LG 50PG70FD User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PA81C
MODEL : 50PG70FD 50PG70FD-AB
website:http://biz.LGservice.com
Internal Use Only
CH
VOL
MENU
INPUT ENTER

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
CONTENTS
CONTENTS ....................................................................................................... 2
SAFETY PRECAUTIONS....................................................................................3
SPECIFICATION..................................................................................................4
ADJUSTMENT INSTRUCTION...........................................................................5
TROUBLE SHOOTING......................................................................................11
BLOCK DIAGRAM ............................................................................................20
EXPLODED VIEW ........................................................................................... 25
SVC. SHEET .....................................................................................................27
PRINTED CIRCUIT DIAGRAM..........................................................................36

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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 lsolation 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 circuitary that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this monitor 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.
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 positioin, 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 1MΩand 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 esposed 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 sepcified, 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
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement .
VApplication Range
This spec is applied to the 60” PLASMA TV used PA81A Chassis.
V Specification
Each part is tested as below without special appointment.
1) Temperature : 25±5°C (77±9°F), CST : 40±5
2) Relative Humidity: 65±10%
3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz)
* Standard Voltage of each product is marked by models.
4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.
5) The receiver must be operated for about 20 minutes prior to the adjustment.
VTest Method
1) Performance : LGE TV test method followed.
2) Demanded other specification
Safety : CB specification
EMC : CISPR 13 specification
VGeneral Specification ( 60” WXGA )
Chassis
PA81C 50/60PG30FD-AA
50/60PG70FD-AB Australia LG
Model Name Market Brand Remark
50/60PG30FD-AA
50/60PG70FD-AB Safety : IEC/EN60065
EMI : CISPR 13 Class B
Australia
Model ApplianceMarket Remark

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
1. Application Range
This spec. sheet is applied to all of the PA81A, PA81C
chassis manufactured at LG TV Plant all over the world.
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.
(3) The adjustment must be performed in the circumstance of
25±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 100~240V,
50/60Hz.
(5) The receiver must be operated for about 15 minutes prior
to the adjustment.
OAfter RGB Full White in HEAT-RUN Mode, the receiver
must be operated prior to the adjustment.
OEnter into HEAT-RUN MODE
1) Press the POWER ON KEY on R/C for adjustment.
2) Press the ADJ KEY on R/C and enter EZ ADJUST
- Select “3. Test Pattern” by using D/E(CH +/-) and
press ENTER(V)
- Select “White” by using F/G(VOL +/-) and press
ENTER(V)
* Set is activated HEAT-RUN without signal generator in
this mode.
* Single color pattern ( RED / BLUE / GREEN ) of HEAT
RUN MODE uses to check panel.
* Caution : If you turn on a still screen more than 20
minutes (Especially digital pattern, cross hatch pattern),
an after image may be occur in the black level part of
the screen.
PCB Assembly Adjustment Method
Caution: Using ‘power on’ button of the control R/C , power
on TV.
All adjustment process is executed one time through RS-
232C.
Do not connect external input cable.
Power off TV After adjustment method, not using ‘in-stop’
button of control R/C
3. S/W Auto Download Using the
USB Memory Stick
Caution: Using ‘power on’ button of the control R/C, power on
TV.
USB file (EPK) version must be bigger than downloaded
version of main B/D.
(1) Insert the USB memory stick to the PCB ASSEMBLY.
(2) Using ‘power on’ button of the control R/C, power on TV.
(3) S/W download process is executed automatically.
4. Auto-control Adjustment Process
(1) All adjustment process is executed one time through RS-
232C.
(2) Command send (ADC Calibration (Model name
download (EDID download.
ADJUSTMENT INSTRUCTION
1
2
3
4
5
6
7
8
9
10
Ready
ADC
ADC
Confirmation
ADC
Mode Out
Download
Mode In
EDID
Download
Check EDID
Status
Define model
name
Adjustment
Confirmation
Download
Mode Out
NO Item Remark CMD1 CMD2 Data 0
a
a
a
a
a
a
a
a
a
a
d
d
d
d
e
e
e
e
e
e
0
0
9
0
0
0~4,9
0~4,9
1~7
9
0
0
1
9
9
0
1
2
5
9
9
Ready
ADC start
Transmitting adjustment mode In
instruction, operate adjustment command.
All=0 ; HDMI1,2,3,4=1,2,3,4 ; RGB=9
All=0 ; HDMI1,2,3,4=1,2,3,4 ; RGB=9
Model define index(Data0) are listed at
next table.
EDID data existence check in SET
assembly

