LG 42LB1DRA Support Question
LG 42LB1DRA Support Question
Find answers below for this question about LG 42LB1DRA - 42" LCD Integrated HDTV.Need a LG 42LB1DRA manual? We have 1 online manual for this item!
Question posted by robbinst2510 on January 3rd, 2016
I Have No Picture Or Sound
i just received a 42 lg tv and all of a sudden i have no picture or sound. What should i do
Current Answers
Related LG 42LB1DRA Manual Pages
Service Manual - Page 1
website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html
LCD TV SERVICE MANUAL
CHASSIS : LA61A
MODEL : 42LB1DR-UA / 42LB1DRA-UA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Service Manual - Page 4
...receiver ground lead to the contacts with a suitable high voltage probe. Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can generate electrical charges sufficient to the chassis or circuit, and observe all solid-state device heat sinks are integrated...the AC power
source before connecting the test receiver positive lead. Minimize bodily motions when handling...
Service Manual - Page 6
Receivable Broadcasting System
3. Market 6. Picture Size 7. RF Input Channel
4. Input Voltage 5. Operating Environment
9. Storage Environment
10. SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1.General Specification(TV...: -20 ~ 50 deg 4) Humidity : 10~90 % LCD Module
Remark
(ZE/TE) EU/Non-EU (PAL Market)
6),7) South America Market ...
Service Manual - Page 7
...
Item
1 Panel
2 Frequency range
3 Control Function
4 Component Jack
D4 Jack(525i, 525p, 750p,1125i)
5 Power ON Stand by DPMS Mode Power off
6 LCD Module
Specification
Remark
42" TFT WXGA LCD
H : 31 ~ 61Khz
PC Input
V : 56 ~ 75Hz
1) Contrast/Brightness
2) H-Position / V-Position
3) Tracking : Clock / Phase
4) Auto Configure
5) Reset
1 : Y
Middle east / NTSC Area
3 : Pb
5 : Pr...
Service Manual - Page 8
...17 31.5 40.00 49.5 57.283 65.00 75.00 78.75 79.50 84.75 84.75
-8- 3.Optical Feature(LCD Module)
No. Typ. Typ.
Typ. Typ.
-0.03
Typ. Typ 176, 176
500
400 1000 0.285 0.293 0.640 ... ME
SDTV, DVD 625 Line ZE, TE, ME
HDTV 576p
TE, ME
HDTV 720p
TE, ME
HDTV 720p
TE, ME
HDTV 1080i 50Hz (AU Ver.) TE, ME
HDTV 1080i 60Hz (ATSC) TE, ME
HDTV 1080i 59.94Hz TE, ME
5.
Proposed
VESA VESA ...
Service Manual - Page 9
... 59.94 50.00 59.94
Pixel clock(MHz) SDTV 576p 50Hz SDTV 480p 60Hz HDTV 720p 50Hz HDTV 720p 60Hz HDTV 1080i 50Hz HDTV 1080i 60Hz
HDCP HDCP HDCP HDCP
Proposed
7. HDMI PC INPUT Mode Table
No
Resolution
1....00 59.94
Pixel clock(MHz) SDTV 576p 50Hz SDTV 480p 60Hz HDTV 720p 50Hz HDTV 720p 60Hz HDTV 1080i 50Hz HDTV 1080i 60Hz
HDCP HDCP HDCP HDCP
Proposed
9. Mechanical specification
No, 1 ...
Service Manual - Page 14
...Va, Vs Voltage Adjustment)
8-1.
Not OK(Unlock) Not OK(20dB under)
Black Screen (No Picture)
Each PCB Assy must be checked by pressing the Adjust key on
the Service Remote Control (S...Card is inserted in DOS mode)
8.
GND
Va
GND 5V
P805
P804
VR 95
Vs AD
Va AD
VR90
PDP TV SET (or Digital Board)
CN1
P800
1 P803
P802
1
1
Connection Diagram of Device
1) Set devices as below...
Service Manual - Page 16
...right key (G ).
(3) When enter the adjustment mode, displayed the TV 2CH SPLIT Screen automatic at least 30 minutes by the following sequence.
(1) HEAT RUN at picture and appear as below figure.
(4) When the automatic adjustment is over,... Bar), pressing the 'Rev' button and appear as below figure
(2) After receive signal, confirm the signal receiving. Adjust' by
pressing the ADJ KEY.
Service Manual - Page 17
... to closed caption broadcasting
8 TXT
To toggle on/off
2 POWER ON
To turn the TV on or off the teletext mode
9 TV/AV
To select an external input for the TV screen
10 TURBO SOUND To start turbo sound
11 TURBO PICTURE To start
mute
Adjust
AV(Enter into W/B adjustment mode)
the screen W/B
W/B adjustment (automatic):
adjustment...
