Samsung LA26A450C1 Schematic

LCD-TV

Chassis : GCR26ASA

GCR32CCN

GCR32TSA

GCR37ASA

GCR37CCN

Model : LA26A450C1

LA26A350C1

LA32A450C1

LA32A350C1

LA37A450C1

LA37A350C1

SERVICE Manual

TFT-LCD TV

LA26A450C1/LA26A350C1

/LA32A450C1/LA32A350C1

LA37A450C1/LA37A350C1

Contents

1.Precautions

2.Product specifications

3.Disassembly and Reassembly

4.Troubleshooting

5.Exploded View & Part List

6.Wiring Diagram

7.Schematic Diagram

Refer to the service manual in the GSPN (see the rear cover) for the more information.

Contents

1. Precautions...............................................................................................................		1-1
1-1.	Safety Precautions..........................................................................................................	1-1
1-2.	Servicing Precautions......................................................................................................	1-2
1-3.	Electrostatically Sensitive Devices (ESD) Precautions...................................................	1-2
1-4.	Installation Precautions...................................................................................................	1-3

2. Product specifications.............................................................................................		2-1
2-1.	Feature & Specifications.................................................................................................	2-1
2-3.	Spec Comparison to the Old Models...............................................................................	2-6
2-4. Accessories.....................................................................................................................		2-7

3. Disassembly and Reassemble................................................................................	3-1
3-1. Disassembly....................................................................................................................	3-1
4. Troubleshooting.......................................................................................................	4-1
4-1. Troubleshooting...............................................................................................................	4-1
4-2. Alignments and Adjustments.........................................................................................	4-15
4-3. Factory Mode Adjustments............................................................................................	4-16
4-4. White Balance - Calibration...........................................................................................	4-19
4-5. White Ratio (Balance) Adjustment.................................................................................	4-21
4-6. HOW TO UPGRADE.....................................................................................................	4-22
5. Exploded View & Part List.......................................................................................	5-1
5-1. LA26A450C1X / LA26A350C1X Exploded View.............................................................	5-1
5-2. LA32A450C1X / LA32A350C1X Exploded View.............................................................	5-3
5-3. LA37A450C1X / LA37A350C1X Exploded View.............................................................	5-5
5-4. LA26A450C1X Parts List.................................................................................................	5-7
5-5. LA32A450C1X Parts List...............................................................................................	5-32
5-6. LA37A450C1X Parts List...............................................................................................	5-57
6. Wiring Diagram.........................................................................................................	6-1
6-1. Wiring Diagram................................................................................................................	6-1
6-2. Wiring Picture..................................................................................................................	6-4
6-3. Connector Functions.......................................................................................................	6-5
6-4. Cables.............................................................................................................................	6-6

GSPN (Global Service Partner Network)

Area	Web Site
North America	http://service.samsungportal.com
Latin America	http://latin.samsungportal.com
CIS	http://cis.samsungportal.com
Europe	http://europe.samsungportal.com
China	http://china.samsungportal.com
Asia	http://asia.samsungportal.com
Mideast & Africa	http://mea.samsungportal.com

This Service Manual is a property of Samsung Electronics Co.,Ltd.

Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

© 2008 Samsung Electronics Co.,Ltd. All rights reserved.

Printed in Korea

P/N: BN82-00339B-00

GSPN (Global Service Partner Network)

Area	Web Site
North America	http://service.samsungportal.com
Latin America	http://latin.samsungportal.com
CIS	http://cis.samsungportal.com
Europe	http://europe.samsungportal.com
China	http://china.samsungportal.com
Asia	http://asia.samsungportal.com
Mideast & Africa	http://mea.samsungportal.com

This Service Manual is a property of Samsung Electronics Co.,Ltd.

Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

© 2008 Samsung Electronics Co.,Ltd. All rights reserved.

Printed in Korea

P/N: BN82-00339B-00

4. Troubleshooting

4. Troubleshooting

4-1. 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 or loose cable connection.

•Check to see if the cables are connected according to the connection diagram.

2.Check the power input to the Main Board.

Check internal Pattern FBE3 if there is some picture noise.

FBE3: Factory mode(Info - MENU - MUTE - power on_ -> 4. Advanced menu -> Option block-> FBE->Pattern Select

Press right button of Remocon.

