LG 50PA6500-SA (CHASSIS:PB21A) Service Manual ▷ View online
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Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
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 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
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 1 M
Ω and 5.2 MΩ.
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 1.5 K / 10 watt resistor in parallel with a 0.15 uF 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
0.5 mA.
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
IMPORTANT SAFETY NOTICE
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
0.15u
SAFETY PRECAUTIONS
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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This spec sheet is applied all of the PDP TV with PB21A chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
(4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with
BOM.
(5) The receiver must be operated for about 5 minutes prior to the adjustment.
3. Test method
(1) Performance: LGE TV test method followed
(2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC
4. Model General Specification
No
Item
Specification
Remark
1
Receiving System
1) SBTVD / NTSC / PAL-M / PAL-N
50A6500-SA
50A4900-SA
2) DVB-T
42/50PA4500-DF
2
Available Channel
1) VHF : 02~13
2) UHF : 14~69
3) DTV : 07-69 (VHF high/UHF)
4) CATV : 02~135
50A6500-SA
50A4900-SA
1) VHF : 02~13
2) UHF : 14~69
3) DTV : 14~69 (UHF)
4) CATV : 02~135
42/50PA4500-DF
3
Input Voltage
1) AC 100 ~ 240V 50/60Hz
4
Market
Brazil / chile / Peru / Venezuela / Costarica / Uruguay
5
Screen Size
42 inch Wide(1024 × 768)
50 inch Wide(1024 × 768)
50 inch Wide(1920 × 1080)
60 inch Wide(1920 × 1080)
42PA all model
50PA4 all model
50PA6 all model
60PA6 all model
6
Aspect Ratio
16:9
7
Tuning System
FS
8
Module
PDP42T4#### (1024 × 768)
PDP50T4#### (1024 × 768)
PDP50R4#### (1920 × 1080)
PDP60R4#### (1920 × 1080)
42PA all model
50PA4 all model
50PA6 all model
60PA6 all model
9
Operating Environ-
ment
1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10
Storage Environ-
ment
1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %
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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to PB21A chassis applied PDP TV all
models manufactured in TV factory.
2. Specification
(1) Because this is not a hot chassis, it is not necessary to
use an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order. But it is
flexible when its factory local problem occurs.
(3) T he adjustment must be performed in the circumstance of
25 °C ± 5 °C of temperature and 65 % ± 10 % of relative
humidity if there is no specific designation.
(4) The input voltage of the receiver must keep AC 100-240
V~, 50/60 Hz.
(5) Before adjustment, execute Heat-Run for 5 minutes.
■ After Receive 100% Full white pattern (06CH) then
process Heat-run
(or “8. Test pattern” condition of Ez-Adjust status)
■ How to make set white pattern
1) Press Power ON button of Service Remocon
2) Press ADJ button of Service remocon. Select “10. Test
pattern” and, after select “White” using navigation
button, and then you can see 100% Full White pattern.
* In this status you can maintain Heat-Run useless any
pattern generator
* Notice: if you maintain one picture over 20 minutes
(Especially sharp distinction black with white
pattern – 13Ch, or Cross hatch pattern – 09Ch)
then it can appear image stick near black level.
3. Adjustment items
3.1. PCB Assembly adjustment
■ Adjust 480i Comp1
■ Adjust 1080p Comp1/RGB
● If it is necessary, it can adjustment at Manufacture Line
● You can see set adjustment status at “9. ADJUST
CHECK” of the “In-start menu”
3.2. Set Assembly Adjustment
■ EDID (The Extended Display Identification Data )
■ Color Temperature (White Balance) Adjustment
■ Make sure RS-232C control
■ Selection Factory output option
4. PCB Assembly Adjustment
4.1. Using RS-232C
- Adjust 3 items at 3.1. PCB assembly adjustments
" 4.1. ■ Adjustment sequence" one after the order.
■ Adjustment sequence
■ Necessary items before Adjustment items
● Pattern Generator : (MSPG-925FA)
● Adjust 480i comp1
(MSPG-925FA:model :209, pattern :65) - comp1 Mode
● Adjust 1080p comp1
(MSPG-925FA:model :225 , pattern :65) - comp1 Mode
● Addjust RGB (MSPG-925FA:model :225 , pattern :65)
- RGB-Pc Mode
* If you want more information then see the below Adjustment
method (Factory Adjustment)
■ Adjustment sequence
● aa 00 00: Enter the ADc Adjustment mode.
