CS29B850 F18XSV Samsung color TV troubleshooting, SMPS and deflection schematic, service mode adjustments
Samsung CS29B850F18XSV Chassis: KSDB(P)-CB1M – 29 inch CRT color
TV
Basic Troubleshooting: Diagnosis of LED on the Front Panel
Light
is On: This happens when the Master Switch is not pressed or the power cord is
disconnected.
Light
is Blinking: This happens when the power cord is disconnected.
Light
is Off: The LED blinks, while the unit is starting up or the unit is turning
off.
Troubleshooting
by the Checksum
Diagnosis of
trouble by the checksum is neither reliable nor convenient.
You can only use the checksum 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 > Enter > Output Checksum (e.g. 0xab2b)
Checksum ExampleT-UR2PEANS-0001 checksum=2A0B
No Power troubleshooting procedure
No Sound Troubleshooting procedure
No Picture Troubleshooting procedure
Tuner Diagnosis
If there is no signal measured even though the RF signal received by the external antenna is input to the Main Board Tuner.
- Supplied Power: 5V, 8V, 33V
- RF Trouble Check: Check CVBS output
- AUDIO Trouble Check: Check SiF Signal output.
If there is no signal measured even though the RF signal received by the external antenna is input to the Main Board Tuner.
- Supplied Power: 5V, 8V, 33V
- RF Trouble Check: Check CVBS output
- AUDIO Trouble Check: Check SiF Signal output.
General Adjustment :
In general, a color TV can provide ideal visual quality by adjusting the basic settings such as the vertical size, horizontal size, focus, etc.
Display a black and white picture on the screen to check if the picture is clearly displayed.
If there are some ‘spotted’ points on the screen when displaying a black and white picture, degauss the screen using the degauss coil. If the spotted points remain, re-adjust the purity and the convergence.
This completes the basic performance examination.
In general, a color TV can provide ideal visual quality by adjusting the basic settings such as the vertical size, horizontal size, focus, etc.
Display a black and white picture on the screen to check if the picture is clearly displayed.
If there are some ‘spotted’ points on the screen when displaying a black and white picture, degauss the screen using the degauss coil. If the spotted points remain, re-adjust the purity and the convergence.
This completes the basic performance examination.
How to Access Service Mode
To enter Service Mode,
press the keys on the remote control according to the following sequence. (in
Stand-by status.)
To Enter: press “
Info > Menu > Mute > Power On” the entering service mode procedure is
the same as this for almost all Samsung TVs; including LCD TV.2. The initial screen of Service Mode.
3. Functions of the Keys within Service Mode.
Service Mode adjustments
MENU
|
Show
all menus
|
▲/▼
|
Move
the cursor to select an item.
|
◀/▶
|
Adjust
the selected configuration value
|
W/B Setting
No
|
Item
|
Data
|
Required
Adjustment
|
1
|
White
Balance
|
X:265+-5
y:265+-5 Y:32+-3
X:265+-5 y:265+-5 Y:1.6+-0.2 |
White
Balance (Standard Data)
|
2
|
Screen
Voltage
|
Toshiba
Pattern
|
Same
As S17A Chassis
|
G2
Adjust
|
Option1 XX
XX XX XX XX
Option2
Hotel Option
Deflection
Video Adjust 1
Video Adjust 2
Video Adjust 3
Video Adjust 4
YC Delay
Others
Option2
Hotel Option
Deflection
Video Adjust 1
Video Adjust 2
Video Adjust 3
Video Adjust 4
YC Delay
Others
Bus
Stop
|
Off
|
Checksum
G2 Adjust Reset |
0000
|
T-UR2PEANS-0001
Default Factory data settings
Service Adjustments
1. Adjusting the Picture Size
Since the K16C chassis includes a deflection adjustment of the Factory Data, adjustments must be performed according to the following procedures when replacing the Main Board.
1. Display the Lion pattern.
2. Press “Power Off > Info > Menu > Mute > Power On” using the remote control and enter Factory Mode.
1. Adjusting the Picture Size
Since the K16C chassis includes a deflection adjustment of the Factory Data, adjustments must be performed according to the following procedures when replacing the Main Board.