If FBE3 NG,change the main Board

4-1

4. Troubleshooting

4-1-1. 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 units appears to be dead.
		The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
		improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
	Major	- Check the internal cable connection status inside the unit.
		- Check the fuses of each part.
	checkpoints
		- Check the output voltage of SMPS.
		- Replace the Main Board.

			No
	LAMP off, power indicator					Check a connection a power cable.
	LED red color?
		Yes
Diagnostics
	Does proper DC 13V appear at		No
1						Change a Assy PCB Power.
	pin20 of CN1001?
		Yes	No
2	Does proper DC A3.3V					Check a IC1011
	appear at C1040?					Change a main PCB ass’y
		Yes
			No			Check a IC1006, IC1012.
3	Does proper DC 5V, 3.3V, 1.2V appear
						Change a main PCB ass’y
	at C1005, C1038, C1063?
		Yes
4	A power is supplied to set?

Caution

Make sure to disconnect the power before working on the IP board.

4-2

4. Troubleshooting

4-1-2. No Video (Analog PC signal)

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the PC source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

	Power Indicator is off.
	Lamp on, no video.
		Yes
					Input a analog PC signal and
	Check a PC source and check		No
	the connection of DSUB cable?				connected cable(DPMS).
Diagnostics		Yes
1	Does the signal appear at C5050,		No		PC cable. Change a PC
	C5049, C5047(R,G,B) of IC5001				cable. Change a main PCB ass’y.
		Yes	No
2	Does the digital data appear at the				Check a IC6001.
	output of LVDS (R6048~6045_FBE)?				Change a main PCB ass’y
		Yes
3	Check a LVDS cable?
	Replace a lcd panel?
		Yes
	Please, Call to Samsung Co. LTD.

Caution

Make sure to disconnect the power before working on the IP board.

4-3

4. Troubleshooting

WAVEFORMS

1	R,G,B Output Signal

4-4

4. Troubleshooting

4-1-3. No Video (HDMI - Digital Signal)

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the HDMI source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

	Power Indicator is off.
	Lamp on, no video.
		Yes
1	Check the connection		No			Input a HDMI cable.
	of HDMI cable?
Diagnostics		Yes
	Does the digital data appear at		No			Check a IC1402.
2
	R5055~5062,R5066~5073?					Change a main PCB ass’y.
		Yes	No
3	Does the digital data appear at output of					Check a IC1401.
	IC5001(R6048~6045_FBE)?					Change a main PCB ass’y.
		Yes
	Check the LVDS cable?
	Replace the LCD panel?
		Yes
	Please, Contact Tech support

Caution

Make sure to disconnect the power before working on the IP board.

4-5

4. Troubleshooting

WAVEFORMS

2	Digital Output Data

3	Signal of HDMI(Data)

4-6

4. Troubleshooting

4-1-4. No Video (Tuner_CVBS)

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the Tuner CVBS source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

		Power Indicator is off.		No		Connect the RF cable and
		Lamp on, no picure.				check RF signal.
			Yes	No
	Diagnostics	Does the signal appear at R3235?				Check a B+ voltage (#7of Tuner) 5V,
						change a main PCB ass’y.
			Yes
		[4] Does the signal appear at C5068		No		Change a main PCB ass’y.
		of IC5001?
			Yes

Check the LVDS cable?

Replace the LCD panel?

Yes

Please, Call to Samsung Co. LTD.

Caution

Make sure to disconnect the power before working on the IP board.

4-7

4. Troubleshooting

WAVEFORMS

3 CVBS Output Signal

4 Tuner_CVBS Output Signal

4-8

4. Troubleshooting

4-1-5. No Picture (Video_CVBS)

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the Video Source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

	Power Indicator is off.		No		Check a A/V cable and video signal.
	Lamp on, no picture.
Diagnostics		Yes
			No
1	Does the signal appear at C5064				Check a connection harness.
	or C5061 of IC5001?
		Yes
2	Check a LVDS cable ?
	Replcelcd panel?
		Yes

Please, Call to Samsung Co. LTD.

Caution

Make sure to disconnect the power before working on the IP board.

