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Troubleshooting
6. Troubleshooting
6-1 Checkpoints by Error Mode
Power LED: Check that the LED works when turning the Master Switch ON/OFF
LED Indicators: See table 6-2-1 Basic Troubleshooting: LED Diagnosis on the Front Panel.
In case of a power failure or abnormal screen, check the following items.
1) Check that the power cord is correctly connected to a 220V wall outlet.
2) Check that the Master Switch has been pressed.
3) Check that the transmitter is turned on.
4) Check that transmitter device selection is set to TV.
5) Check that the signal cable is properly connected.
6) Check that channel setting has been set.
Samsung Electronics 6-1
Troubleshooting
6-1-1 Basic Approaches for Troubleshooting
Troubleshooting Mechanism :
- The Main Board has Power part which supplies power to Deflection and Feature Box.
- The Feature Box receives all signal inputs,the signal-processed signal is sent to CRT Ass'y.
- Deflection and Focus are controlled by the Main Board.
Troubleshooting by Modules
1) Enter Service Mode
(In SET Stand-By Status,if you press "Info""Menu""Mute" and "Power" button in sequence on the remote control, the
screen is turned on and the Service Mode screen appears.)
2) Check if the Power part of the Main Board Board, which supplies power to Feature Box, is out of order.
If you cannot turn the screen on by pressing the POWER ON/OFF button or the screen repeatedly turns on and off when
pressing the POWER ON/Off button, check if the Power part of the Main Board is out of order. (Refer to the circuit diagram)
4) Check if the Deflection part of the Main Borad is out of order.
When the screen is not properly displayed and the left or right side of the picture is shrunk, or the top or bottom of the screen
is expanded or shrunk, check if the Deflection Board is out of order.
6-2 Samsung Electronics
Troubleshooting
6-1-2 Flow Chart for Malfunction
Does the TV work? YES
Is there Does the OSD
YES
somethi ng on menu on the
NO
the Screen screen work?
Is the power cord or the NO
master switch out of order ?
Check that the cables are properl y
NO
connected to Main Boar d.
Replace t he Feature Box, if necessary.
Is the cable connect ing
the Power Board and the
Def lection Board properly
connected?
NO
Is a CRT high voltage NO Replace the
been measured? Main Board
NO
Is the cable f rom the NO
Connect the cable
Main Board to t he CRT
Ass' y properly connected?
Samsung Electronics 6-3
Troubleshooting
6-2 Trouble-shooting with New Features
6-2-1 Installation & Connection
Problem Solution
The power does not turn on. Check if the power cord is properly connected.
Air broadcasting does not work. Check if the antenna is properly installed.
Cable broadcasting does not
Subscribe to a local cable broadcasting firm and get support.
work.
Satellite broadcasting does not
Install a satellite antenna (Parabola) and connect it to the TV.
work.
6-2-2 Menu & Remote Control
Problem Solution
Press the Select Device button to select the TV or external device.
Replace the battery of the remote control with a new one.
Insert the battery making sure the polarity (+,-) is correct.
Check if the angle or the distance is sufficient, or if there is any interference between the
The remote control does not
product and the remote control.
work.
Make sure the user has pressed the correct button.
To avoid direct sunlight to the receiving panel of the TV, remove any indoor lighting or
change the location of the TV.
Check if the power switch at the back left of the TV is turned on.
Cannot change the channel with Press the Select Device button to select the TV.
the remote control. Change the channel using the remote control of the cable or satellite receiver.
Press the TV/AV button and check if the AV item is grayed out. When the AV item is grayed
Cannot select an A/V channel.
out, you cannot select an A/V channel. Check if the connector is properly connected.
Cannot select a menu. Check if the menu is grayed out. If a menu is grayed out, it cannot be selected.
6-4 Samsung Electronics
Troubleshooting
6-2-3 Screen
Problem Solution
Check if the power cord is properly connected.
The screen is black and there is
Turn on the power.
no sound.
Select an AV channel that corresponds to the external device.
Only the screen is blank/it is dark
Adjust the screen brightness.
or too bright.
The screen is blue/the external Check if the connector is properly installed.
channel is not displayed. Select an AV channel that corresponds to the external device.
The screen overlaps Check if the antenna is properly installed.
(double/triple). Adjust the position, angle or direction of the antenna.
The screen is snowy or unclear.
Check if the antenna has been bent or moved by the wind.
The picture quality gets worse
Check the antenna for its lifetime. (Normally 3 - 5 years, 1-2 years near the coast)
when it is windy
Dotted or semi-dotted lines are
Install the antenna as far away from the road as possible.
displayed on the screen.
