Datasheet CF-20F60K, CF-21K50E Service manual (LG)

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Y Safety Precautions

1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument.

2. Never disconnect leads while the TV receiver is on.

3. Don't short any portion of circuits while power is on.

4. The adjustment must be done by the correct appliances. But this is changeable in view of productivity.

5. Unless otherwise noted, set the line voltage to 230Vac

!10%, 50Hz.

Y Test Equipment required

1. RF signal generator (with pattern generator)

2. DC Power Supply

3. Multimeter (volt meter)

4. Oscilloscope

5. Color analyzer

RF AGC (Automatic Gain Control) Adjustment

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.

: Screen Voltage Adjustment

1) Tune the TV set to receive a digital pattern.

2) Press PSM (RED) button on remote controller. (standard picture)

3) Connect the probe of oscilloscope to the RK (Red Cathode) of CPT Board.

4) Adjust Screen Volume of FBT so that the waveform is the same as below figure.

: Focus Adjustment

NOTE: This adjustment should be performed after warming

up for 10 minutes.

1) Tune the TV set to receive an inactive channel station.

2) Adjust the Focus control of FBT for best overall focus.

Adjustment

1. Connect RF signal (60dB!1dB) and turn on the TV.

2. Press OK buttons on TV set and Remote Controller at the same time to get into SVC 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(Y) button to memorize the data.

Test Point : AGC TP (J2) Adjust : Remote Control

Test Point : RK (Red Cathode of CPT Board) Adjust : Screen Control of FBT

The waveform of RK(Red Cathode) of CPT Board

TUNER

AGC Voltage

6700VPF002A(ALPS)

3.5

0.1V

6700VPF003B(LGEC)

2.7 !0.1V

Test Point : Observing Display Adjust : Focus control of FBT

ADJUSTMENT

Horizontal FlyBack Time

Black level

140Vp-p

White level

GND for dc

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: Deflection Data Adjustment (Line SVC-1)

NOTE: To enter SVC mode, press "OK" buttons on both TV set

and the Remote control at the same time.

1. 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.

2. Deflection Adjustment Procedure

1) Vertical Adjustment

Slect VS and adjust until the mechanical center 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 center 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(Y) button to memorize the data.

3. Deflection Initial Setup Data

: Stereo Amp Adjustment(LINE SVC-2)

* Real Stereo Model ONLY

* INABLE HOTEL TV(LIMIT VOLUME)

: White Balance Adjustment.(LINE SVC-0)

NOTE : This adjustment should be performed after screen voltage

adjustment.

1) 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 Channel UP/DOWN button for desirous function adjustment.

4) Adjust VOL+ or VOL- button for GG031.

Adjust VOL+ or VOL-button in each status of "Rg--"/"Bg--" for X=281

8, Y=288!8 with color analyzer.

6) Press OK

(Y)

button to memorize the adjustment data.

: Hold Down check

Short J139 and ZD747 and check if the TV set turns into standby.

Status

Range

0~63

Initial Data

RemarkAdjustment

R-Drive

G-Drive

B-Drive

Status Default

21" LG

20" LG

14" LG

ORION 14"

ORION 16"

ORION 20"

ORION 21"

MAXVOL 1-100

Average ADJ. Data List

FM Prescaller

Nicam Prescaller

Scart Prescaller

Scart Volume

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: OPTION Adjustment (SVC MODE:OPTION-1,

OPTION-2)

NOTE: When the EEPROM has been replaced, the Option data

should be restored as the function of individual system and specification.

1) 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.

Table 1. OPTION 1 Function

Table 2. Specifications for OPTION-1 data

W/O RF 3.58(CF-, CZ-)

with

RF3.58(CT-, CD-)

Single SYSTEM(CA-)

South East Asian DUAL

with RGB Input

UBB for S-MAX(MONO)

MODEL

TOOL Option

AV2

UBB

EYE

SCART

SYSTEM

Option

OPTION Data SYSTEM SCART EYE UBB AV2

Code

Function Remark

BG+I+DK

BG+I+DK+M

ONLY

ONLY+DUAL

PHONO JACK (AV1)

SCART JACK (AV1)

W/O EYE

with EYE

W/O UBB

with UBB

W/O AV2 (Front)

with AV2 (Front)

OPTION Data SYSTEM SCART EYE UBB AV2

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Table 3. OPTION 2 Function

Table 4. Specifications for OPTION-2 data

: HOTEL TV Mode

NOTE: This mode is useful for HOTEL TV MODEL. Dealer or

HOTEL manager can use this option. HOTEL TV FUNCTION has two powerful function

1. AFTER SELECTING HOTEL MODE, CAN NOT CHANGE INITIAL SET UP CONDITION.

- CHANNEL PROGRAM(AUTO PROGRAM, MANUAL

PROGRAM, EDIT FUNCTION) and OSD LANGUAGE set up condition is fixed so the HOTEL lodger cannot change and remove initial set up data condition at his pleasure. This function prevents HOTEL lodger from needless changing channel memory data and OSD language condition. It will be helpful for maintainning the best suitable condition of TV SET

2. Limit MAX. VOLUME LEVEL.

- The HOTEL lodger can only use limited range of volume

level because loud TV sound can disturb other lodger's private business. The HOTEL manager select maximum volume level proper for HOTEL.

[ HOTEL mode operating guide

1. SET UP(CH.SEARCH AND EDIT) the Channel Program

2. SET UP Proper max volume level in SVC Mode.

3. SET UP HOTEL option in SVC Mode(OPTION-2).

Fast Filter IF-PLL

(for excessive RF signal)

Chinese Model only

Language varies by

MICOM Part No.

for Buyer 's request

POWER BALL

GAME

HOTEL

LANG.

CHINA

FFI

Option Code

Function Remark

Normal Condition

FFI Active

W/O Chinese NICAM

Chinese NICAM

Multi Language (M=0)

English Only (E=1)

W/O HOTEL

For HOTEL

W/O GAME

With GAME function

OPTION Data FFI CHINA LANG. HOTEL GAME

Datasheet CF-20F60K, CF-21K50E Service manual (LG)

Specifications and Main Features

Frequently Asked Questions

User Manual