Service Manual - Page 29
Is it 9V #42 of UPD64015(IC701)? FIG1
FIG1 FIG2
(TV/CATV mode does not display)
Is no rmal the su b of D/ W MODE? Digita l Output Y(10bit),C(10bit),H/V,FID
Is ...IC101)? Digita l Output Y(10bit),C(10bit),H/V,FID Check f ollo w 1-2. Is n ormal #56 o utput of FMS6400(IC702) ? Is it 9V #42 of UPD64015(IC701)?
• DCR DVR RF MODE
1. Is n ormal o utpu of CXA2069(IC101)?
Service Manual - Page 31
... (abo ve) - 31 -
• DCR COMP Component/RGB
1
Check Si gnal format
(sup port ed for mat?)
Check C XA2181(IC501) Power
2
Pins, Osc, Comp 1(#41,#42,#43),
Comp2(#1,#2,#17),
RGB(#33,#34,#35,#36,#37)
Check C XA2181(IC501) outputs
3
#23(Y_out), #22(Cb_o ut),
#21(Cr_out),#15(V),#16(H)
4
Check M C14053B(IC505...
Service Manual - Page 32
...nal sh ape is same (abo ve)
6 : _Check CY2309 (IC203) REF(#1), CLKA4(#15) _Sig nal sh ape is norm al & No Sound ?
- 32 -
• DCR DVR HDMI/DVI
Y
1
Sno w noi se (Whit e dot) ? Y Re-do wnloa d EDID... Y2309 (IC203) REF(#1), CLKA4(#15)
1 : _Check HDCP Error _Retr y po wer off and on (TV or STB/DVD...)
N
Check HDCP Power Pin (IC604), MST3361(IC603) IIC(#69,#70)
2
Vid eo is same (abo ve)
Service Manual - Page 39
...encrypted analog and digital content. (The DCR must not receive RF signal via a STB or accessory RF modulator.) This will eliminate basic TV circuitry as
a possible problem. 4. To eliminate the ... you feel the card click into a DCR TV( Host) to access diagnostic screens for a terrestrial antenna) and verifying good picture quality. Before installing the CableCARD, installers should ...
Service Manual - Page 42
• Common sound out
- 42 -
Service Manual - Page 43
- 43 -
• TV RF NO Sound
NT Tun er AT/NT Tuner
SIF SIF
Main Audi o Process or
(MSP4450K)
L/R
Buffer (MC33078)
I2S
ADC (CS5331A)
I2S
PWM Modulator (NSP2100A)
AMP (TAS5122)
Front Speaker Monitor Out
I2S
HD-2
SPDIF
System CPLD (EPM570T144)
SPDIF Out (Optical )
Service Manual - Page 45
- 45 -
• DTV NO Sound
AT/NT Tuner Main
(LGDT3703)
Main Audi o Process or
(MSP4450K)
PWM Modulator (NSP2100A)
AMP (TAS5122)
Front Speaker Monitor Out
I2S
MUX CPLD (EPM570F256)
TP
HD-2
SPDIF
System CPLD (EPM570)
SPDIF Out (Optical )
Service Manual - Page 46
- 46 -
• DTV NO Sound
1
Check An tenna Cable
2
Check AT/NT Tuner (TU1300)
#3,11(5V), #24(IF_N), #25(IF_P)
3
Check LG DT3703 (IC1305) in pu ts
#22(IF_P), #23(IF_N)
Check LG DT3703 (IC1305) outputs
4
#44,45,47,49,50,52,54,55(VSB_DATA),
#57(ERROR),
#59(VALID), #61(SOP), #62(CLK)
5
Check...
Service Manual - Page 47
I2S
HD-2
SPDIF
System CPLD (EPM570T144)
SPDIF Out (Optical )
• AV/Component/RGB NO Sound
RGB Audi o Compone nt 1 Compone nt 2
AV Front AV
AV Switch (CXA2069)
L/R L/R L/R L/R
Main Audi o Process or
(MSP4450K)
L/R
Buffer (MC33078)
I2S
ADC (CS5331A)
I2S
PWM Modulator (NSP2100A)
AMP (TAS5122)
Front Speaker Monitor Out
- 47 -
Service Manual - Page 49
HDMI
HD-2
SPDIF
MST3361 SPDIF CS8415A
System CPLD (EPM570T144)
SPDIF Out (Optical )
• HDMI NO Sound
Main Audi o Process or
(MSP4450K)
PWM Modulator (NSP2100A)
AMP (TAS5122)
Front Speaker Monitor Out
I2S
- 49 -
Service Manual - Page 51
...)
MUX CPLD (EPM570F256)
TP I2S TP
PVR SOC (LGDT1304P)
HD-2
SPDIF
System CPLD (EPM570T144)
Front Speaker Monitor Out
SPDIF Out (Optical )
• Record & Play No Sound
- 51 -
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