LG 25FB7RLE Service Manual

COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : CW62C
MODEL : 25FB7RLE
website:http://biz.LGservice.com
Oct, 2007
Printed in ChinaP/NO : MFL37794424
Internal Use Only
- 2 -
CONTENTS
Contents...................................................................................................................2
Safety Precautions..............................................................................................3
Control Descriptions..........................................................................................4
Specifications........................................................................................................7
Adjustment Instructions .................................................................................8
Trouble Shooting ................................................................................................16
Printed circuit board........................................................................................20
Block Diagram .....................................................................................................22
Exploded View....................................................................................................24
Exploded View Parts List .............................................................................25
Replacement Parts List .................................................................................26
SVC. Sheet..................................................................................................................
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
- 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.
It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accurate high impedance HV meter.
Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate
23.5 ± 1.5KV: 14-19 inch, 26 ± 1.5KV: 19-21 inch,
29.0 ± 1.5KV: 25-29 inch, 30.0 ± 1.5KV: 32 inch If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.
Leakage Current Hot Check circuit
The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued X-RAY RADIATION protection, the replacement tube must be the same type tube as specified in the Replacement Parts List.
IMPORTANT SAFETY NOTICE
0.15uF
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
To Instrument’s exposed METALLIC PARTS
AC Volt-meter
Good Earth Ground such as WATER PIPE, CONDUIT etc.
1.5 Kohm/10W
- 4 -
DESCRIPTION OF CONTROLS
All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set.
Remote control handset
Before you use the remote control handset, please install the bat­teries. See the next page.
1. POWER
switches the set on from standby or off to standby.
2. NUMBER BUTTONS
Switches the set on from standby or directly select a number.
3. MENU
selects a menu.
4.
D / E
(Programme Up/Down)
selects a programme or a menu item. switches the set on from standby. scans programmes automatically.
F / G
(Volume Up/Down)
adjusts the volume. adjusts menu settings.
OK
accepts your selection or displays the current mode.
5. TELETEXT BUTTONS (option)
These buttons are used for teletext. For further details, see the ‘Teletext’ section.
6.
SLEEP
sets the sleep timer.
7. PIP BUTTONS (option) PIP
switches the sub picture on or off.
PR +/-
selects a programme for the sub picture.
SWAP
alternates between main and sub picture.
INPUT
selects the input mode for the sub picture.
SIZE
adjusts the sub picture size.
STILL
freezes motion of the sub picture.
POSITION
relocates the sub picture in clockwise direction.
(With TELETEXT / PIP)
0
PR
PR
VOL
VOL
OK
UPDATE/ HOLD/
(With TELETEXT / Without PIP)
5
1 2 3 4
5
6
7
8
9
0
PR
PR
VOL
VOL
OK
1
2
3
4
6
5
7
12
8
11
14
13
9
10
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
- 5 -
8. FAVOURITE
selects a favorite programme.
9.
EYE/*(option)
switches the eye function on or off.
10. MUTE
switches the sound on or off.
11. TV/AV
selects TV or AV mode. switches the set on from standby. exits the Teletext mode.
12.
I/II/
*
selects the language during dual language broadcast. selects the sound output (option).
13. Q.VIEW (or YELLOW)
returns to the previously viewed programme.
14.
LIST (or BLUE)
displays the programme table.
*
: No function
COLOURED BUTTONS : These buttons are used for teletext (only
TELETEXT models) or programme edit.
(Without TELETEXT / PIP)
1 2 3 4
5
6
7
8
9
0
PR
PR
VOL
VOL
OK
(With PIP / Without TELETEXT)
7
Q.VIEW LIST
4
1
3
2
8
12
13
11
14
6
9
10
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
1 2 3 4 7
VOL
PR
PR
OK
6
9
5 8 0
VOL
- 6 -
1. MAIN POWER (ON/OFF)
switches the set on or off.
2. POWER/STANDBY INDICATOR
illuminates brightly when the set is in standby mode. dims when the set is switched on.
3. MENU
selects a menu.
4. OK
accepts your selection or displays the current mode.
FF / GG
(Volume Down/Up)
adjusts the volume. adjusts menu settings.
DD / EE
(Programme Up/Down)
selects a programme or a menu item. switches the set on from standby.
5. REMOTE CONTROL SENSOR
Note : Only use the supplied remote control handset. (When you use others, they will not be able to
function.)
6. AUDIO/VIDEO IN SOCKETS (AV IN3)
Connect the audio/video out sockets of external equipment to these sockets.