4-9

4. Troubleshooting

WAVEFORMS

4 CVBS Output Signal

4-10

4. Troubleshooting

4-1-6. No Picture (S-VIDEO_Y,C)

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the S-Video_Y,C source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

		Power Indicator is off.
				No		Connect the s-video cable.
Diagnostics		Lamp on, no picure.				Operating a video player.
			Yes
	1	Does the Y/C signal appear at		No		Check a connection harness.
		C5062or C5063 of IC5001?
			Yes
	2	Check a LVDS cable ?
		Replcelcd panel?
			Yes

Please, Call to Samsung Co. LTD.

Caution

Make sure to disconnect the power before working on the IP board.

4-11

4. Troubleshooting

WAVEFORMS

2 Digital Output Data

5 Analog Signal(Y,C)

4-12

4. Troubleshooting

4-1-7. No Sound

	Symptom	-	Audio is normal but no picture is displayed on the screen.
	Major	- Check the RF Source
		-	Check the M-star
	checkpoints
		-	This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

		Picture is display, no sound.		No		Connect a sound cable.
						control a volume.
			Yes
Diagnostics		Does the signal appear at pin 232, 236,		No		Check a connection harness and
	1	234,237(I2S_CLK, I2S_SCLK, I2S_				headphone jack./Side AV
						Check Sound Processor
		LRCLK, I2S_DATA) of IC1201?
						IC5001 (M-star)
			Yes
	2	Check the DC 12V		No		Check a B12V Line.
		of IC2001?				Change a main PCB ass’y
			Yes
		Does the signal appear at
		Pin 47 or 48, 53 or		No		Change a main PCB ass’y.
	3	54(CH1_L, R Sound) And Pin
		36 or 37, 30 or 31
		(CH2_L, R Sound) of IC2001?
			Yes
		Replace the speaker ass’y?

Caution

Make sure to disconnect the power before working on the IP board.

4-13

4. Troubleshooting

WAVEFORMS

6 The Signal are Inputed to IC1201

7 The Signal are Inputed to IC1202

4-14

4. Troubleshooting

4-2. Alignments and Adjustments

4-2-1. 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 against shock hazard, use an isolation transformer.

4-15

4. Troubleshooting

4-3. Factory Mode Adjustments

4-3-1 Entering Factory Mode

To enter ‘Service Mode’ Press the remote -control keys in this sequence :

- If you do not have Factory remote - control

INFO MENU MUTE Power on - If you have Factory remote - control

PICTURE ON				DISPLAY				FACTORY

- The buttons are active in the service mode.

1.Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left Arrow Right, Menu, Enter, Number Key(0~9)

2.Function - Control Key : Power, CH +, CH -, VOL +, VOL -,

Menu, TV/VIDEO(Enter)

4-3-2 Panel Check

You have to check Panel Maker Because of different adjustments as follows. First of all, Check the label rating!

1)Label Rating File

-LCD PANEL MARK A:ACER(AUO) S : SEC C : CMO

* If not printed you could consider S(sec) panel mark.

4-16

4. Troubleshooting

4-3-3 Factory Data

1.Option Table(Service)