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
OAdjsutment process protocol(RS-232C)
5. Manual Model Name Download
(1) Press ADJ key on R/C for model name D/L
(2) Select “0. Model Option” and press ENTER(V)
(3) Select model name by using D/E(CH +/-) and press
ENTER(V)
6. Manual ADC Adjustment
OAdjustment is done using internal ADC, so input signal is
not necessary.
ODo not connect external input cable.
ORequired Equipment
Remote controller for adjustment
(1) Press ADJ key on R/C for adjustment.
(2) Select “1. ADC calibration” by using D/E(CH +/-) and
press ENTER(V)
(3) Select “Start” by using F/G(VOL +/-) and press ENTER(V)
(4) ADC adjustment is executed automatically.
7. Manual EDID Download
Caution: Do not connect HDMI and RGB cable.
(1) Press ADJ KEY on R/C and enter EZ ADJUST.
(2) Select “5.EDID D/L” by using D/E(CH+/-) and press
ENTER(V).
(3) Select “Start” and press ENTER(V).
(4) EDID download is executed automatically.
(5) Press EXIT key on R/C.
7-1. EDID DATA
(1) RGB EDID
Numbers in the red line is week & year manufacture and
numbers in the blue line is check sum.
(2) HDMI EDID
1) HDMI 1
Numbers in the red line is week & year manufacture and
numbers in the blue line is check sum.
2) HDMI 2
Numbers in the red line is week & year manufacture and
numbers in the blue line is check sum.
a
a
a
a
a
a
a
a
a
e
e
e
e
e
e
e
e
e
5
5
5
5
5
5
5
5
5
1
2
3
4
5
6
7
8
9
60PG30UD-AA
50PG60UD-AA
50PG20D-AA
42PG60UD-AA
42PG20D-AA
60PG70FD-AB
50PG70FD-AB
60PG30FD-AA
60PG30FD-AA
CMD1 CMD2 Data 0 Remark
60PG30UD-AA
50PG60UD-AA
50PG20D-AA
42PG60UD-AA
42PG20D-AA
60PG70FD-AB
50PG70FD-AB
60PG30FD-AA
50PG30FD-AA
13030130
36030130
32013360
56030130
52013360
17015131
37015131
13015130
33105130
Model Name Model Option Value
NO SIGNAL or White noise NO SIGNAL
RF Input AV / Component / RGB input
a
a
a

3) HDMI 3
Numbers in the red line is week & year manufacture and
numbers in the blue line is check sum.
4) HDMI 4
Numbers in the red line is week & year manufacture and
numbers in the blue line is check sum.
[Upper EDID Data used by 60PG30FD-AA model
Caution: It can be different from week & year manufacture and
check sum.
(Because week & year manufacture and check sum is
updated once a year)
ⓐProduct ID
SET Assembly Adjustment Method
Caution: Each PCB assembly must be checked by check JIG
set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
Set up “RF mode(noise)”before voltage adjustment.
8. POWER PCB Ass’y Voltage
Adjustment (Va, Vs Voltage adjustment)
8-1. Test Equipment :D.M.M. 1EA
8-2.Connection Diagram for Measuring
: refer to Fig.1, Fig.2, Fig.3, Fig.4, Fig.5
8-3. Adjustment Method
(1) 60” Va Adjustment(refer Fig. 1)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P811, connect
- terminal to GND pin of P811.
3) After turning VR901, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)
(2) 60” Vs Adjustment(refer Fig. 1)
1) Connect + terminal of D.M.M to Vs pin of P811, connect
–terminal to GND pin of P811.
2) After turning VR951, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)
(3) 50” Va Adjustment(refer Fig. 2)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P811, connect
- terminal to GND pin of P811.
3) After turning VR901, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)
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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
a
a
(Fig. 1) 60inch Power PCB Assy Voltage Adjustment