1 2 5 3 4
VIDEO L/MONO RAUDIO
AV IN3
6
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Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
SPECIFICATIONS
Note : Specification and others are subject to change without notice for improvement.
V Scope
This specification can be applied to all the television related to CW62C Chassis.
V Test and Inspection Method
1) Capability: It follows the TV QC Standard of LGE.
2) Standards of Etc. requirement
- Safety: IEC60065
-EMC : CE standard(EN55020,EN55013)
V Test Condition
Conduct the test as mentioned below.
2.1 Temperature : 25 ± 5°C ( CST 40±5°C)
2.2 Relative Humidity : 65
± 10%
2.3 Power Voltage :
2.4 Follow each drawing or spec for spec and performance of parts, based upon P/N of B.O.M.
2.5 Warm up TV set for more than 20min. before the measurement (If no problem in capability,this allow omitted)
No
1
2
3
4
5
6
7
Item
Receiving System
Receiving Channel
Input Voltage
Market
Picture inch Tuning System
Operating Environment
Storage Environment
Remark Korea,Japan,Taiwan,North America,Middle South American EU /Non EU MODEL
OPTION
Korea,Taiwan,North America. Middle south American
Japan
1)EU/Non EU Model
2)NTSC-M (Multi-model NTSC-M)
Korea Middle south America North America Japan Taiwan NON-EU EU
NTSC MODEL
PAL MODEL 200 PR(W/O TXT )
Specification
1) NTSC M
2) NTSC M/ PAL M/N
1) PAL,SECAM BG
2) PAL/SECAM DK
3) PAL-I/I
4) NTSC M
5) NTSC 4.43(AV)
6) SECAM L/L
7) NTSC M/PAL M/N
1) VHF : 02~13 UHF : 14~69 CATV : 02~125
2) VHF/UHF : 1~62CH
CATV : C13~C38CH TOTAL 88CH
3) VHF : E2 ~ E12
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21 ~ S41
4) VHF : 02 ~ 13 UHF : 14 ~69 CATV : 02 ~ 71
AC 220V, 60Hz AC 100 ~ 240V, 50/60Hz AC 120V, 60Hz AC 100V, 50/60Hz AC 110V, 60Hz AC 110 ~ 240 V/50Hz, 60Hz AC 230 V 50/60 Hz Korea, Japan, Taiwan, North America. Middle South American ,Filipine, China, Middle Asia, Asia, EU, CIS FLAT 29” FS FVS 100 program
1)Temp : 0 ~ 45 deg
2)Humidity : under 85 %
1)Temp : -20 ~ 60 deg
2)Humidity : under 85 %
V General Specification
Market Place
Miesast/Africa
EU/CIS
Band
LG LG
Standard input Voltage
110 ~240 V 50/60Hz
230V 50Hz
Remark
Initial
- 7 -
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
1. Application Object
This specification can be applied to all the television related to CW62C Chassis
2. Notes
(1) Because this is a cold chassis, it is not necessary to use
an isolation transformer. However,operating it using a
transformer between the power supply line and chassis
input to prevent electric shock and to protect the test instrument.
(2)All adjustments must be done in correct sequence.
However, for better productivity, it can be changed in a pre­permitted range.
(3) Environment conditions: If not specified, it must be done in
following conditions.
1) Temperature: 25±5°C
2) Humidity : 65±10% (4) AC Voltage 220V ±10% (5) If not specified, the receiver must be operated for more
than 20 minutes prior to the adjustment.
(6) Signal: Received the standard color signal. (65dB±1dBuV)
PAL/SECAM: LG standard signal means the digital pattern PAL_EU 05CH
3. Adjust Item
3.1.1. Preparation for Adjustment.
- Receive PAL-B/G 07ch.(Cross hatch pattern) likes fig.1.
- Select the Picture mode to Standard or clear.
3.1.2. Adjustment.1
Adjust FOCUS VOLUME(the top volume of FBT)
¨and make the FOCUS of vertical line on the quarter of screen(red area in fig.1) achieve the best state.
3.2. Purity and Convergence adjustment
Following direction is a case using of None-ITC CPT for CPT manufacture factory. This adjustment should be done as below direction.
