LG HF85LA User manual

P/NO : MFL71103202 (1811-REV00)
CHASSIS : FZ91A
MODEL : HF85LA HF85LA-NA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
DLP PROJECTOR
SERVICE MANUAL
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
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

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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 FZ91A
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,NA
4. Model General Specification
No Item Specication Remark
Min Typ Max Unit
1Video input applicable
system
ATSC / NTSC HF85LA-KR only
ATSC /NTSC-M/64&256QAM HF85LA-NA only
2 Available channel
1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~158(HF85LA-KR)
01~135(HF85LA-NA)
5) CADTV: 01~158(HF85LA-KR)
01~135(HF85LA -NA)
HF85LA-KR / HF85LA-NA only
3 Power DC 19V @ 7.37A (140W) Set only
4 Input Voltage AC 100 ~ 240(±10%)V, 50/ 60Hz
5 Market
Korea HF85LA-KR
Europe HF85LS-EU, HF85LSR-EU
Japan HF85LS-JP
Global HF85LG-GL
North America HF85LA-NA
6 Picture size FULLHD (1920 x 1080)
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 %

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Only for training and service purposes.
5. Supported video resolutions
5.1. HDMI Input (PC/DTV)
No. Resolution H-freq (kHz) V-freq (Hz) Pixel clock (MHz) Proposed
HDMI-PC
1 640*350 31.46 70.09 25.17 EGA
2 720*400 31.46 70.08 28.32 DOS
3 640*480 31.46 59.94 25.17 VESA(VGA)
4 800*600 37.87 60.31 40 VESA(SVGA)
5 1024*768 48.36 60.00 65 VESA(XGA)
6 1360*768 47.71 60.01 84.75 VESA(WXGA)
7 1152*864 54.34 60.05 80 VESA
8 1280*1024 63.98 60.02 109.00 SXGA
9 1920*1080 67.5 60 158.40 WUXGA(Reduced Blanking)
HDMI-DTV
1 640*480 31.46 59.94 25.12 SDTV 480P
2 640*480 31.5 60.00 25.12 SDTV 480P
3 720*480 31.47 59.94 27 SDTV 480P
4 720*480 31.5 60.00 27.02 SDTV 480P
5 720*576 31.25 50.00 27 SDTV 576P
6 1280*720 44.96 59.94 74.17 HDTV 720P
7 1280*720 45 60.00 74.25 HDTV 720P
8 1280*720 37.5 50.00 74.25 HDTV 720P
9 1920*1080i 28.12 50.00 74.25 HDTV 1080I
10 1920*1080i 33.72 59.94 74.17 HDTV 1080I
11 1920*1080i 33.75 60.00 74.25 HDTV 1080I
12 1920*1080p 26.97 23.97 63.29 HDTV 1080P
13 1920*1080p 27.00 24.00 63.36 HDTV 1080P
14 1920*1080p 33.71 29.97 79.120 HDTV 1080P
15 1920*1080p 33.75 30.00 79.20 HDTV 1080P
16 1920*1080p 56.25 50.00 148.5 HDTV 1080P
17 1920*1080p 67.43 59.94 148.35 HDTV 1080P
18 1920*1080p 67.5 60.00 148.50 HDTV 1080P

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Only for training and service purposes.
SOFTWARE UPDATE
(1) Turn on Projector.
(2) Insert the USB including rmware.(The rmware must be copied to “LG_DTV” folder in USB)
(3) When insert USB to Projector, USB UPDATE window is displayed automatically.
(4) Select the [INSTALL] button, [USB UPDATE IN PROGRESS] window is displayed, and then update is started.
(5) Select the [Check Now] button, you can check the update progress.
(6) When update progress is completed, [NEW UPDATE INSTALLED] is displayed, and select the [YES] button,then Projector will
be restarted
(7) If Content list like a Picture 5 is displayed, select the [x] button, and keep going on update.
※ If Projector have been connected on Internet by Wired or Wireless AP, The Projector will Update by itself.

