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LG 50UL3G User manual

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Copyright 2025 Manuals.Online. All Rights Reserved.

CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2020 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.
P/NO : MFL71500378 (2006-REV00)
50UL3G 50UL3G-BJ
UW92J
LG Digital Signage
- 2 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
CONTENTS
CONTENTS .............................................................................................. 2
PRECAUTION........................................................................................... 3
SERVICING PRECAUTIONS.................................................................... 5
SPECIFICATION ....................................................................................... 7
SOFTWARE UPDATE............................................................................. 11
BLOCK DIAGRAM.................................................................................. 12
EXPLODED VIEW .................................................................................. 13
TROUBLE SHOOTING GUIDE ................................................ APPENDIX
- 3 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
WARNINGFORTHESAFETy-RELATEDCOMPONENT.
        
  These parts are
marked on the Exploded View. It is essential that
these critical parts should be replaced with the
      

        
       
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
 


         
screen.
           
          




through wrist band.
          


    

           


WARNING


      

         
         

Leakage Current Hot Check Circuit
PRECAUTION
1.5 Kohm/10W
0.15µF
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
CAUTION


- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Replaceable batteries
CAUTION


     





håndtering.


Levér det brugte batteri tilbage til leverandøren.


de la batterie.







Batterie
Entsorgung gebrauchter Batterien nach Anleitung
- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
       
         

       

         


    

      


other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
       
       


       

 
            

        
 
    


 
 



          

correctly installed.
7. Always connect the test receiver ground lead to the receiver
       
lead.
 
          

        
heat sink in this receiver.

  
       
       

     
         

      
     
charge on your body by touching a known earth ground.
      
        
prevent potential shock reasons prior to applying power to the
unit under test.
       
         
       


devices.
 
       

       

         
         
       
       

       

    
installed.
 

     
       

        


1. Use a grounded-tip, low-wattage soldering iron and appropriate
       






 


 

        

        


         

b. First, hold the soldering iron tip and solder the strand against

            

         

        

       

SERVICING PRECAUTIONS
- 6 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
- 7 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SPECIFICATION
1. Application range

2. General Specication
No.   
1 Input    







-
tion

 
  


 
8/10/12bits

  
-
tion

 
  


 
8/10/12bits

  
-
tion

 
  


 
8/10/12bits

  2.0
  2.0
 


IR/Brightness

 Inner IR
IR Receiver
Brightness sensor CM3232
LAN 

-


- 8 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No   
2 Output   Built-in * Measured conditon




 
 
Output Power 
Audio Out Output type  
Output level 
 󰀨
  
3
Feature
 MM3286CFBE : 85 °C Protection Main Board-in
  802.11ac, 802.11n 
 
Beacon
-
able

4 Video
signal
Operating Fre-

  󰀨
All Inputs
 

 
 
 
5  LG Code
-

 
-
tivity, L/R
 
6 󰀨 
7   

8 
 Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No   
Min  
  8 sec
10  󰀨
3s
11  30,000 50,000 
12  340 425 
13 Environ-

Condition
 040 deg 
 10 80  
 -20 60 deg 
 5 85  
14  Voltage(2 port) 2500Vac or 3540Vdc/1sec
Current  
15  - °(degree) -
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Supporting Resolution (Signal Timing)
No.  Pol. 
Clock




Cycle
(E)

(A)
Front
Porch(B)


Back
Porch(F)
Resolution 
1  40  1056 800 40 128 88  All inputs
V(Lines) 60.317 628 600 1 4 23
2 - 65 48.363 1344 1024 24 136 160 
V(Lines) - 60 806 768 3 6 
3  74.5 44.772 1664 1280 64 128  
V(Lines)   748 720 3 5 20
4  108  1688 1280 48 112 248 
V(Lines) 60.02 1066 1024 1 3 38
5 - 146.25  2240 1680 104 176 280 
V(Lines)    1050 3 6 30
6  148.5 67.5 2200  88 44 88 
V(Lines) 60 1125 1080 4 5 46
7   67.5 4400 3840 176 88   
V(Lines) 30 2250 2160 8 10 72
8   135 4400 3840 176 88   
V(Lines) 60 2250 2160 8 10 72
3.1. HDMI(PC Mode)
No.    Resolution 
1 31.5 60  480/60P O
2 31.25 50  576/50P O
3 37.5 50  720/50P O
4 45 60  720/60P O
5 28.1 50  1080/50i O
6 33.75 60  1080/60i O
7 56.25 50  1080/50P O
8 67.432   1080/60P O
67.5 60  1080/60P O
10 67.5 30  2160/30P 
11 112.5 50  2160/50P 
12 135 60  2160/60P 
3.2. HDMI (DTV Mode)