3.2.1. Purity adjustment
a. Do degauss CPT and Cabinet b. Receive Red Raster signal. (Gumi PG50ch.) c. Unfasten fixing Screw of DY, close DY to CPT Funnel DY
as possible as you can.
d. Make R-Land be centered as cross Purity Magnet
That time,4th 6th magnet should keep free gauss status.
e. Make uniform RED Raster as moving DY,
Check there is purity problem or not on R/G/B, white
Raster.Then, Fix screw of DY.
(At this time, be careful about inclination and DY should be
fixed keeping horizontality)
f. Check the TV in direction of EAST, WEST, SOUTH,
NORTH,. Adjust with supporting MAGNET when adjustment is not operated ..
3.2.2. Adjustment for Convergence
This adjustment should be operated at the best condition of
FOCUS after finishing the PURITY adjustment.
1) BACK RASTER receives black CROSS HATCH signal.
2) Adjust Brightness so that there are 9-12 dots.
3) Widen two tabs of 4pole Magnet with equal angles and accord red, blue vertical lines at the center of screen.
4) With keeping angle of "c. clause", rotate tab and accord red/blue, green vertical lines at the center of screen.
- 8 -
ADJUSTMENT INSTRUCTIONS
A
B
<Fig 1. Cross-Hatch Pattern(NTSC:US 09CH, PAL:E-7 CH)
Integrate DY and Magnet into CPT
CPT Assembly
As preparatory operations before assembling CPT, wind cotton Tape for protecting to CPT NECK and DY, CPT connection parts. At this moment, end of tape should be over-lapped and wound in direct route to the NECK.
It needs minimum 15 minutes for heat run under "standard" picture condition.
DY FIXED Torque 9~11 kg f.cm
Fix the Magnet to the position as shown picture below. Be careful not to make CPT neck shadow while adjusting DY.
HEAT RUN
Degaussing
STC Pre-Adjustment
Purity adjustment
DY Fixing
SCREEN Voltage adj.
W/B Fix
FOCUS adjustment
STC adujustment
DYC adujustment
Fig.2 Adjustment Sequence
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
Convergence Magnet
15 ~ 20mm
6Pole
4
2
5) Widen two tabs of 6pole Magnet with equal angles and accord red, blue vertical lines at the center of screen.
6) With keeping angle of "e. clause", repeat the adjustment from c to e keeping in mind the movement of red, blue, green when the horizontal lines are twisted.
7) Move DY up, down, left, right and make the convergence to be optimal condition and stick rubber wedge to CPT so that the DY not to move.
3.3 SCREEN & WHITE BALANCE Adjusting
3.3.1. Manual Adjustment Method (use remoncon for adjusting)
1) Adjust in on RF signal condition or no signal condition.
2) Press ADJ KEY of SVC T/X and select 2.SCREEN ADJ key for adjustment and generate horizontal line.
Turn the Screen Volume so that horizontal line not to be
shown and then change oppositely to finish the adjustment at the showing place.
3.3.2. WHITE BALANCE Manual Adjustment.( INSTART -> SERVICE1)
1) TV set receive 100% White Pattern signal
2) In the state of default setting,adjust BLO-R(R CUT), BLO­G(G CUT)
3) In default setting Data
BG(B-DRIVE) is 32,adjust RG(R-
DRIVE), GG(G-DRIVE)
X,Y coordinate satisfy color coordinate below,adjust HIGH
LIGHT(35FL)°
Adjust repeatedly until HIGH LIGHT, LOW LIGHT match.
W/B setting default data refers to W/B TABLE based on
different MODEL.
1. IC
2. White balance IIC Parameter (Address)
3.Color coordinate
3.4 Deflection Setting Data Adjustment
3.4.1. Adjustment Preparation
(1) TV set receive Digital pattern (PAL: E5ch.) (2) Deflection setting data adjustment can be done only with
remote control.
(3) Press the “INSTART” Key on the factory remote control
continuously to enter Deflection Adjustment mode.
(4) Press the CH
D ,E Key to select adjustment item.
(5) Press the
F ,G Key to change the data.
3.4.2. Adjustment
1.Deflection Setting Data Adjustment,adjust in N50Hz (PAL) mode firstly, In USB applied models,PAL Mullti regions,N60Hz(Digtal Pattern)
needs defleetion data adjustment.(07.09.11) then separately adjust N60Hz(NTSC), Z60Hz, N50Hz, W50Hz, Z50Hz.(Model with ARC function)
(In N60Hz adjustment, data more than N60Hz can auto transfer accordingly to N60Hz compensate value, please pay attention to it.)
