Samsung Le 27t51b Service Manual

							4 Troubleshooting
4-6
4-4 No Picture (Tuner_CVBS)
Does the signal appear at
C268?Check a IC210.
Change a main PCB assy.
Yes
Does the digital data appear 
at output of R422~R425,
R430~R433?Check a IC310.
Change a main PCB assy.
Yes Power Indicator is off. 
Lamp on, no picure.
Connect the RF cable and 
check RF signal.No
No
No
Yes
Check a LVDS cable?
Replacea lcd panel?Please, Call to Samsung Co. LTD.No
5
3
 
						

							4 Troubleshooting
4-7
WAVEFORMS
3Digital Output Data of IC3105Tuner_CVBS Output Signal
 
						

							4 Troubleshooting
4-8
4-5 No Picture (Video_CVBS)
Dose the signal 
appear at R7003?Check a connection harness.
Yes
Does the digital data appear 
at output of R422~R425,
R430~R433?Check a IC310.
Change a main PCB assy.
Yes Power Indicator is off. 
Lamp on, no picure.
NoCheck a A/V cable and video signal.
No
No
Yes
Check a LVDS cable?
Replacea lcd panel?Please, Call to Samsung Co. LTD.No
5
3
 
						

							4 Troubleshooting
4-9
WAVEFORMS
3Digital Output Data of IC3105Tuner_CVBS Output Signal
 
						

							4 Troubleshooting
4-10
4-6 No Picture (S-VIDEO_Y,C)
Dose the signal appear at
R7001, R7002?Check a connection harness.
Yes
Yes Power Indicator is off. 
Lamp on, no picure.
NoConnect the s-video cable.
Operating a video player.
No
Does the digital data appear 
at Output of R422~R425,
R430~R433?Check a IC310.
Change a main PCB assy.No
Yes
Check a LVDS cable?
Replacea lcd panel?Please, Call to Samsung Co. LTD.No
6
3
 
						

							4 Troubleshooting
4-11
3Digital Output Data of IC3106Analog Signal(Y,C)
WAVEFORMS
 
						

							4 Troubleshooting
4-12
Does the signal appear at
Pin 12, 1(CH1_L, R Sound) 
and Pin 15, 2
(CH2_L, R Sound)
of IC613?Check a connection harness and
headphone jack.
Yes
Yes
No
Check the DC 8V
appear at C653?Check a IC813. 
Change a main PCB assy.
YesNo
Does the signal appear at
L624_OP, L625_OP?Check a IC611.
Change a main PCB assy.
Yes
Replace the speaker assy?No
4-7 No Sound
7
8
9
Connect a sound cable.  
control a volume.Picture is display, no sound.No
 
						

							4 Troubleshooting
4-13
WAVEFORMS
7The Signal are Inputed to IC6108DC +8V
9Output WaveForm
 
						

							3 Alignments and Adjustments
3-1
3 Alignments and Adjustments
3-1 General Alignment Instuction
1. Usually, a color LCD-TV 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 AC 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.
 
						

							3 Alignments and Adjustments
3-2
3-2 Factor y Mode Adjustments
3-2-1 Entering Factor y Mode
To enter Service Mode Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
3-2-2 Factor y Mode Tree
- If you have Factory remote - control
[INFO] -> [FACTORY] 
Power OFFMENUMUTEPower OnINFO
1. Calibration
2. Option Byte
3. W/B
4. VCTi
5. YC Delay
6. FLI5961
7. Adjust
8. Test Pattern
9. Password
10. Check Sum
11. Spread Spectrum
12. HDCP
13. Reset
T-TRNPEU-0000 month day year time 
P-TRNPEU-0000
Panel On Time(Hour) 00001. Calibration : W/B Calibration
AV Calibration
DTV Calibration
PC Calibration
2. Option byte : Setting option
Panel option  : 32/40/23/26/27
Gamma 
: off/on
Analog Dimming  : AUO/CMO/AMLCD/Panal2
Auto Power  : on/off
Video Mute  : 5
Language : English
Hotel Mode  : off/on
LNA Plus  : off/on
V-chip : off
Auto FM  : off/on
High Deviation  : off/on
TTX List  : Flop/List
TTX Top : off/on
TTX Group : 
Auto/West Europe/East Europe/
Russian/Greek
Turkey/Arabic/
Farsian/Arab.Habrew
DVI : on/off
HDCP Key : ok
3. W/B : Adjustment White Balance
Sub Bright  : 128
R  off set : 128
G  off set  : 128
B  off set : 128
Sub contrast : 128
R  gain : 128
G  gain : 128
B gain : 128
4. VCTi: VCTi IC Correct register
VCTi Page 1
VCTi Page 2