TROUBLESHOOTING -SERVICE MODE (Factory Mode) - REPAIR HELP - SAMSUNG UN40EH5000FXZA - LED LCD TV
Samsung LED LCD TV_UN40EH5000FXZA (UN**EH TV Start
Up Sequence) & T'CON Troubleshooting_Alignments {Universal Remote Control Codes for Samsung TVs}
Universal Remote Control Codes for Samsung TVs: 0030 0049 0050 0066 0076 0101 0102 0119 0143 0152 0154 0166
0181 0195 0209 0217 0240 0307 0318 0365 0379 0414 0421 0488 0492 0601 0624 0637
0642 0827
START-UP SEQUENCE
Sequence
|
Location
|
DC Voltage
|
5V STBY to Main Board
|
CN803-12 (A5V)
|
5V
|
Power On/Off From Main Board
|
CN803-14(Power On/Off)
|
0V-3.5V
|
Low
Volts On to
Main Board with Booting
Melody (X9 MStar)
|
CN803-1,3,5,7 (B13V)
CN803- 11,13 (B5)
|
13V
5V
|
Back Light On/Off From Main Boar
|
CN803-6
BLU On/Off
|
0V – 4.9V 5
Sec Dly
|
Back Light Dim Control
from Main Board 0
to 20 Backlight.
|
CN803 – 2 (PWM_DIMM)
effective DC Voltage is max
when backlight max.
|
0.5V – 4.0V (effective)
Dark to Bright
|
Dim
Control Out from IP SMPS to LEDs D1 –
is max voltage when backlight is min.
|
CNL802-1 & 2 (D1 -) C NL802-4 & 5 (D1+) D1 + stays constant
DC voltage.
|
1.3V-32.8V 110.8V.
|
Function Control Troubleshooting.
* Standby A3.3V on Function
Connector, Pin -3.
* All Pins should read 3.3V before
commands.
Function Control Troubleshooting
* Press, at Key 1, Pin 6. 3.3V to
0.0V DC
* Left, Right, Up, Down at Key 2,
Pin 7. Check specific voltages on chart.
UNEH4000 SAMPLE
TROUBLESHOOTING VIDEO PROBLEMS
Verify Video Operation (2012
Models)
a. Boot Logo models with X10
Micro-Processor & above during power on. Boot Sound only (X9 MPU) during
power on.
b. Customer Picture Test in user menu
c. “Display” (If display and Boot Logo & Customer
Picture Test are OK the source or cables are first suspected . Then check for a
defective input on the Main Board.)
d. Substitute with known good
Source (external DVD or Signal Generator to check.)
Using Test Patterns in Factory
Mode
ENTER FACTORY MODE
Select an active source signal since Test
Pattern may rely on signal source to appear or select TV Source mode.
With Customer Remote.
# Power Standby
# Mute, 182, Power ON
# Select SVC
# Select Test Patterns.
With Service Remote
* Power On
* Info, Test
T'Con TROUBLESHGOOTING
FAILURE EXAMPLES
> If Picture & Display errors
Defective Main Board, LVDS, or T-Con
> Green lines or a green screen
defective main board , LVDS , or T-CON
Pixelization can be caused by the
main board but is more commonly a source error.
Vertical or Horizontal Lines
:Defective Panel likely but also T-CON, LVDS, or Main Board. Use Test Patterns
in Factory Service Mode to determine error)
ALIGNMENTS
Check/Set Option Bytes: in
Factory Mode. (Must be performed after replacing Main Board.)
Service Mode [Factory Mode]
Standard Remote
1. Power OFF the TV
2. Press MUTE, 1 8 2, then POWER.
Factory remote
1. Power the TV ON
2. Press INFO then FACTORY
> Check/Perform latest Firmware
Upgrade for all repairs.
> Perform reset in Service Mode if
Main board is replaced.
Note: Inform customer of reset of
all Settings if Main Board is replaced.
Option Bytes settings for
UN40EH5000.
2012
LED Hybrid Disassembly cautions for Front Cover
To prevent the removal process
from damaging the connections on the sides of the panel.
* Place TV faces up on cushioned
table.
* Cut and split the cover off at
the top.
* Carefully remove the Front Cover
and insulated paper in Front of T-Con area.
* Attach the Front Cover bottom
first to the panel.
* Secure the plastic latch on the
left and right side of the Front Cover as shown.
* Visually inspect the spacing
between the Cover and the panel for equal clearance
* Combine to stick the Front Cover
Rib into the middle mold.
Panel front disassemble
