Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung Plasma D72A chassis Troubleshooting
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download Troubleshooting documenatation <<
Text preview - extract from the document
Troubleshooting
6. Troubleshooting
6-1 First Checklist for Troubleshooting
1. Check the various cable connections first.
- Check to see if there is a burnt or damaged cable.
- Check to see if there is a disconnected cable connection or a connection is too loose.
- Check to see if the cables are connected according to the connection diagram.
2. Check the power input to the Video Board.
3. Check the voltage in and out between the SMPS Video Board, between the SMPS X, Y Drive Board, and between the
Logic Boards.
Samsung Electronics 6-1
Troubleshooting
6-2 Checkpoints by Error Mode
6-2-1 No Power
- The LEDs on the front panel do not work when connecting the power cord.
Symptom - The SMPS relay does not work when connecting the power cord.
- The power of the unit seems to be out of order.
The SMPS relay or the LEDs on the front panel do not work when connecting the power cord if the cables are improperly
connected or the Video Board or SMPS is out of order. In this case, check the following:
- Check the internal cable connection status inside the unit.
Major Checklist
- Check the fuses of each part.
- Check the output voltage of SMPS.
- Replace the Video Board.
Troubleshooting
Procedures Are the AC IN socket connector and No The AC IN socket connector and
the Main SMPS CN800 connected? the Main SMPS CN800 connected
Yes
Is the Fuse (F101) of the Main SMPS No
Power Input Part blown? Replace Fuse (F101)
Yes
Main SMPS CN804-2 No
Pin 3: STB 5V Replace the Main SMPS
Pin 5 PS-ON: Check to see if it is 0V
Yes
No
Replace the Main Board Replace the Digital Board
6-2 Samsung Electronics
Troubleshooting
6-2-2 When the unit is repeatedly turned on and off
Symptom - The SMPS relay is repeatedly turned on and off.
In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the
SMPS.
- Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage
Major Checklist output is correct.
- If the symptom continues even when SMPS is operated alone, replace the SMPS.
- If the symptom is not observed when operating the SMPS alone, find any defective ASSYs by connecting the cables one by
one.
Troubleshooting Does the symptom continue after Does the symptom continue when
No connecting the power after connecting
Procedures connecting the power and
the CN800 cable and removing the
Replace the
removing the CN800 cable from DC-DC SMPS
the Main SMPS? CN1, CN2, CN4 and CN6 cables from
the DC-DC SMPS?
Yes
Does the symptom continue after
connecting the power and Does the symptom continue when
connecting the power after removing Replace the
removing the CN800 cable from X Drive Board
the Main SMPS? the CN4 cable from the DC-DC SMPS?
Yes
Replace the Main SMPS
Does the symptom continue when
Replace the
connecting the power after removing
Y Drive Board
CN2 from the DC-DC SMPS?
Does the symptom continue when
Replace the
connecting the power after removing
Logic Drive Board
CN810 from the Main SMPS?
When separating and connecting the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of DC-DC
Caution SMPS, CN of the X Drive Board, and CN of the Y Drive Board, a spark may be generated by the electric charge of the high
capacity capacitor. Therefore, wait some time after separating the power cord from the unit.
Samsung Electronics 6-3
Troubleshooting
6-2-3 No Picture (When audio is normal)
Symptom - Audio is normal but no picture is displayed on the screen.
- This may happen when the Video Board is normal but the X, Y Drive Board, Logic Board, or Y Buffer Board is out of order.
Major Checklist - The output voltage of the Main SMPS or the DC-DC SMPS is out of order.
- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.
Are the Vs and Va voltages
normal after removing the CN809 No Replace the Main SMPS
cable from the Main SMPS?
Troubleshooting Yes
Procedures
Is the output voltage of the
DC-DC SMPS normal when No
reconnecting the CN809 cable Replace the DC-DC SMPS
and removing the CN1, CN2,
CN4 and CN6 cables from the
DC-DC SMPS?
Yes
Replace the Y Drive Board
Replace the X Drive Board
Replace the Logic Drive Board
Replace the Y Buffer Drive Board
When separating and connecting the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of the DC-DC
Caution SMPS, CN of the X Drive Board, and CN of the Y Drive Board, a spark may be generated by the electric charge of the high
capacity capacitor. Therefore, wait some time after separ ating the power cord from the unit.