(4) 50” Vs Adjustment(refer Fig. 2)
1) Connect + terminal of D.M.M to Vs pin of P811, connect –
terminal to GND pin of P811.
2) After turning VR951, voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top. (Deviation;
±0.5V)
(5) 42” Va Adjustment(refer Fig. 3)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P811, connect -
terminal to GND pin of P811.
3) After turning VR901, voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top. (Deviation;
±0.5V)
(6) 42” Vs Adjustment(refer Fig. 3)
1) Connect + terminal of D.M.M to Vs pin of P811, connect –
terminal to GND pin of P811.
2) After turning VR951, voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top. (Deviation;
±0.5V)
(7) 50” Va Adjustment (refer Fig. 4)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D. M..M. to Va pin of P816, connect
-terminal to GND pin of P816.
3) After turning VR901,voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top (deviation;
±0.5V)
(8) 50” Vs Adjustment (refer fig. 4)
1) Connect + terminal of D. M..M. to Vs pin of P816, connect
-terminal to GND pin of P816.
2) After turning VR951, voltage of D.M.M adjustment as same
as Vs voltage which on label of panel right/top (deviation ;
±0.5V)
(9) 60” Va Adjustment (refer Fig. 5)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D. M..M. to Va pin of P816, connect
-terminal to GND pin of P816.
3) After turning VR901,voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top (deviation;
±0.5V)
(10) 60” Vs Adjustment (refer Fig. 5)
1) Connect + terminal of D. M..M. to Vs pin of P816, connect
-terminal to GND pin of P816.
2) After turning VR951, voltage of D.M.M adjustment as same
as Vs voltage which on label of panel right/top (deviation;
±0.5V)
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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
(Fig. 2) 50inch Power PCB Assy Voltage Adjustment
(Fig. 4) 50inch Full HD Power PCB Assy Voltage adjustment
(Fig. 5) 60inch Full HD Power PCB Assy Voltage Adjustment
(Fig. 3) 42inch Power PCB Assy Voltage Adjustment

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
9. Adjustment of White Balance
Caution: Press the POWER ON KEY on R/C before W/B
adjustment.
Before adjusting White-Balance, the AV ADC should be done.
If ADC status were “NG”, Need to ADC adjustment.
9-1. Required Equipment
(1) Color Analyzer (CS-1000, CA-100+(CH.10), CA-210
(CH.10) )
[Please adjust CA-100+ / CA-210 by CS-1000 before
measuring
—> You should use Channel 10 which is Matrix
compensated(White, Red, Green, Blue revised) by CS-
1000 and adjust in accordance with White balance
adjustment coordinate.
OColor temperature standards according to CSM and Module
OChange target luminance and range of the Auto adjustment
W/B equipment.
OWhite balance adjustment coordinate and color temperature.
[PC(for communication through RS-232C) -> UART Baud
rate : 115200 bps
9-2. Connection Picture of the Measuring
Instrument(On Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START -> Enter the
mode of White-Balance, the pattern will come out.
9-3. Auto-Control Interface and Directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked.(illumination is less than 10ux)
(2) In case of PDP: Measure and adjust after sticking the
Color Analyzer (CA-100+, CA210 ) to the side of the
module.
(3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
- In case of PDP, keep white pattern using inside pattern.
- In case of LCD, using ‘no signal’or ‘full white pattern’or
the others, check the back light on.
OAuto adjustment Map(RS-232C)
65
20 Range
Target luminance
0.276
0.283
0.000
0.276±0.002
0.283±0.002
0.000
0.276±0.002
0.283±0.002
0.000
X
y
uv
Cool CS-1000 CA-100+(CH.10) CA-210(CH.10)
0.285
0.293
0.000
0.285±0.002
0.293±0.002
0.000
0.285±0.002
0.293±0.002
0.000
X
y
uv
Medium CS-1000 CA-100+(CH.10) CA-210(CH.10)
0.313
0.329
0.003
0.313±0.002
0.329±0.002
0.003
0.313±0.002
0.329±0.002
0.003
X
y
uv
Warm CS-1000 CA-100+(CH.10) CA-210(CH.10)
Full White Pattern
RS-232C Communication
CA-210
Color
ANALYZER
TYPE : CA-210
(Fig. 6) Connecting picture(On Automatic Control)

9-4. Manual White Balance
(1) Zero Calibrate CA-100+ / CA-210, and when controlling,
stick the sensor to the center of PDP module surface.
(2) Press the ADJ KEY on R/C and enter EZ ADJUST
Select “2. White Balance”and press G(VOL +)
Set test-pattern on and display inside pattern.
(3) Control is carried out on three color temperatures, COOL,
MEDIUM,WARM.
(Control is carried out thress times)
<Temperature : COOL>
- R-Cut / G-Cut / B-Cut is set to 64
- Control R-Gain and G-Gain.
- Each Gain is limited to 192.
<Temperature : MEDIUM>
- R-Cut / G-Cut / B-Cut is set to 64
- Control R-Gain and G-Gain.
- Each Gain is limited to 192.
<Temperature : WARM>
- R-Cut / G-Cut / B-Cut is set to 64
- Control G-Gain and B-Gain.
- Each Gain is limited to 192.
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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only

TROUBLE SHOOTING GUIDE
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Only for training and service purposes LGE Internal Use Only

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Only for training and service purposes LGE Internal Use Only

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BLOCK DIAGRAM