1. Display the Lion pattern.
2. Press “Power Off > Info > Menu > Mute > Power On” using the remote control and enter Factory Mode.
3.
Enter Deflection Mode.
4. Adjust the V-AMP, V-SHIFT, H-EW and H-SHIFT items so that the width becomes 92 and the height becomes 92.
4. Adjust the V-AMP, V-SHIFT, H-EW and H-SHIFT items so that the width becomes 92 and the height becomes 92.
Adjusting the Picture Straight Lines
1. Display the Cross Hatch pattern.
1. Display the Cross Hatch pattern.
2.
Adjust settings other than VSHIFT, H-EW and H-SHIFT, so that the straight lines
are displayed without curves.
3.
Adjust BOW and Angle settings wo that the center line becomes a straight line.
4.
Adjust the H-Parabola and H-Trapezium settings so that the left and right lines
become straight.
5.
Adjust the upper corner and the lower corner settings so that the end of the
lines become straight.
6.
Adjust the V-Linearity and V-SC settings so that the intervals of the
horizontal lines become uniform.
7.
When the adjustments are complete, display the Lion Pattern and check the
picture size not been changed. If there
is no change, finish adjustments.
Screen
voltage adjustment. Screen voltage adjustment is
critical to all CRT based TVs.
Adjusting the Screen Voltage
Select
: Power off > info > Menu > mute > Power ON
2. Initialise all settings to the values appropriate to the corresponding model
make sure the video adjust 1 is the factory date, just as the following picture.
3.
Select: Mute ,and get into the G2 adjust Toshiba pattern.
4.
First check IBRM in “G2 Adjust” of Factory and adjust Screen VR until
"Screen Adjust :OK", like the picture.
Adjusting the White Balance
1. Enter the factory mode [Service Mode] as
stated above.
2.
Initialize all settings to the values appropriate to the corresponding model.
3. Display the Toshiba pattern and adjust the White Balance using CA100 with the coordinates of the corresponding model.
3. Display the Toshiba pattern and adjust the White Balance using CA100 with the coordinates of the corresponding model.
5.
Enter Video Adjust1 of Service Mode. Adjust Low / Light.
- Adjust Sub Bright to set Y.
- Adjust B Cutoff to set y.
- Adjust R Cutoff to set x.
6. Enter Video Adjust1 of Service Mode. Adjust High/Light.
- Adjust Sub Contrast to set Y.
- Adjust B Drive to set y.
- Adjust R Drive to set x.
7. Check Low/Light and readjust it if its value has been changed.
8. If you have readjusted Low/Light, readjust High/Light until the two values are identical to the coordinates of the corresponding model.
- Adjust B Cutoff to set y.
- Adjust R Cutoff to set x.
6. Enter Video Adjust1 of Service Mode. Adjust High/Light.
- Adjust Sub Contrast to set Y.
- Adjust B Drive to set y.
- Adjust R Drive to set x.
7. Check Low/Light and readjust it if its value has been changed.
8. If you have readjusted Low/Light, readjust High/Light until the two values are identical to the coordinates of the corresponding model.
White Balance Standard Data
Check List for the Screen Voltage and White Balance Adjustment
1. The Screen Voltage and White Balance are connected to each other, and both of them have to be configured to the correct values.
2. Adjust the White Balance after the Screen Voltage was adjusted, and check if the Screen Voltage is normal after adjusting the White Balance.
3. If the White Balance is readjusted, check the Screen Voltage again.
4. When the adjustment is finished, check the following checklist.
If there is a spot on the screen when turning the TV set off/on, adjust the Screen Voltage again.
If there is a ghost line on the screen, adjust the Screen Voltage again.
1. The Screen Voltage and White Balance are connected to each other, and both of them have to be configured to the correct values.
2. Adjust the White Balance after the Screen Voltage was adjusted, and check if the Screen Voltage is normal after adjusting the White Balance.
3. If the White Balance is readjusted, check the Screen Voltage again.
4. When the adjustment is finished, check the following checklist.
If there is a spot on the screen when turning the TV set off/on, adjust the Screen Voltage again.
If there is a ghost line on the screen, adjust the Screen Voltage again.
Power supply [SMPS] and Deflection schematic
Syscon chroma schematic
