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CHASSIS LD21B
SERVICE MANUAL
READ THE SAFETY PRECAUTIONS IN THIS MANUAL
SPECIFICATION
CONTENTS
SAFETY PRECAUTIONS
SERVICING PRECAUTIONS
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS
Electrostatically Sensitive ES Devices
SERVICING PRECAUTIONS
Removal
IC Remove/Replacement
Replacement
Small-Signal Discrete Transistor Removal/Replacement
3. Test method
SPECIFICATION
4. Model General Specification
1. Application range
DVB-S QPSK 2 ~ 45Msymbol/s
Symbolrate 4.0Msymbols/s to 7.2Msymbols/s
symbolrate
DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s
5.1. Component Input Y, CB/PB, CR/PR
5. Video resolutions 2D
5.2. RGB Input PC - LS35/LS34/CS46 series models are not supported
PCDVI
5.3. HDMI InputPC/DTV
2. Designation
ADJUSTMENT INSTRUCTION
Boot file Download
1. Application Range
7. ADC Calibration
3.1. ADC Process
3.3. EDID data
3.2. EDID Download
4.1. Adjustment Preparation
4. Total Assembly line process
3.4 Function Check
6. Model name & Serial number D/L
4.3. Outgoing condition Configuration
6.1. Signal Table
5. HI-POT Test
GP4LOW
7. MAC Address & CI+ key download
6.3. Method & notice
7.1 MAC Address
7.3. LAN PORT INSPECTIONPING TEST
7.2 LAN Inspection
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SCREW ASSEMBLY WORKING GUIDE
Screw specification and application situation
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IC101
Rear
Side
LG2111 A
G301D
Applied Model **LM580T, **560T, **LS350T, **CS460T
LS350T/CS460T
TDSN
LS350S/CS460S
560S, **LS350S, **CS460S
G001D
EXPLODED VIEW
for SYSTEM EEPROM
GP4LS7LR22011.12.01
Copyright 2012 LG Electronics. Inc. All rights reserved
to delete CI or gate for
DDR3
Normal Power
VDDC
Normal
+1.5VDDR
FROM LIPS & POWER B/D
PowerDET
+3.3VNormal
IR/LED and control for normal models
USB1DIODES
USB SIDE
USB2DIODES
HDMI
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
RGB-PC / SPDIF
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION
COMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION
RS-232C
For Comsumer model, use 4PIN Wafer
LVDS for large inch
H5TQ1G63DFR-H9C
S7LR2DIVXMS10
GP4LS7LR22011/06/03 DDR25612
IC1201
SFLASHMAINMACRONIX
Serial Flash for SPI boot
SFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG
PHONE
Headphone *Option HEADPHONE
HEAD
Option name of this page CISLOT because of Hong Kong
CI Region
10067972-0500LF
GP4LS7LR22011/06/14 ETHERNET21
H/W option ETHERNET
ETHERNET
TDSQ-G001D
GP4RGLOBALTUNERBLOCK
TU2602TU2603 TDSS-G101D TDSN-G301D
TU2601
DCDCGND and AGND are connected
DVB-S2 LNB Part Allegro
OptionLNB
GP4LS7LR22011/11/02 DVBS27
PSC008-01
SCART / COMPONENT&COMPSIT
FULL SCART / COMPONENT1
JK2801
AUDIO AMPSTA380BWE
Page
Contents of LCD TV Standard Repair Process
Content
Contents of LCD TV Standard Repair Process Detail Technical Manual
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Error symptom
A2 Check Power Board 24v output
A. Video error
LCD TV
Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable
or 24V…
voltages of Power
Check various
Board 3.5V,12V,20V
Menu→ Set up→ Support → Signal Test Signal strength Normal over 50%
By using Digital signal level meter By using Diagnostics menu on OSD
Signal Quality Normal over 50%
→ Set-Top-Box, Different maker TV etc
Link Cable
A8/ A9
Check color by input -External Input COMPONENT -RGB
※ Check
Check color condition by input -External Input -Component RGB
External device screen error-Color error
Vertical/Horizontal bar, residual image, light spot
Connect other external device and cable
Measure voltage of each output of Power B/D
B. Power error
Check Power LED
Check Power On ‘”High”
POWEROFFCPUABNORMAL
Check Power Off Mode
If Power Off mode is not displayed Check Power B/D voltage
POWEROFFABNORMAL1
Check audio B+
C. Audio error
24V of Power
Check user menu Speaker off
Check audio B+ Voltage
In case of External Input signal error Check and fix external device
1. Remote controlR/C operating error
D. Function error
Check & Repair
Replace Main B/D
Check input signal
Y Check technical Signal information input? - Fix information
Recognition error
Identify nose type
E. Noise
F. Exterior defect