2. Korea Model adjust only in N60Hz.
3. Middle/south America Model first adjust in N60HZ,then in N50(PAL-N ).
4. After finishing deflection setting data adjustment, press ENTER KEY,then save it and escape adjustment Mode.
Deflection Setting ITEM
1. V SLOPE
CPT center line aim at black background !
2. V SHIFT (VS)
Keep accord with vertical center line of received picture and
CPT
3. V LINEAR (VL)
Adjust the top & bottom size of inner circle to be equal on PAL
E05 CH.
Program Sub Add
Start Bit Stop Bit
Offset
Polarity
EP_Rom_S
B(R)_Amp
Win31_wb TWB
20
5 0 0 1
36
B(R)_Cut
Win31_wb TWB
17
5 0 0 1
33
G_Amp
Win31_wb TWB
21
5 0 0 0
37
- 9 -
Item
X Y
Color
Temperature
288 295
9000
degree
268 273
1300
degree
267 276
1300
degree
282
288 10000 degree
266
282 13000 degree
EU
N-EU
KOREA /Taiwan
Middle/South
America
Philippines
<Table 1> WHITE BALANCE Color Coordinate
Item
BLO-R(R CUT)
BLO-G(G CUT)
RG(R DRIVE) GG(G DRIVE) BG (B DRIVE)
LOW
LIGHT
HIGH
LIGHT
0 ~ 63 0 ~ 63 0 ~ 63 0 ~ 63 0 ~ 63
32 32 32 32 32
PAL
fixed
Range
default setting data
remarks
<Table 2> WHITE BALANCE default setting data
<Table 3>W/B auto adjust machine setting Table
VCD IC
EP_ROM
Name
Maker
NOTE
Program
Vcd Slave
Win31_wb
TWB
8A
Eeprom_Slave
Win31_wb
TWB
A0
Speed1Delay
30
SPEED/PLUS
2
22
2
G_Cut
Win31_wb TWB
18
5 0 0 0
34
Mode
High Light
Low
Light
0 0 0 0
Algorithm
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
4. V AMPLIT (V AMPITUDE)
PAL signal: Adjust upper and lower part of circle from the effective
screen of the CPT to be distance of 6~7mm .
5. H SHIFT (HS)
Adjust the vertical center line of a digital circle pattern is in accord with geometric vertical center of the CPT.
6. EW WIDTH (EW)
Adjust outer line of the left/right outer lattice to be united with
effective boundary surface of CPT.
Adjust of [Fig 4] 0~25% scope on external lattice from PAL
adjustment.
7. EW PARAB (EW PARABOLA)
Adjust so that middle portion of the outer most left and right vertical line looks like parallel with vertical lines of the CPT.
8. EW TRAPE (EW TRAPEZOID)
Keep accord with the top and the undersurface horizontal scope.
(When picture distorts£¨adjust until it is the square.)
9. EW UPCOR & EW LOCORR
Adjust so that corner vertical line of upper-left ,upper-right, lower-
left and lower-right to be optimization.10. H BOW
Adjust until distortion scope of the edge part in the top and the undersurface of the picture are the same.
11. H PARALL (ANGLE)
In angle adjustment, adjust until inclination of center vertical line
should be vertical precisely.
12. SCORRECT (S CORRECTION)
Adjust so that the lattice scopes of top, center, bottom of received pattern are the same. Use the default setting data (Initial data) of CPT owing to using DY data of CPT.
13. V SCROLL
Keep accord with the geometry vertical center line of received picture and the vertical center of CPT.
14. V ZOOM
VERTICAL ZOOM
15. WBR
16. WBF
17. PIP_ H (PIP H Position) Adjustment* - option
In PAL Channel (E5 CH), when adjust PIP_H position, it will
automatic convert into Double Window Mode.
PIP H Position adjust stand-by picture state, use VOL+, - KEY to
move H-Position or V-Position of sub-picture.
When PIP picture and main picture connect, press VOL+ KEY to
adjust.
3.5 Deflection setting default
- P A L
[Table 4] Deflection setting default based on different model
(SERVICE 2)
- 10 -
[Fig.5] Cross-Hatch Pattern (PAL:E-7 CH)
CRNU
CRNL
CRNU6
EP
CRNL6
Adjusting Point
Actual picture size
[fig.4] PAL Digital Pattern (EU05CH)
[Fig.5] PIP H Position Adjust Picture
Copyright©2007 LG Electronics.Inc. All right reserved. Only for training and service purposes.
LGE Internal Use Only
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