LG PF50KA User manual

P/NO : MFL70422203 (1711-REV00)
CHASSIS : FZ81A
MODEL : PF50KA PF50KA-NA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
DLP PROJECTOR
SERVICE MANUAL
CONFIDENTIAL
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.

- 2 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SPECIFICATION ...................................................................................... 4
SOFTWARE UPDATE .............................................................................. 6
BLOCK DIAGRAM ................................................................................... 7
EXPLODED VIEW .................................................................................... 8
DISASSEMBLY GUIDE ............................................................................ 9
ASSEMBLY GUIDE ................................................................................ 10
TROUBLE SHOOTING GUIDE ............................................................... 11

- 3 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
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 PROJECTOR 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 MΩand 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
SAFETY PRECAUTIONS

- 4 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This spec sheet is applied all of the DLP Projector with
FZ81B/C chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C, CST: 40 °C ± 2 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (100~240V @ 50/60Hz)
* 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 30 minutes prior
to the adjustment
3. Test method
(1) Performance: LGE PROJECTOR test method followed
(2) Required other specification
-Safety : KCC, IEC, CE specification (EN55022 Class B),
CCC.
-EMC : KCC, IEC, CE specification (EN60950-1), CCC.
-Wireless: WIFI module, Bluetooth module – Korea
4. Model General Specification
No Item Specication Remark
Min Typ Max Unit
1Video input applicable
system ATSC / NTSC(NTSC-M) PF50KA-NA, PF50KA-KR only
2 Available channel
1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~158
5) CADTV: 01~158
PF50KA-NA,
PF50KA-KR only
3 Power DC 19V @ 3.42A (65W) Set only
4 Input Voltage AC 100 ~ 240(±10%)V, 50/ 60Hz
5 Market
Korea PF50KA-KR
US PF50KA-NA
Europe PF50KS-EU
Global PF50KG-GL
6 Picture size FULLHD (1920 x 1080) With Actuator
(native: 1368X768)
7 Aspect ratio 16:9 Panel Resolution
8Operating Temperature 0 40 Deg
9 Operating Humidity 80 %
10 Storage Temperature -20 60 Deg
11 Storage Humidity 85 %

- 5 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5. External Input Support Format
5.1. 2D MODE
5.1.1. HDMI Input (PC/DTV)
No. Resolution H-freq (kHz) V-freq (Hz) Pixel clock
(MHz) Proposed DDC
HDMI-PC
1 640*350 @70Hz 31.46 70.09 25.17 EGA X
2 720*400 @70Hz 31.46 70.08 28.32 DOS O
3 640*480 @60Hz 31.46 59.94 25.17 VESA(VGA) O
4 800*600 @60Hz 37.87 60.31 40.00 VESA(SVGA) O
5 1024*768 @60Hz 48.36 60.00 65.00 VESA(XGA) O
6 1152*864 @60Hz 54.34 60.05 80.002 VESA O
7 1280*1024 @60Hz 63.98 60.02 108.0 VESA (SXGA) O
8 1360*768 @60Hz 47.71 60.01 85.50 VESA (WXGA) O
9 1920*1080 @60Hz 67.5 60.00 148.5 WUXGA(CEA 861D) O
HDMI-DTV
1 640*480 31.46 59.94 25.125 SDTV 480P
2 640*480 31.50 60.00 25.125 SDTV 480P
3 720*480 31.47 59.94 27.00 SDTV 480P
4 720*480 31.50 60.00 27.027 SDTV 480P
5 1280*720 44.96 59.94 74.176 HDTV 720P
6 1280*720 45.00 60.00 74.25 HDTV 720P
7 1920*1080 33.72 59.94 74.176 HDTV 1080I
8 1920*1080 33.75 60.00 74.25 HDTV 1080I
9 1920*1080 26.97 23.97 74.176 HDTV 1080P
10 1920*1080 27.00 24.00 74.25 HDTV 1080P
11 1920*1080 33.71 29.97 74.176 HDTV 1080P
12 1920*1080 33.75 30.00 74.25 HDTV 1080P
13 1920*1080 67.43 59.94 148.352 HDTV 1080P
14 1920*1080 67.50 60.00 148.50 HDTV 1080P

- 6 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SOFTWARE UPDATE
(1) Downlaod rmware in LGE Website
(2) Make “lg_dtv” folder in USB Root
(3) Copy rmware le to “lg_dtv” folder
(4) After Projector power on, insert USB memory stick.
(5) “Software update” Popup displays after 10 seconds.
(6) Select “YES” , using right arrow key. Software update will begin. If you don’t want to update SW Select “NO”.
(7) If updated successfully, Projector will be turn off automatically.
(8) You can eject USB Memory stick after Projector turned off.

- 7 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
MAIN SOC
Micom
IC,FPGA
IC,
Microprocessors
IC,
Microprocessors
LDO
Regulator
FAN *3
EEPROM
256Kb
IR
KEYPAD
eMMC
4GB
DDR3
4Gb*2
X-tal
24Mhz
KEYSTONE
IC
Audio AMP
DDR3
1Gb
Serial Flash
32Mb
Oscilator
48Mhz
IC,PMIC
Serial Flash
32Mb
Serial Flash
32Mb
Oscilator
24Mhz
LVDS
I2C
TTL
Charger
Battery
2S2P
SPI
I2C
WUZZˉG
DMD
I2C
I2C
WIFI & Bluetooth
Combo
PROJ_ON
Headphone
DC_IN
HDMI
USB 3.1
(Type C)
Mux
PD DP/DM
Conv.
DP
USB SW
HDMI/ARC
Tuner
TDJS_H501F
USB2.0
(Type-A)
1W
SPK
1W
RJ45
System
Main
L
R
BLOCK DIAGRAM

