Samsung 2012 LCD LED TV training course

CONTENTS
2012 LED Hybrid TV & LCD TV -------------------------------------- 2
Preparation for Service ------------------------------------------------------ 5
IP SMPS Power Board ------------------------------------------------------ 11
Main Board 2012 LED Hybrid & LCD Models ------------------------- 20
T-CON Board ----------------------------------------------------------------- 24
Factory Test Mode ----------------------------------------------------------- 27
2012 LED Hybrid Front Cover Disassembly ----------------------------- 32
2012 Jog Function Control -------------------------------------------------- 35

2012 LED TV ----------------------------------------------------------------- 39
Disassembly Repair Preparation UN**ES8000 -------------------------- 43
SMPS Board ------------------------------------------------------------------- 50
Main Board 2012 LED TVs ------------------------------------------------- 60
T-CON Board ------------------------------------------------------------------ 69
2012 moIP (Camera/MIC) Module ----------------------------------------- 82


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2


The UN EH 4000 & 5000 Series includes The new Jog Function Control with a built in
Power/IR Indicator & Remote Control Sensor for these models

3


Rear View

4


5


NOTE: It’s really important to first disconnect the function Assy Cable by removing the
cover jack with one screw and then disconnecting the cable. Taking the rear cover off
without doing so has resulted in damage to the function Assy and cable connection.

6


Pictured on right is an actual damaged PC Connector from not first removing the Jog
Function connector before removing the back panel.

7

The Layout for the UN EH TV Models include the Main Board & IP/SMPS Board shown here
with its two important connectors going to the Main Board and Back Light LEDS. The T-CON
Board is now part of the panel assembly pictured on the bottom left.

8


The LED Hybrid Models utilizes LED Direct Backlight placed in similar Backlight horizontal
rear panel position as the CCFL LCD Backlights this makes the panel to have a thicker rear
section as compared to Slim LED with edge lit LEDs..….
- LCD panels are made up of rows and columns of red green and blue sub pixels. The TCON
board selects the specific sub pixel (each LCD) and controls the amount of light produced
for that area.
-The panel resolution determines the number of pixels. For example a 720P panel has 1280
horizontal pixels and 768 vertical rows. A 1080P panel has 1920 horizontal pixels and 1080
rows. Obviously the higher resolution requires that many more control lines.
-The video data signal outputs from the Main Board thru an LVDS Cable to the FRC/TCON
Board.
- The TCON Board provides the Row and Column Drive to the LCDs in time with the Scan
Signal.
- The Main Board supplies PS ON & BL ON signals to the SMPS Board which turns on the
LED Backlight while providing supply voltages to the other Board Assemblies.

9


A sample of the Wiring Diagram is shown here… The Main Board connector 201 to the IP or
SMPS Board. The ip Board to the LEDs on the Panel… The Main Board to the Jog
Function/IR/LED ASSY… the Main Board to the Speakers and also through the LVDS Cable to

the T-Con Board now part of the panel.

10


11


12


The power on sequence is shown:
-The 5V standby is supplied to the Main Board from the power supply
- The Power On/Off command is sent from the Main Board to the Power Supply via CN 80314 in this example providing 0V to 3.5V when activated.
-The Power Supply then provides all low voltages. The former Booting Melody is triggered
for this model.
-- The Main Board sends Blu ON -Back Light On command to the Power Supply 0V to 4,9V
after approx a 5 sec delay.

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-The Main Board also supplies a PWM Back Light Dim Control Command to the Power
Supply .5V to 4.0V DC effective that can be measures as the dim changes from a 0 setting
to a 20 auto or user setting for back light control.
- Finally the Power Supply sends two D1 Dim Control output signals to the LEDS. D1
negative changing from 1.3V to 32.8V effective DC voltage while the D positive stays fixed
at approx 110V .

14

The 2012 LCD Layout & Circuitry is very similar to 2011 LCD Models & includes: Main
Board; SMPS (Switching Mode Power Supply) Board/IP (Inverter Power) Board; IP Buffer
Board; T-Con Board; L&R Speakers

15


Typical wiring Diagram of the 2011 LCD Models and now 2012 is shown. The Main Board
again providing Power ON to the IP Power Supply Board after receiving it’s command from
the Function/IR Assembly. The Power Supply in turn providing Supply Voltages to the Main
Board and IP Buffer Board for Back Light CCFL Control Operation. The Main Board also
providing Digital Video Data Signal to the T-CON Board via the LVDS Cable and also audio
to the speakers.

16


Typical to the 2011 and 2012 is the LCD’s Power ON Sequence that begins at the Power
Supply Connection to/from the Main Board. The 5V standby is first supplied to the Main
Board & can be seen on pin 12 “A5V” (always 5V);
PS_On from the Main Board is sent to the Power supply changing from 0V to 3.5V. The
Back Light on command BLU_ON from the Main to the supply on pin 6, 0V to 5V; The Main
Boards Dim Control Signal, P_Dim found on Pin 2 will range from .5V to 1.5V depending on
Back Light Dimming.. and finally switched voltages “B5V” & “B13V” can be found on their
associated pins

17

Drive Signals between the LCD Power Supply and IP Buffer Board are now seen here.
In this example High and Low Pin Drive Voltages are found on
-“Pin 1 and Pin 3 … Be extra careful when troubleshooting since these voltages can run very
high, up to 4000V P-P in some previous models, in order to drive the CCFLs
-The 0VP protection and CCFL Power operation verification on pin 9 will change from near
0v DC when back light is lowest dim to .1V at max bright.
-13V should be measured at “VCC” Pin 11 as well as at Pin 10. 12 V should be measured at
LD pin 12 when troubleshooting.

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19


20


The 2012 LED Hybrid Main Board Layout is shown here. New for 2012 is the MSTAR X9
Processor…
2 HDMI and USB connectors on the upper left, Monitor & Optical Out are seen near
bottom center, as well as component & Composite connectors at center and Power Supply
connection CN201 and LVDS Connector on the upper right

21


Main Board Diagram includes the SEMS23 (MSTAR X9)
Processor. A one chip design, it receives and processes the Tuner, Audio, HDMI and other

input signals just discussed. It also receives IR. Keyboard and other info for processing and
control and outputs the final 10Bit Video Data Signal to the FRC/T-CON Board which in turn
controls the Panel LCDs. A troubleshooting note is the return of the “Melody” heard during
start up and only used for this series.

22


The LCD’s SEMS20 Mstar X5 Processor is the same used for 2011 LCD and is also a one chip
design and processes similar to the X9 discussed. A troubleshooting note is the On Screen
Booting Logo that is used during start up with no melody introduced in 2011.

23