Samsung LT17N23W User manual

TFT-LCD TV/MONITOR
Chassis Model
VR17JO LT17N23W
Manual
SERVICE
TFT-LCD TV/MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Layout
11. Schematic Diagrams
12. Panel Description

LT17N23W 9-1
NC NC NC NC TXOUT3+
TXOUT3- GND GND TXOUT2+ TXOUT2-
TXOUT1+ TXOUT1- TXOUT0+ TXOUT0- GND
GND TXOUT3+ TXOUT3- TXCLKOUT+ TXCLKOUT-
GND
ADJ_BRIGHTNESS
GND
AGASW_INVERTER
GND
GND
NC
GND
GND
14_INVERTER
14_INVERTER
14_INVERTER
14_INVERTER
14_INVERTER
14_INVERTER
LED_GRN
LED RED
NC
A3.3V
IR
GND
GND
COMP1_CR
NC
GND
COMP1_CB
NC
GND
COMP1_Y
NC
14V_INVERTER
GND
14V_INVERTER
NC
GND
COMP1_L
GND
D4_L
GND
NC
GND
COMP1_R
GND
D4_R
GND
PC_RED
PC_GREEN
PC_BLUE
GND GND GND
GND
GND
PC_5V
IDENT_PC
GND
DDC_TXO
H_SYNC
DDC_RXO
V_SYNC
CN804
CN805
KEY1
POWER_KEY
CH+_OUT
CH-_OUT
NC
GND
CN806
CN505
CN807
CN802 CN803CN601
TUNER
CN809
SPKOUTR+
NC
SPKOUTR-
CN702
SPKOUTL+
SPKOUTL-
CN701CN808
D4_Y
GND
D4_PB
GND
D4_PR
GND
NC
D4_L1 D4_L2
NC
D4_L3
GND
NC
D4_ID
CN801
GND
IDENT_HP
GND
HP_L
HP_R
GND
PC_AUDIO_L
PC_AUDIO_R
GND
SVHS_C
SVHS_Y
VIDEO_CVBS
GND
VIDEO_L
VIDEO_R
9 Wiring Diagram

LT17N23W 5-1
5 Troubleshooting
5-1 No Power
Does proper DC 14V at C602? Check adapter for 14V and 4.5A.
Yes
No
Does proper DC 5V
appear at L601?
Change IC601 or main ass’y.
(BN91-00716A)
Yes
No
Does each proper DC1.8V, 3.3V
appear at L604, L605?
Change IC610 or main ass’y.
(BN91-00716A)
Yes
No
Does each proper DC 5V
appear at L603?
Change IC602 or main ass’y.
(BN91-00716A)
Yes
No
Does each proper DC 3.3V, 33V
appear at C618, C621?
Change IC603/IC604 or
main ass’y. (BN91-00716A)
Yes
No
Does proper DC 14V
appear at C628?
Change IC605 or main ass’y.
(BN91-00716A)
Yes
No
Does each proper DC 8V, 9V_1
appear at C635, C638?
Check IC607/IC608 and
related circuit.
Yes
No
Replace the board with new one.
1-1
1-2
1-3
1-4
1-5
1-6
1-7

5 Troubleshooting
5-2 LT17N23W
WAVEFORMS
1-1 1-2
1-3 1-4

WAVEFORMS
1-5 1-6
1-7
5 Troubleshooting
LT17N23W 5-3

5 Troubleshooting
5-4 LT17N23W
5-2 No PC Signal
Does the signal R, G, B,
H, V appear at C122/C119/
C124/C164/C165?
Check IC102 or D-SUB signal cable.
Yes
No
Does the signal appear at
RA101~RA107?
Change IC101 or main ass’y.
(BN91-00716A)
A
Yes
No
Does the signal appear at
RA514~RA519?
Change main ass’y.
(BN91-00716A)
Yes
No
Does the signal appear at X501? Change X501 or main ass’y.
(BN91-00716A)
Yes
No
Yes
Power indicator is green.
Replace the LCD_panel
with new one.
2-1
2-2
2-3
2-4
2-5

5 Troubleshooting
LT17N23W 5-5
WAVEFORMS
2-1 2-2
2-3
2-5
2-4

5 Troubleshooting
5-6 LT17N23W
5-3-1 No Video (Tuner, AV CVBS, S-Video)
Does the signal appear at
C237 (TV), C230 (AV),
C229 (SVHS_Y), C228 (SVHS_C)
Change CN809 or replace
SUB_board with new one.
Yes
No
Does the signal appear at
RA201~RA204?
Change IC305 or replace main board
with new one.
Yes
No
Does the signal appear at X201? Change X201 or replace main
board with new one.
Yes
No
3-1
3-3
3-2
3-4
3-5
5-3-2 No Video (Component 1, D Connector Input [408i, 480p, 720p, 1080i])
Does the signal appear at
C136, C137, C140 (Y, Pb, Pr)?
Change IC103, CN802 or replace
main board with new one.
Yes
No
3-7
3-9
3-8
3-6
Repeat ‘A’ process.
Repeat ‘A’ process.

