SHARP LC-70UD1U - 2k/4k - SERVICE TRAINING –SERVICE MODE – LED BLINKING AND TROUBLE SHOOTING

SHARP LC-70UD1U - 2k/4k - SERVICE TRAINING –SERVICE MODE – LED BLINKING AND TROUBLE SHOOTING

SHARP LC-70UD1U  

LED LCD 4K UHD (20160p) 

120Hz ACTIVE 3D 

SMART TV

SERVICE TRAINING –SERVICE MODE AND – LED BLINKING AND TROUBLE SHOOTING 

What is 4K

The new 4K technology is now entering living rooms around the world.
• It is double the resolution of 2K technology, or 1920x1080 = 3840x2160.
• All signal is first up scaled to 1920x1080, enhanced, and then scaled to 3840x2160.
• Native signal at 3840x2160 is not up scaled or enhance.

Rear Cabinet Removal

The Rear Cabinet is removed with the set on it’s stand.
# Remove 3 short machine screws and lift off stand cover (green)
# Remove 28 machine screws (red).
#Remove 4 plastic screw (yellow).

Lift off Cord Cover Squeeze AC connector and remove cord.

Lift off Rear Cabinet,
Note: If set is totally dead when you arrive on site, please check AC cord first and be sure the it is locked in place.

# Here is a view with the rear Mcabinet removed.

Sub-Woofer Removal

# Remove 4 machine screws.
# Disconnect speaker wire.
# Lift off Sub-Woofer Ass’y
# This will give you access to the DRC/FRC and TCON section

PWB Layout

Connection Layout

Power Unit Operation

# The power unit is responsible for providing main and back-up power sources, including LED backlight drive.
# UR13 Volts = Unregulated 13 Volts / switched
# S13 Volts = Signal 13 Volts regulated / switched
# BU5 Volts = Back-Up 5 volts / unswitched (always supply)
# 12 Volts PNL= Panel Power 12 Volts / switched

Main Unit Operation

The main PWB is responsible for the following operations:
#HDMI Input Switching & Processing.
#HDMI 1 (*ARC) HDMI 4 (**MHL)
#Component and Composite Input terminals.
#USB Input Terminals
#A/V Switching.
#Analog, Cable and Digital Tuning (ATSC/QAM).
#Analog & Digital Audio Processing (SIF & SAP).
#Optical Digital Audio Output.
#CPU, EEPROM, & RS232 Operations.
#CAT 5 Internet connection.
#Monitor/SubMicon.
#Audio Amplifier.
* Audio Return Channel
** Mobile High Definition Link (for charging mobile devices.)

The Monitor/Sub Micon section is responsible for power supply and power detection.

# U+5V
# D+5V
# D+3.3V
# D+1.5V
# D+1.2V
# BU+3.3V
# Backlight error detection
# 12V panel power detection

U+5V and UR+13V from the power unit is applied to the main PWB to start up the set.

LED Drive Operation

# The LED drive unit is responsible for providingLED drive voltage for the edge lit display.

DRC/FRC/TCON Operation

# DRC: Dynamic Range Compression Receives LVDS from Main PWB which was converted to 2k when content is at a lower resolution then 1080.
# DRC enhances image before converting to 4K.
# 4 K resolution = 3,840 x 2,160, which is double from 1920x1080.
# DRC adds 3 pixels for every single pixel with 1080 I/P video sources.
# FRC converts the 60hz LVDS to 120Hz.
# 4 LCD drive signals lines directly output the LCD controller at 210MHz PPDS format, which drives the 10bit LCD panel.

Main Unit Removal

# Remove 8 cables
# Remove 8 chrome screws (red)
# Lift off Terminal Angle Side and Terminal Angle Bottom, lift out Main PWB.
# Please Note: At the time of publication, this model does not use MDL files for Main Unit set-up.
pic11

Main PWB Installation

Entering the adjustment process mode
1) Press and continue to hold the VOL DOWN & INPUT buttons while plugging in AC power.
2) Continue to hold the VOL DOWN & INPUT buttons until <K> appears on the top left side of the Display.

3) Press the VOL ˆ & Channel DOWN buttons until the 1/29 Service Menu screen appears.

4) Press Channel button on remote control and navigate to page 29/29.

5) Select Panel Limit and press left arrow on remote control to turn Panel Limit OFF.