6-4 Samsung Electronics
Troubleshooting
6-2-4 No Sound
Symptom - Video is normal but there is no sound.
- When the speaker connectors are disconnected or damaged.
- When the sound processing part of the Video Board is out of order.
Major Checklist
- Speaker defect.
- When setting the volume to 0 (Nonsense).
Is the cable connection between
No Connect the cable properly or
the Video Board and the
replace the cable, if necessary.
speaker properly connected?
Troubleshooting
Procedures Yes
Is the speaker output terminal No
of the Main Board normal? Replace the DC-DC SMPS
Yes
Replace the Y Drive Board
Replace the X Drive Board
Replace the Logic Drive Board
Replace the Y Buffer Drive Board
Samsung Electronics 6-5
Troubleshooting
6-3 Trouble-shooting with New Features
6-3-1 Installation & Connection
Problem Solution
The unit does not turn on when I
Check to see if the power cord is connected.
press the Power button on the
Confirm that the Device Selection of the remote control is set to TV.
remote control.
A normal broadcast is not Check to see if the antenna cable has been properly connected.
displayed.
Cable broadcasting does not
Install a satellite antenna (Parabola) and connect it to the TV.
work.
Satellite broadcasting does not
Subscribe to a local cable broadcasting firm and get support.
work.
6-3-2 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.
6-6 Samsung Electronics
Troubleshooting
6-3-3 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.
Adjust the screen brightness.
Only the screen is blank/it is dark If the screen is too dark, check to see if Power Saving Mode is set to "Super Power
or too bright. Saving". Although Super Power Saving Mode consumes less power than Standard Mode,
Super Power Saving Mode may have the screen dark.
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
Keep the video player as far away from the TV as possible.
screen when watching or
There is no picture on the screen
A video signal is only output through the Monitor OUT port when the current input mode is TV
when I have connected to another
(analog broadcast), External In or S-VIDEO.
device through the Monitor OUT
Check that the current mode is one of the above.
port.
A PDP TV uses a PDP panel consisting of 123million (SD Grade) ~ 315million (HD Grade)
Black or red spots appear on the pixels. Although a PDP panel is a product that requires high technologies to integrate a few
screen. million pixels, a bright or dark pixel may exist on the panel, this does not affect the perfor-
mance of the product.
Displaying a still picture on the screen may permanently damage the PDP panel.
A boundary may appear due to the difference in the transparency of the panel when
A boundary appears on the watching the picture in the 4:3 aspect ratio for a long time and the picture in the left, right
screen. and center screens is a still image.
A boundary may appear when watching a still picture from a DVD player or a video game
console on the screen for a long time.
Due to the nature of PDP TVs, partial after-images may appear if a still picture is displayed
An after-image remains on the for a certain period of time after connecting a video game console or a computer.
screen. This is caused by brightness deterioration due to the storage effect of the panel, and to
prevent this from happening, we recommend you reduce 'brightness' and 'contrast'.
Samsung Electronics 6-7
Troubleshooting
6-3-4 Sound
Problem Solution
Increase the volume.
Press the Mute button.
There may be no sound when the internal amplifier setting is set to Off.
There is no sound. Set the Internal Amplifier Setting to On.
If you have connected the DVI signal to HDMI IN using the DVI HDMI converter cable,
you have to connect an additional audio (L/R) cable to the DVI Audio IN port to hear
audio.
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.
This sound may be heard when the product chassis shrinks or expands due to the surround-
A "snapping" sound is emitted
ing humidity or temperature change.
from the product.
This sound does not indicate a problem and there is no need to worry.
A PDP TV may produce sound at a certain level when operating the fan to cool its internal
temperature. In addition, since the high-speed switching circuit and the high current may pro-
There is noise from the product.
duce noise depending on the screen brightness change, a PDP TV produces more noise than
a conventional CRT TV.
6-3-5 Channel
Problem Solution
Check if the antenna is properly installed.
There are no channels available.
Press the Auto Channel button to store channels.
Adjust the position, angle or direction of the antenna.
Some channels are not available.
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.
6-3-6 PC
Problem Solution
I cannot change the resolution. Update the driver of the graphics card with the latest version.
Letters are not properly displayed. Set the resolution lower than the current one. (e.g. 1024◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo