LG-CB20T20X with TDA8841 OR TDA8842 AND LG WP32A30 with CXA1855S, CXA2050S – SERVICE MODE, OPTIONS ADJUSTMENT AND SCHEMATICS DIAGRAMSTo read a Lg Tv Schematic Wiring Diagram, you should know different symbols used, such as the main symbols, lines, and the various connections. The standard or fundamental elements used in a wiring diagram include power supply, ground, wire and connection, switches, output devices, logic gate, resistors, light, etc.
A Lg Tv Schematic Wiring Diagram usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device. This is unlike a schematic diagram, where the arrangement of the components interconnections on the diagram usually does not correspond to the components physical locations in the finished device. A pictorial would show more detail of the physical appearance, whereas a wiring diagram uses a more symbolic notation to emphasize interconnections over physical appearance.
Lg Tv Schematic Wiring Diagram is the least efficient diagram among the electrical wiring diagram. They are often photos attached with highly-detailed drawings or labels of the physical components. A pictorial doesn’t even make an effort to be shown clearly or effectively. A person with a strong knowledge of electrical wiring diagrams can only understand a pictorial.
RF AGC (Automatic Gain Control) Adjustment, Test Point - AGC TP (J05). Adjust - Remote Control
The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions. Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as;
1) Channel
interference in a CATV system.
2) Picture bending and/or color beats, which are unusually due to excessive RF
signal input when the receiver is too close to a transmitting tower or when the
receiver is connected to an antenna distribution system where the RF signal has
been amplified. In this case, the input signal should be attenuated (with pad
or filter) to a satisfactory level.
3) Picture noise caused by "broadcast noise" or weak signal. If the broadcast is "clean" and the
RF signal is at least 1mV (60dBu), the picture will be noise free in any area.
Adjusting
RF AGC to one end of rotation will usually cause a relatively poor signal to
noise ratio;
Adjusting to the other end of rotation will usually cause a degradation of over
load capabilities resulting in color beats or adjacent channel interference.
Adjustment
1. Connect
RF signal (65dB!0.2dB) and turn on the TV. [ Standard adjustment Channel]
- EU 05 Ch. (frf = 175.25MHz) : CK, CL, CB
- EU 41 Ch. (frf = 631.25MHz) : CI
2. Press OK buttons on TV set and Remote Controller at the same time to get
into SVC-0 mode.
3. Press Channel UP/DOWN button on the Remote Controller several times to find
AGC?
4. Press Volume UP/DOWN button until the AGC Voltage is the same as the Table
below.
5. Press OK button to memorize the data.
Service mode
To enter SVC mode, press "OK" buttons on both TV set and the Remote control at the same time.
Preparation for Deflection Adjustment
1)
At SVC mode, press the Yellow colored button.
If the Remote Controller doesn't have the Yellow button, you should use
a Service Remote Control (105-201G) and press SVC button.
And then, deflection data adjustment OSD (SVC1 mode) will be displayed.
2) Press Channel UP/DOWN button for desirous function
Adjustment.
3) Press Volume UP/DOWN button to adjust the data.
Vertical Adjustment
Select
VS and adjust until the mechanical centre of CPT and that of screen coincides
and select VA and adjust to coincide the inner circle of screen with outer
frame of CPT.
2) Horizontal Adjustment
Select
HS and adjust until the mechanical centre of CPT and that of screen coincides.
3) Vertical S Correction Adjustment
Select
SC and adjust until top-bottom side pincushion are equal.
4) Press OK button to memorize the data.
White Balance Adjustment.(LINE SVC-0)
[This adjustment should be performed after screen voltage adjustment.]
Tune the TV set to receive
an 100% white pattern.
2) Press OK(Y) buttons on TV set and remote controller at the same time to get
into SVC mode.
3) Press PSM(RED) button on remote controller. (Standard picture)
4) Press Channel UP/DOWN button for desirous function adjustment.
5) Adjust VOL+ or VOL- button for GG031.
6) Adjust VOL+ or VOL-button in each status of "Rg--" "Bg--"
for
X=293!8, Y=295!8 with color analyzer.
7) Press OK button to memorize the adjustment data.
OPTION Adjustment (SVC MODE: OPTION-1, OPTION-2)
[When the EEPROM has been replaced, the Option data should be restored as the function of individual system and specification.]
Press OK buttons on both
TV set and Remote Controller at the same time to get into SVC mode.
2) Press the Yellow button several times to find OPTION-1 or OPTION-2.
3) Input the correspond OPTION data referring to Table below with the numeric
buttons 0~9.
LG WP32A30 SCHEMATIC