Adjust the color density.
The screen is black and white.
Check if the connector is properly installed.
The colors of the screen are
Adjust the color tones.
odd/strange.
Unusual lines appear on the
Keep the antenna away from the power cord or connectors if possible.
screen.
Unusual lines appear on the
screen when watching or Keep the video player as far away from the TV as possible.
recording to video.
6-2-4 Sound
Problem Solution
Increase the volume.
There is no sound.
Press the Mute button.
Increase the volume.
The sound is very low.
Set the auto volume control to ON.
There is a lot of noise. Keep the antenna away from the power cord or connectors if possible.
The selected language does not
Press the Multiplex button to select the TV.
appear.
Samsung Electronics 6-5
Troubleshooting
6-2-5 Channel
Problem Solution
Check if the antenna is properly installed.
There are no channels available. Press the Auto Channel button to store channels.
Contact your local broadcasting service station.
Adjust the position, angle or direction of the antenna.
Activate the Reception Sensitivity Boost feature.
Some channels are not available.
Contact your local broadcasting service station.
Use the number keys to select a specific channel and press Store/Clear to memorize it.
Only the UHF (14-69) channels
Check if the antenna is able to receive UHF signals.
are not available.
6-2-6 Others
Problem Solution
This noise may occur when the plastic material inside the TV expands or contracts according
The TV makes a noise as if
to the seasonal temperature or humidity. This is like the noise from a furniture/cabinet/sink
something is dropping inside.
unit, and there is no need for concern.
6-6 Samsung Electronics
Troubleshooting
6-3 Troubleshooting Procedures by Error Modes
6-3-1 Basic Troubleshooting: Diagnosis of LED on the Front Panel
: Light is On
: Light is Blinking
: Light is Off
Power Description
This happens when the Master Switch is not pressed or the power cord is disconnected.
This happens when the power cord is connected and the power switch is pressed.
If you cannot set the power switch on by pressing it, check the power switch Ass'y.
If you press the power switch of the transmitter or the channel key on the remote control when in
St-BY status, the screen will be turned on.
If the LED blinks and the screen is not displayed, check the connection between the Power and
the System Board.
6-3-2 Troubleshooting by the Checksum
Diagnosis of trouble by the checksum is neither reliable nor convenient.
You can only use the checksume of the current direct-view TV to determine whether the software is corrupted or not.
The Checksum value is determined according to the version of the software loaded on the set.
Therefore, you can determine whether the software has been properly downloaded, if you know the correct checksum for that
version of the software.
You can check the checksum according in the following order.
Factory Mode Checksum Right Button Calculate Checksum Output Checksum (e.g. 0xab2b)
Checksum Examples
T_ULTPEU_1002 : Checksum = 0x4faa
Samsung Electronics 6-7
Troubleshooting
6-4 Troubleshooting Procedures by ASS'Y
6-4-1 NO Power
1. Power part of the Main Board Check
No-Power
AC Voltage Impress
NG FP801S FUSE NG
IC801S #1 CHECK AC FUSE CHANGE
CHECK
OK
OK D801S
Change NG CHECK HOT BLOCK NG IC801S #4 CHECK NG
D801S CHECK BRIGE DIODE
Materials Materials DC : 16 ~ 24V
OK CHANGE
OK IC801S
STR IC CHANGE
F/back Line Check
Change NG C802(B+) Voltage check OVER NG FD801S/FD802S FUSE/ Change
135V F/B Line
Materials DC :135V Diode Check Materials
12V Line
OK or Low
L804 Open NG R817 Line NG Change
Change NG
HC401 H-OUT TR Cehck 12V Line
B+ check Check Materials
Materials
OK OK OK
F-Box Check
IC801S and Change the
Module
B+(132V) Line
F/BACK LINE CHECK NG Change
No-Power
PC801S/DZ801/Q803... Materials
Repair End
6-8 Samsung Electronics
Troubleshooting
6-4-2 NO Video
1. when the power is normal
No-Signal
EXT :No EXT :Ok
RF :Ok RF,VIDEO RF :No TU01 NG IC801 78R09
CEHCK 9V check CHANGE
Video:No OK
RF:No
TU01 NG IC803S 78R05
5V check CHANGE
NG SCART1/SCART2
OK
CVBS Check
OK
Cehck A/V TU01 NG DZ405 TZP33A
Cabile 33V check Change
OK
OPEN Tuer SDA/SCL
OPEN Tuer SDA/SCL TU01 SDA/SCL NG
OK PIN
PIN check NG
Check SCL/SDA
Check SCL/SDA
OK OK
NG
C117 CVBS NG
Tuner Change
CHECK
OK
F-Box Module
Change
Repair End
TU01
Samsung Electronics 6-9
Troubleshooting
6-4-3 No Sound
1. when the power is normal
No-Signal
EXT :No EXT :Ok
RF,EXT-IN RF :No TU01 NG IC801 78R09
RF :Ok
CEHCK 9V check CHANGE
EXT :No OK
RF :No
TU01 NG IC803S 78R05
5V check CHANGE
NG SCART1/SCART2
OK
CVBS Check
OK
TU01 NG DZ405 TZP33A
Cehck A/V
Cabile 33V check Change
OK
OPEN Tuer SDA/SCL PIN OK TU01 SDA/SCL NG OPEN Tuer SDA/SCL PIN
Check SCL/SDA check Check SCL/SDA
NG OK OK
Tuner Change
F-Box Module NG F-Box Module
R/L-OUT Check Change
OK
NG NG Change
AMP B+ Check FD801S CEHCK
Materials
OK OK
AMP CHANGE
6-10 Samsung Electronics
Troubleshooting
6-4-4 No Raster
1. when the H/V is normal
No-Raster
Raster IC501 B+ NG IC501 B+ Line Check and
Raster Check
CHECK Materials change
Black or
Horizetal line in OK
middle of screen IC501 Output NG
IC501 TDA6111Q change
Signal Check
OK
RGB Line Materials
Check and Change
Heater Line
Black FBT Screen VR MAX Black CRT ASSY
Fusible Resistor
And Screen check CHECK
change
Raster
OK Go to the No-Video check
OSD Check
Flow Chart
NG
hori FBT 16.5V/-16.5V
NG Line Diode and F-BOX Module
FBT 16.5/-16.5V Change
Fusible Resistor
CHECK
check and Change
OK
IC301 #4,#5 NG F-BOX Module
V-Sync Check Change
OK
Vertical Block NG F-BOX Module
Materials Check Change
OK
Verticla IC
LA7845 Change
Samsung Electronics 6-11
Troubleshooting
6-5 Troubleshooting by Blocks
6-5-1 Troubleshooting System Boards
1. Tuner Diagnosis
If no signal is received even though the RF signal from the external aerial is connected to the MAIN Board Tuner, check the
following items.
- Supply Power: 5V, 3.3V, 33V
- Check for an RF defect: Check the CVBS output
- Check for an AUDIO defect: Check the SiF Signal output
6-12 Samsung Electronics
Troubleshooting
2. External Input Diagnosis
It receives the EXT1/EXT2/signal and consists of monitor output (video and audio).
The signal is input to VSP9402 through the port. If no signal input/output is detected, check the following items.
- Power supply : VSP9402(3.3V,1.8V) , CXA2180(5V)
- Check if the input and output jacks are defective.
Samsung Electronics 6-13
Troubleshooting
3. TDA7297(Audio AMP) Diagnosis
The signal is received from the Audio Processor (VCT69xyP) and sound is output at 10W + 10W power.
- Power supply :15V
- Check for input defects : L/R
- Check for output defects : L+, L-, R+, R-
6-14 Samsung Electronics
Troubleshooting
4. VCT67xyG Diagnosis
It processes the one chip that Micom, Switching, Decoder
- Power supply : 8V, 5V, 3.3V, 1.8V
- Check for input defects : RF, SCL, SDA, S-Video(Y,C), SIF,
Scart 1/2, Component 1/2, HDMI
- Check for output defects : RF, Monitor out, R/G/B
Sound L/R
Samsung Electronics 6-15
Troubleshooting
5. CX2165 Diagnosis
The Y/Pb/Pr signal is received from VCT69xyP and the signal is output as
R/G/B. It also outputs the V/H Drive, E/W and performs the ABL and EHT
operation. If V-Drive output is not detected, check for an IC defect.
- Power supply : 5V, 9V
- Check for input defects : R/G/B, H/V
- Check for output defects :
6-16 Samsung Electronics
Troubleshooting
6. MST3383M Diagnosis
HDMI Decoder
- Power supply : 5V, 3.3V, 2.5V
- Check for input defects : SCL, SDA, Reset
- Check for output defects : HDMI 24bit Data, I2S, H/V
Samsung Electronics 6-17
MEMO
6-18 Samsung Electronics