DOWNLOAD LG 42LC2DR (CHASSIS:LB61C) Service Manual ↓ Size: 7.49 MB | Pages: 30 in PDF or view online for FREE

Model
42LC2DR (CHASSIS:LB61C)
Pages
30
Size
7.49 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lc2dr-chassis-lb61c.pdf
Date
PREV: LG 42LC2D (CHASSIS:LD61C) Service Manual

LG 42LC2DR (CHASSIS:LB61C) Service Manual ▷ View online

- 17 -
1-2. 42” Power Board Structure
T801: Vs Trans
T901: Va Trans
T112: Low Voltage Trans
T501: ST-BY Trans
T601: PFC Inductor
- 18 -
2. In case of occurring strange screen into specific mode
2-1. In case the OSD does not displayed
(1) Symptom
1) LED is white.
2) Some discharge on Panel becomes accomplished continuously.
(2) Check follow
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Does the Thine IC
(IC900) Operates ?
Replace Thine
(IC900).
No
Is the Ctrl Board of
Module normal?
Replace Ctrl B/D.
No
No
Replace Scaler
(IC401).
No
Does the Scaler
(IC401) Operates ?
Replace VSC
Digital B/D.
Replace the cable.
Yes
Yes
Yes
- 19 -
2-2. In case of does’t display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode.
(RF, AV, Component, RGB, DVI)
(2) Check following
1) Check the all input mode should become normality display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become 
normality display from the PIP mode or DW mode.(Re-Check using Swap function) 
Check the NEC64015(IC701) if the main picture is abnormal, and
Check the NEC64015(IC801) If the sub picture is abnormal.
(3) When Analog TV mode is abnormal
(4) When AV mode is abnormal
Is the Splitter normal?
Is the Flat Cables
normal?
Replace Flat Cables.
Is the Tuner Cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Is the CXA2069Q(IC100)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC.
No
Yes
Is the uPD64015
normal?
Is normal the Input voltage, IIC
Communication and HV sync?
Is normal the Input voltage, IIC
Communication and HV sync?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC.
No
Is the CXA2069Q
normal?
Yes
Is the uPD64015
normal?
No
Replace the IC.
No
No
Replace the IC.
No
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Yes
- 20 -
(5) When Component or RGB-DTV/ PC mode is abnormal
(6) When HDMI/DVI mode is abnormal
(7) When DVI-PC mode is abnormal
(8) When Digital TV mode is abnormal
Is normal the Input voltage, IIC
Communication and HV sync?
Is normal the Input voltage, IIC
Communication and HV sync?
Is the CXA2151Q(IC500)
normal?
Yes
Is the MST3362(IC604)
normal?
Is the MST3362(IC604)
normal?
No
Replace the IC.
No
No
Replace the IC.
No
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Is normal the Input voltage, IIC
Communication and HV sync?
Is the EDID correct?
Yes
Is the latest version the Graphic card
driver of the PC?
Update the Graphic card driver with the
latest version.
No
No
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
Is the Scaler normal?
No
Replace the IC.
Cable connected well.
No
Is the Tuner Cable connected
well?
No
Is normal the Input voltage, IIC
Communication and output of the tuner?
Is the Splitter normal?
Yes
Replace the Tuner.
Is the Flat Cables
normal?
No
Is normal the Input voltage, IIC
Communication and HV sync?
Replace the IC.
No
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
Is the Scaler normal?
No
Replace the IC.
No
No
Replace the Tuner.
No
Yes
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