● xb 00 40: change the mode to component1 (No actions)
● ad 00 10: Adjust 480i comp
● ad 00 10: Adjust 1080p comp
● xb 00 60: change to RGB-Pc mode(No action)
● ad 00 10: Adjust 1080p RGB
● xb 00 90: Endo of Adjustmennt
Order
command
Set response
1. Inter the
Adjustment
mode
aa 00 00
a 00 OK00x
2. Change the
Source
XB 00 40
XB 00 60
b 00 OK40x (Adjust 480i Comp1 )
(Adjust 1080p Comp1)
b 00 OK60x (Adjust 1080p RGB)
3.Start Adjustment ad 00 10
4. Return the
4. Return the
Response
OKx ( Success condition )
NGx ( Failed condition )
5. Read
Adjustment
data
( main )
ad 00 20
( main )
ad 00 30
(main : component1 480i, RGB 1080p)
000000000000000000000000007c007b-
006dx
(main : component1 1080p)
000000070000000000000000007c0083
0077x
6. Confirm
Adjustment
ad 00 99
NG 03 00x (Failed condition)
NG 03 01x (Failed condition)
NG 03 02x (Failed condition)
OK 03 03x (Success condition)
7. End
of Adjustment
ad 00 90
d 00 OK90x
< See ADc Adjustment RS232c Protocol_Ver1.0 >
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5. Factory Adjustment
-> PU21A/PB21A : USE INTERNAL ADC(LM1) : using internal
pattern.
5.1. Auto Adjust Component 480i/1080p RGB
1080p
■ Summary : Adjustment component 480i/1080i and RGB
1080p is Gain and Black level setting at Analog
to Digital converter, and compensate the RGB
deviation
■ Using instrument
● Adjustment remocon, 801GF(802B, 802F, 802R) or
MSPG925FA pattern generator
( It can output 480i/1080i horizontal 100% color bar
pattern signal, and its output level must setting
0.7V±0.1V p-p correctly)
● You must make it sure its resolution and pattern cause
every instrument can have different setting
● Adjustment method 480i Comp1, Adjust 1080p Comp1/
RGB (Factory adjustment)
● ADC 480i Component1 adjustment
- Check connection of Component1
- MSPG-925FA -> Model: 209, Pattern 65
● Set Component 480i mode and 100% Horizontal Color
Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
● ADC 1080p Component1 / RGB adjustment
- Check connection both of Component1 and RGB
- MSPG-925FA -> Model: 225, Pattern 65
● Set Component 1080p mode and 100% Horizontal Color
Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
● After get each the signal, wait more a second and enter
the “IN-START” with press IN-START key of Service
remocon. After then select “7. External ADC” with
navigator button and press “Enter”.
● After Then Press key of Service remocon “Right Arrow
(VOL+)”
● You can see “ADC Component1 Success”
● Component1 1080p, RGB 1080p Adjust is same method.
● Component 1080p Adjustment in Component1 input
mode
● RGB 1080p adjustment in RGB input mode
● If you success RGB 1080p Adjust. You can see “ADC
RGB-DTV Success”
* caution : Set Volume 0 after adjustment
- ADJ(EZ ADJUST) -> 6.ADC Calibration -> ADC
Calibration(START)
* EDID (The Extended Display Identification Data)/DDC
(Display Data Channel) Download.
■ Summary
● It is established in VESA, for communication between
PC and Monitor without order from user for building
user condition. It helps to make easily use realize
“Plug and Play” function.
● For EDID data write, we use DDC2B protocol.
- Auto Download
■ After enter Service Mode by pushing “ADJ” key,
■ Enter EDID D/L mode.
■ Enter “START” by pushing “OK” key.
Caution:
- Never connect HDMI & D-sub Cable when the user
downloading .
- Use the proper cables below for EDID Writing
< Adjustment pattern : 480i / 1080p 60Hz Pattern >