6) Select Model Name and press “Volume +/-” on remote control to scroll through models numbers. Select UD1U for this set.

7) Press “Enter” on remote control. You will see “UD1U OK” to confirm your setting.

8) Select Panel Size and press “Volume +/-” on remote control to scroll through screen sizes and select “70” for this set.

9) Press “Enter” on remote control. You will see “70 OK OK” to confirm your setting.

10) Go back and return Panel Limit setting back to “ON”. This prevents the panel selection size from changing.

11) Complete the main PWB installation by running Industry INIT and finally, check and reset lamp errors.

# Page 1/29 will indicate if the set has experienced any lamp errors. The unit will shut down after 5 lamp errors or if an LED array is shorted.

# Note: This set has 1 lamp error, so the set will still operate normally.
# Please follow the next steps on how to reset lamp errors.

How to Perform Lamp Error Reset

1) Press DOWN key on remote control and navigate to page 2/29.

2) Press > Key on the remote control to change from off to on.

3) Press Enter Key on the remote control to reset lamp errors.

How to Perform Industry INIT

4) Press DOWN key on remote control and navigate to page 2/29.
5) Press > key on the remote control to change from off to on.

6) Press “Enter Key” on the remote control to start industry init process.

# Note:////// will appear during industry init process.

# Upon completion of initialization the screen will turn green with the message “INDUSTRY INT SUCCESS”.

 Exiting Service Menu

1. All changes are stored automatically upon input.
2. Disconnect AC power to exit the service menu.

Power Unit Removal

# Disconnect 4 cables.
# Remove 8 chrome screws and lift off the Power Unit.

DRC/FRC and TCON Removal

Before you can access the DRC/FRC and Tcon Units, you will need to remove the shield.
#Remove 6 black machine screws and lift off the shield.

# Disconnect 4 cables.

#Remove 12 chrome screws and lift off the DRC/FRC Unit.

TCON Unit Removal

#Disconnect 7 cables
#Remove 6 Chrome screws and lift off the LCD Control Unit.

LED Drive PWB Removal

# Disconnect 3 cables.
#Remove 8 black screws and lift off the LED Drive PWB.

Performing Software Upgrade

1. Unplug the AC cord
2. Insert the USB Memory Device with the Main Software Upgrade into the side terminal
3. Plug in the AC cord while holding down power button on the unit for ~5 seconds
4. After the unit powers up a screen will be displayed showing the upgrade progress as in Figure 1
5. Once the upgrade is complete the screen will display an “UPGRADE SUCCESS” message. as in Figure 2

Upgrade Failure

# In the event the upgrade fails an
“UPGRADE FAILURE” message will be displayed.
# In this event of an Upgrade Failure please try to perform upgrade again.
# If the upgrade fails after multiple attempts verify that the USB Memory Device only has 1 software file update on it. The USB Memory Device will have 2 files if a monitor update is required.

Troubleshooting 

Flashing Power / Timer LED

In most of our past models a faulty, loose, or disconnected LVDS cable can lead to errors, such as “Power Icon” 2 slow and 5 fast, or 2 “Power”, 5 “OPC”, etc. However, LC70UD1U will behave in the following manner.
# No error Blink Codes.
# Black screen, no backlights.
# Relay click ~ 15 seconds and set powers down.
# Monitor Error 02 will be stored in the service menu.

Troubleshooting  Flashing Power / Timer LED

Troubleshooting LED Backlight Failure

# If the Power and Timer LED’s indicate lamp errors, try the following troubleshooting methods.
# Force the set on using Ch DOWN Vol UP while plugging in ac power cord.
# If the set turns on, look for backlight illumination.
# If set does not turn on, Remove L1 and L2 independently, and force-on. If unit turns on the LED backlight is most likely at fault.

Note: The set will run for ~ 10 seconds With L1 or L2 disconnected. Then the set will shut down. This will prove a bad LED strip inside the LCD panel.

Troubleshooting LCD Panel

# LCD Test Pattern bypasses the Main PWB. The test pattern is generated from the LCD controller and a applied directly to the LCD panel
1. Navigate to page 18/29 of the Service Menu.
2. Press “>” button on the remote control to enter the LCD TEST PATTERNS

# The TV test pattern is generated on the Main PWB and applies the test
pattern to the LCD Controller.
1. Press the “Volume –” button on the remote control to scroll through test patterns