5 Troubleshooting
LT17N23W 5-7
WAVEFORMS
3-1 3-2
3-3 3-4
3-5

5 Troubleshooting
5-8 LT17N23W
WAVEFORMS
3-6 3-7
3-8 3-9

5 Troubleshooting
LT17N23W 5-9
5-4 No Sound
Does the signal appear at
C749/C750 (PC), C751/C752 (AV),
C753/C754 (D connector input),
C755/C766 (comp1)?
Change IC703 or replace main
board with new one.
Yes
No
Does the signal appear at
C701/C704 (Sound_R),
C724/C725 (Sound_L)?
Change IC701 or
replace cable with new one.
Yes
No
4-1
4-2
Replace R/L speaker with new one.
WAVEFORMS
4-1 4-2

LT17N23W 4-1
4 Alignments and Adjustments
4-1 General Alignment Instuction
1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.
2. Use the specified test equipment or its equivalent.
3. Correct impedance matching is essential.
4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers,do not allow the marker generator to distort
test result.
5. Connect the TV only to an DC power source with voltage and frequency as specified on
the backcover nameplate.
6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure
that the power cord is disconnected before replacing any parts.
7. To protect aganist shock hazard,use an isolation transform.

4 Alignments and Adjustments
4-2 LT17N23W
4-2 Factory Mode Adjustments
4-2-1 Entering Factory Mode
1. To enter “Service Mode” Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
- If you have Factory remote - control
4-2-2 Factory Mode Tree

4 Alignments and Adjustments
LT17N23W 4-3

4 Alignments and Adjustments
4-4 LT17N23W

4 Alignments and Adjustments
LT17N23W 4-5
4-3 White Balance Adjustment
1. In factory mode (1, 3, 6), you can adjust the white balance.
2. As the adjustment and data values differ depending on input sources, different adjustments are
requried for RF, DTV (Component 1, D4) and PC modes.
3. Optimum condition data for each mode are saved as default values. (Refer to Table 2, 3)
4. As the RF mode is applied with the same vlaues as for VIDEO and S-VIDEO, adjustment can be
made in any of RF, VIDEO and S-VIDEO modes.
Table 4-1. White Balance Setting Conditions
Table 4-2. Color Control Default Vlaue
Table 4-3. Color Control Default Vlaue

4-3-1 Conditions for Measurement
1. On the basis of toshiba ABL pattern : High Light level (57 IRE)
- INPUT SIGNAL GENERATOR : MSPG-925LTH
2. Optical measuring device : CA210 (FL)
4-3-2 Method of Adjustment
1. Adjust the basic level of DTV and PC input signals.
a) Set the input to the mode in which the adjustment will be made (DTV PC).
* Input signal - DTV Mode : Model #6 (1280*720 Mode), Pattern #36
- PC Mode : Model #21 (1024*768 Mode), Pattern #16 (Picture 4-1)
b) Enter factory Calibration, confirm the ADC data (DTV, PC Mode Only).
* ADC default value : Table 4-3.
2. Adjust the white balance of RF, DTV and PC Modes.
a) Set the input to the mode in which the adjustment will be made (RF DTV PC).
* Input signal - VIDEO Mode : Model #1 (750*480 Mode), Pattern #16
- DTV Mode : Model #6 (1280*720 Mode), Pattern #16
- PC Mode : Model #21 (1024*768 Mode), Pattern #16
b) Enter factory color control, confirm the data.
4 Alignments and Adjustments
4-6 LT17N23W
Picture 4-1 Toshiba ABL Pattern

c) Adjust the low light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust sub - Brightness to set the 'Y' value.
- Adjust red offset ('x') and blue offset ('y') to the color coordinates.
* The green offset is fixed to the default and is not adjusted.
d) Adjust the high light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust red gain ('x') and blue gain ('y') to the color coordinates.
* The green gain and sub - Contrast ('Y') are fixed to the default and are not adjusted.
4 Alignments and Adjustments
LT17N23W 4-7
Picture 4-2 Toshiba ABL Pattern
Picture 4-3 Toshiba ABL Pattern
4-3-3 Option Table
Low light
Measurement point
High light
Measurement point

4 Alignments and Adjustments
4-8 LT17N23W
4-3-4 PW565
* The PW565 output data are fixed to the default and are not adjusted.
4-3-5 VPC 3230-MAIN
* The Data are fixed to the default and are not adjusted.

4 Alignments and Adjustments
LT17N23W 4-9
4-3-6 ADC
*Adjust the R(Pr), G(Y), B(Pb) gain and offset to the basic level of DTV and PC input signals.
4-3-7 Test Pattern
* It is only displayed to a signal of the PW565 data.
1) Luma Ramp (16 step)
2) Luma Ramp (128 Step)
3) White 16
4) White 240
5) Color Bar
6) RGB Ramp (32 Step)
4-3-8 Check sum
* XXXX : Displays the current check sum size of the MICOM.
(Varies depending on program update)
4-3-9 Service Adjustement
* Used where it is difficult to receive stereo sound.
* Adjust the ‘Pilot High’ and/or ‘Pilot Low’ data to vary voltage receiving stereo sound.
* Pilot High : 16 (default)
Pilot Low : 10 (default)
4-3-10 Reset
* Initializes the data in the MICOM. (Set to default value)
The values set in factory mode remain unchanged.
4-3-11 T_VIC17NUS_1018 07/05/2003 18:12:26
* Displays the MICOM program version