
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BLOCK DIAGRAM
Rear
Side
LG2111 A
EXPLODED VIEW
GP4LS7LR22011.12.01
Copyright 2012 LG Electronics. Inc. All rights reserved
to delete CI or gate for
for SYSTEM EEPROM
Normal Power
VDDC
Normal
DDR3
FROM LIPS & POWER B/D
PowerDET
+3.3VNormal
+1.5VDDR
IR/LED and control for normal models
USB2DIODES
USB SIDE
USB1DIODES
HDMI
RGB-PC / SPDIF
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
For Comsumer model, use 4PIN Wafer
RS-232C
COMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION
LVDS for large inch
S7LR2DIVXMS10
GP4LS7LR22011/06/03 DDR25612
IC1201
H5TQ1G63DFR-H9C
SFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG
Serial Flash for SPI boot
SFLASHMAINMACRONIX
HEAD
Headphone *Option HEADPHONE
PHONE
10067972-0500LF
CI Region
Option name of this page CISLOT because of Hong Kong
ETHERNET
H/W option ETHERNET
GP4LS7LR22011/06/14 ETHERNET21
GP4RGLOBALTUNERBLOCK
TU2602TU2603 TDSS-G101D TDSN-G301D
TU2601
TDSQ-G001D
DVB-S2 LNB Part Allegro
OptionLNB
GP4LS7LR22011/11/02 DVBS27
DCDCGND and AGND are connected
SCART / COMPONENT&COMPSIT
FULL SCART / COMPONENT1
JK2801
PSC008-01
AUDIO AMPSTA380BWE
Page
Contents of LCD TV Standard Repair Process
Contents of LCD TV Standard Repair Process Detail Technical Manual
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Error symptom
Content
A. Video error
LCD TV
Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable
A2 Check Power Board 24v output
voltages of Power
Check various
Board 3.5V,12V,20V
or 24V…
Signal Quality Normal over 50%
By using Digital signal level meter By using Diagnostics menu on OSD
Menu→ Set up→ Support → Signal Test Signal strength Normal over 50%
→ Set-Top-Box, Different maker TV etc
A8/ A9
Check color by input -External Input COMPONENT -RGB
※ Check
Link Cable
External device screen error-Color error
Vertical/Horizontal bar, residual image, light spot
Connect other external device and cable
Check color condition by input -External Input -Component RGB
B. Power error
Check Power LED
Check Power On ‘”High”
Measure voltage of each output of Power B/D
Check Power Off Mode
If Power Off mode is not displayed Check Power B/D voltage
POWEROFFABNORMAL1
POWEROFFCPUABNORMAL
C. Audio error
24V of Power
Check user menu Speaker off
Check audio B+
In case of External Input signal error Check and fix external device
Check audio B+ Voltage
Check & Repair
D. Function error
1. Remote controlR/C operating error
Check input signal
Y Check technical Signal information input? - Fix information
Recognition error
Replace Main B/D
E. Noise
Identify nose type
F. Exterior defect