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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-S2 8PSK / QPSK 2 ~ 45Msymbol/s
Specification
Symbolrate 4.0Msymbols/s to 7.2Msymbols/s
symbolrate
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
Only for training and service purposes
IC101
Rear
Side
LG2111 A
LG2111 A
Applied Model **LM580T, **560T, **LS350T, **CS460T
Rear
Side
LG2111 A
560S, **LS350S, **CS460S
Rear
Side
EXPLODED VIEW
LGE Internal Use Only
Only for training and service purposes
GP4LS7LR22011.12.01
Copyright 2012 LG Electronics. Inc. All rights reserved
Normal
Normal Power
Only for training and service purposes
VDDC
+1.5VDDR
FROM LIPS & POWER B/D
PowerDET
+3.3VNormal
Copyright 2012 LG Electronics. Inc. All rights reserved
IR/LED and control for normal models
Only for training and service purposes
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC
Only for training and service purposes
USB SIDE
USB1DIODES
USB2DIODES
Copyright 2012 LG Electronics. Inc. All rights reserved
HDMI
Only for training and service purposes
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION
RGB-PC / SPDIF
Only for training and service purposes
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
Only for training and service purposes
RS-232C
COMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION
For Comsumer model, use 4PIN Wafer
Copyright 2012 LG Electronics. Inc. All rights reserved
LVDS for large inch
Only for training and service purposes
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC
Copyright 2012 LG Electronics. Inc. All rights reserved
Only for training and service purposes
S7LR2DIVXMS10
GP4LS7LR22011/06/03 DDR25612
LGE Internal Use Only
Serial Flash for SPI boot
Only for training and service purposes
Copyright 2012 LG Electronics. Inc. All rights reserved
LGE Internal Use Only
Headphone *Option HEADPHONE
Only for training and service purposes
Copyright 2012 LG Electronics. Inc. All rights reserved
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
CI Region
Option name of this page CISLOT because of Hong Kong
Only for training and service purposes
ETHERNET
H/W option ETHERNET
GP4LS7LR22011/06/14 ETHERNET21
Only for training and service purposes
TU2601
GP4RGLOBALTUNERBLOCK
Only for training and service purposes
TU2602TU2603 TDSS-G101D TDSN-G301D
Only for training and service purposes
DVB-S2 LNB Part Allegro
OptionLNB
GP4LS7LR22011/11/02 DVBS27
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SCART / COMPONENT&COMPSIT
FULL SCART / COMPONENT1
Only for training and service purposes
Copyright 2012 LG Electronics. Inc. All rights reserved
AUDIO AMPSTA380BWE
Only for training and service purposes
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC
Page
Contents of LCD TV Standard Repair Process
Content
Contents of LCD TV Standard Repair Process Detail Technical Manual
Continue to the next page
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
LCD TV
A. Video error
voltages of Power
Only for training and service purposes
Signal Quality Normal over 50%
A. Video error
By using Digital signal level meter By using Diagnostics menu on OSD
Menu→ Set up→ Support → Signal Test Signal strength Normal over 50%
LCD TV
A. Video error
→ Set-Top-Box, Different maker TV etc
Check color by input -External Input COMPONENT -RGB
A8/ A9
A. Video error
LCD TV
LCD TV
External device screen error-Color error
A. Video error
Vertical/Horizontal bar, residual image, light spot
Measure voltage of each output of Power B/D
B. Power error
Check Power LED
Check Power On ‘”High”
POWEROFFABNORMAL1
B. Power error
Check Power Off Mode
If Power Off mode is not displayed Check Power B/D voltage
Check user menu Speaker off
C. Audio error
24V of Power
LCD TV
Check audio B+ Voltage
C. Audio error
In case of External Input signal error Check and fix external device
LCD TV
Check & Repair
D. Function error
1. Remote controlR/C operating error
LCD TV
Recognition error
D. Function error
Check input signal
Y Check technical Signal information input? - Fix information
LCD TV
E. Noise
Identify nose type
LCD TV
F. Exterior defect