- 7 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
BLOCK DIAGRAM
MAIN
IC100
MICOM
IC600
KEYSTONE
IC800
Panel(S)
IC1010
Panel(M)
IC1000
FAN *1
EEPROM
256Kb
IR
KEYPAD
eMMC
4GB
X-tal
24Mhz
ACCELEROMETER
Audio AMP
IC700
X-tal
32Mhz
PMIC
IC1004
Serial Flash
32Mb
Serial Flash
32Mb
Oscillator
24Mhz
LVDS
I2C
TTL
SPI
I2C
WU[^ˉG
DMD
I2C
WIFI & Bluetooth
Combo
PROJ_ON
Headphone
DC_IN
HDMI
HDMI/ARC
Tuner
TDJS_H601F
USB2.0
(Type-A)
3W
SPK
3W
RJ45
Main
L
R
USB2.0
(Type-A)
SPDIF OUT
SPI
Jack
X-tal
32.768Khz
I2C
I2S
Phosphor
Wheel
LD : 35V 3.0 A
Wheel Driver
IC1009
Oscillator
2Mhz
CWI
LD Driver
IC1300
LD

- 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
AR2
300
310
320
530
700
100
800
400
120
130
600
540
550
510
560
590
570

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Only for training and service purposes.
DISASSEMBLY GUIDE
1. Remove the 4pcs screws.
2. Separate out the bottom case by using the jig
(Because of Hook structure)
Screw
3. Separate out the rear case from top case.
Need to spread both sides to prevent the
damage of top case’s hook.
4. Remove the 4 screws from mid-case
5. Separate out the engine from top case
6. Remove the screws, separate out the PCB
7. Remove the top case’s 4 pcs screws
8. Separate out the engine from middle case,
and then disassembly complete.

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Only for training and service purposes.
ASSEMBLY GUIDE
1.Middle case + Engine : Φ3 screw 4ea
2. Joystick + Middle case : Φ2 screw 2ea
3. Jack B/D+ Middle case : Φ2.6 Screw 3ea
4. Middle case + Fan + Speaker
5. Middle Case + Combo Assemble
6. Main B/D+ Middle case : Φ2.6 Screw 5ea
Bottom side
Right side
Left side
Combo module
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)PPL 4DSFX 
8. Rear Bracket + Top Case
9. Bottom Assy : Φ2.6 Screw 4ea

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Only for training and service purposes.
TROUBLE SHOOTING GUIDE
1. Poor Connection
- Main, LED Board Ass’y
2
1
45
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63
7
9
8
No. Circuit Number Pin count Connections Symptoms of a bad connection
1 P1000 80 DMD Board No image (none functional of DPP ASIC)
2 P602 40 Jack Board Cannot Working Remote Controller, Sound out(AV, SPDIF),
Wired Lan and DTV Tuner
3 P1003 3 P/W Index No Image (DMD Lock by Detecting Phospher wheel trouble)
4 P1002 4 P/W Motor No Image (DMD Lock by Detecting Phospher wheel trouble)
5 P700 4 Speaker No sound (Internal Speakers)
6 P601 10 Local Key Local Key doesn’t work or may be worked abnormally
7 P600 6 IR Board Cannot Work Remote Controller
8 P300 4 FAN Fan doesn’t work, and set turns off automatically
9 P100 8 WIFI, Bluetooth Wi-Fi, Bluetooth Function is not working

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Only for training and service purposes.
1. Poor Connection
- LD Driver, Jack Board Ass’y
%RDUGFRQQHFWLRQSRLQW
9
10
11
No. Circuit Number Pin count Connections Symptoms of a bad connection
9 P102 8 LD Bank Laser Lamp doesn’t Work
10 P101 20 Main Board Laser Lamp doesn’t Work, Set turns off automatically
11 P50 40 Main Board Cannot Working Remote Controller, Sound out(AV, SPDIF),
Wired Lan and DTV Tuner

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Only for training and service purposes.
SET problem
occurrence
YesSet turn off
Automatically?
Check a power cord connection
After Pulling out the adapter DC Plug
Adapter replacement
Temp problem
Or Fan problem?
FAN connection Check
FAN defect check
Main b/d defect check
Broken image
(Vertical/parallel bar)
DMD Cable check
Engine replacement
Yes
Yes“Temp”
No
No
DMD connection check
To check the Phenomena, Please check “power off status” in the In -Start
mode
as quickly as possible while Set working
A light source on
but No image
A light source
does not turn on
Driver connection check
Main b/d defect check
Main b/d defect check
“FAN”
Joystick LED
Works?
No
No
Yes
Adapter Power 19V
A Light Source
turned on?
No
Yes
Main b/d defect check
Main b/d defect check
FANx Error
(“x” is Fan No.)
High temp Error
Ambient Temp Err
SET Power On?
Driver B/D Defect Check
Main B/D defect check
2. Flow Chart for major symptom