- 8 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the 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.
IMPORTANT SAFETY NOTICE
510
520
550
310
720
730
300
540
120
100
600
400
560
AR2
710

- 9 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY GUIDE
1. Top Assy + Bottom Assy
- Leg Foot 4ea Disassemble
- Φ2.5 X L6 Screw 4ea Disassemble
2. Top Assy + Bottom/Rear Assy
- 2ea hook Disassemble (Rear Case)
- 3ea hook Disassemble (Bottom Case)
3. Rear Case 2ea hook Disassemble
4. Main PCB
- Φ2 X L6 Screw 3ea Disassemble
5. Bottom Assy + Engine Assy
- Φ2.5 X L6 3ea Disassemble
6. Bottom Assy + Fan Assy (2ea)
+ Speaker(2ea ) + Wifi (1ea) Disassemble
Screw Hook
7. Bottom Assy + Cover Battery/Battery
- Φ2.5 X L6 Screw 2ea Disassemble
- 2ea hook Disassemble
8. Top Assy + Button/Keypad
- Φ2.0 X L4 Screw 3ea Disassemble
- 2ea hook Disassemble
1. Top Assy + Bottom Assy
- Leg Foot 4ea Disassemble
- Φ2.5 X L6 Screw 4ea Disassemble
2. Top Assy + Bottom/Rear Assy
- 2ea hook Disassemble (Rear Case)
- 3ea hook Disassemble (Bottom Case)
3. Rear Case 2ea hook Disassemble
4. Main PCB
- Φ2 X L6 Screw 3ea Disassemble
8. Top Assy + Button/Keypad
- Φ2.0 X L4 Screw 3ea Disassemble
- 2ea hook Disassemble
7. Bottom Assy + Cover Battery/Battery
- Φ2.5 X L6 Screw 2ea Disassemble
- 2ea hook Disassemble
5. Bottom Assy + Engine Assy
- Φ2.5 X L6 3ea Disassemble
6. Bottom Assy + Fan Assy(2ea)
+ Speaker(2ea) + Wifi(1ea) Disassemble

- 10 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
ASSEMBLY GUIDE
1. Bottom Assy + Battery/Cover Battery
- 2ea hook Assemble
- Φ2.5 X L6 Screw 2ea Assemble
2. Bottom Assy + Engine Assy
- Φ2.5 X L6 3ea Assemble
3. Bottom Assy + Fan Assy (2ea)
+ Speaker(2ea ) + Wifi (1ea) Assemble
4. Main PCB
- Φ2 X L6 Screw 3ea Assemble
5. Rear Case 2ea hook Assemble
6. Top Assy + Button/Keypad
- 2ea hook Assemble (Keypad+Button )
- Φ2.0 X L4 Screw 3ea Assemble
Screw Hook
7. Top Assy + Bottom/Rear Assy
- 3ea hook Assemble (Bottom Case)
- 2ea hook Assemble (Rear Case)
1. Bottom Assy + Battery/Cover Battery
- 2ea hook Assemble
- Φ2.5 X L6 Screw 2ea Assemble
2. Bottom Assy + Engine Assy
- Φ2.5 X L6 3ea Assemble
3. Bottom Assy + Fan Assy(2ea)
+Speaker(2ea) + Wifi(1ea) Assemble
4. Main PCB
- Φ2 X L6 Screw 3ea Assemble
5. Rear Case 2ea hook Assemble
8. Top Assy + Bottom Assy
- Φ2.5 X L6 Screw 4ea Assemble
- Leg Foot 4ea Assemble
7. Top Assy + Bottom/Rear Assy
- 3ea hook Assemble (Bottom Case)
- 2ea hook Assemble (Rear Case)
6. Top Assy + Button/Keypad
- 2ea hook Assemble (Keypad+Button)
- Φ2.0 X L4 Screw 3ea Assemble

- 11 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
TROUBLE SHOOTING GUIDE
1. Poor Connection
- Main, LED Board Ass’y
No. Circuit Number Pin count Connections Symptoms of a bad connection
1A,1B P1030, P1031 6/12 LED(R,G,B) Display turns off immediately after power on. or no image
(none functional of LED)
2 P901 80 DMD Board No image (none functional of DPP ASIC)
3A,3B P400, P402 4 FAN Fan doesn’t work, and set turns off automatically
4 P201 4 Speaker No sound from the left/right speaker.
5 P601 10 Keypad Joystick Keys is not functional.
6 P500 6 Battery Battery Function is not working
7 P200 12 WIFI, Bluetooth Wi-Fi, Bluetooth Function is not working
Board connection point
3A
1A
4
1B
2
3B
5
6
7

- 12 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SET Trouble
SET Power On
Yes
No
(Keypad LED
Not working)
SET on then turned
off automatically?
Check Power cord connection
Disconnect the MAIN, LED power cable and measure
the adapter voltage
Check Fan Operation
Check FAN Connector
Check FAN malfunction
Check Main
malfunction
Check FAN 4P Cable
Check DMD Cable
DMD Assy B’d
replacement and Check
Check Main Assy
Check Main malfunction
Check Main board
Yes
Yes
Yes
No
No
No
No
(Keypad LED
works)
“FAN Error” “High Temp Error”
Yes
Check LED malfunction
Check adapter malfunction
Check DMD connection cable
Check DMD board malfunction
Check DMD parts malfunction
Check Mainboard malfunction
Check LED connection
Check Mainboard malfunction Check LED board malfunction
LED on but No image LED not turning on
If turned off automativally, Symptoms can be checked at power off status of Instart
Replace Main Assy
Image distorted
(vertical/ horizontal bar occur)
Check NTC 3P Cable
Check Main malfunction
2. Flow Chart by symptoms