2.WB Adjust

3.Information

4.Advanced Menu Checksum T-CRL32MEAM-****

HDCP Success

Month/Day/Year/Hour/MIN/SEC

1.Option Table(Service) 26” Option

	No	Item	Range	Option
	1	Factory Reset
	2	Country(0x55)	Default_0
	3	Ready	ON/OFF	ON
	4	Inch Option	19/22/23/26/27/32/37/40	26/32/37
			/42/46/50/52/57
	5	Dimm Type	INT/INT_NEG/EXT_POS/EXT_NEG/EXT/	INT
			19AM_TN/22AU_TN/22CM_TN/26AM_AG/	26AM_AG/
			26AU_AG/26CM_NG/32AU_AG/32AU_NG/
	6	Panel Type		32AU_AG/
			32CM_NG/32CM_AG/37AU_AG/37CP_AG/
				37CP_AG
			40AU_AG/40AM_AG
	7	Model Option	Coral/Jade/Tanzanite/Pyrope/Amber	Coral
			Pyrope_3D/Carnelian/Carnelian_3D
	8	Anynet +	ON <-> OFF	ON
	9	Light Effect	ON <-> OFF	OFF
	10	TTX	ON <-> OFF	ON
	11	TTX List	List <-> FLOF	FLOF
	12	TTX Group	Lang OSD/ W Europe/Russia/Greek/Turek/ Arab/Farsi/	Lang OSD
			ArabHbrw
	13	Carrier Mute	ON <-> OFF	OFF
	14	High Devi	ON <-> OFF	OFF
	15	Volume Curve	EA/EU	EA
	16	HotPlug	ON <-> OFF	ON
	17	HotPlugCtrl	ON <-> OFF	ON
	18	HotPlugDelay	0 ~ 63	12
	19	Auto Power	ON <-> OFF	ON
	20	LNA Menu	OFF	OFF
	21	Hotel Option	On <-> Off	OFF
	22	D.Gamma	OFF/0.85/0.88/0.90/0.93/0.95/0.98/ M1/M2/M3/M4	0.98/0.93/0.93
	23	PC Ident	ON <-> OFF
	24	Language	Europe/CIS (21 Language)	English
	25	Ch Table	SUWON/SESK/SHE/etc	Select Local area
	26	DDR	Etron
	27	Shop Mode	ON <-> OFF	OFF
	28	Nordic	OFF
	29	Arabic	ON <-> OFF	ON
	30	NT Conversion	ON <-> OFF	OFF

4-17

4. Troubleshooting

No	Item	Range	Option
31	Control	-
	WM Calib	ON/OFF	OFF
	EDID Protect	ON/OFF	ON
	Edid Type	Coral/P450-50HP/P450-42HP	L12_1366_768
	EDIE Write	Failure/Success	L12_1366_768 Succes
	WB Data Reset	ON <-> OFF	OFF
	EEPROM Reset
	Logic Download	ON <-> OFF	OFF
32	PDP Filter	42” 3D
33	PDP Group	P34A_R3d
34	Spread Spectrum	ON/OFF	ON
	Step1	0~255	30
	Step2	0~255	9
	Range1	-	0
	Range2	-	44
	FBE SSC	-	5

4-18

4. Troubleshooting

4-4. White Balance - Calibration

4-4-1 White Balance -Calibration

1. Calibration				AV Calibration
				Comp Calibration
				PC Calibration
				HDMI Calibration

4-4-2 Service Adjustment - You must perform Calibration in the Lattice Pattern before adjusting the White Balance.

 Color Calibration

Adjust spec.
1.	Source	: HDMI
2.	Setting Mode	: 1280*720@60Hz
3.	Pattern	: Pattern #24 (Chess Pattern)

( Chess Pattern )

4. Use Equipment : CA210 & Master MSPG925 Generator

- Use other equipment only after comparing the result with that of the Master equipment.

	Input mode	Calibration	Pattern
	CVBS IN (Model_#1)	Perform in NTSC B&W Pattern #24	Lattice
	Component IN (Model_#6)	Perform in 720p B&W Pattern #24	Lattice
	PC Analog IN (Model_#21)	Perform in VESA XGA (1024x768)	Lattice
		B&W Pattern #24
	HDMI IN	Perform in 720p B&W Pattern #24	Lattice
		<Table 1>

4-19

4. Troubleshooting

 Method of Color Calibration (AV)

1) Apply the NTSC Lattice (N0. 3) pattern signal to the AV IN 1 port 2) Press the Source key to switch to “AV1” mode

3) Enter Service mode

4) Select the “Calibration” menu

5) Select the “AV Calibration” menu.

6) In “AV Calibration Off” status, press the “ ” key to perform Calibration. 7) When Calibration is complete, it returns to the high-level menu.

8) You can see the change of the “AV Calibration” status from Failure to Success.

 Method of Color Calibration (Component)

1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port 2) Press the Source key to switch to “Component1” mode

3) Enter Service mode

4) Select the “Calibration” menu

5) Select the “Comp Calibration” menu.

6) In “Comp Calibration Off” status, press the “ ” key to perform Calibration. 7) When Calibration is complete, it returns to the high-level menu.

8) You can see the change of the “Comp Calibration” status from Failure to Success.

 Method of Color Calibration (PC)

1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port 2) Press the Source key to switch to “PC” mode

3) Enter Service mode

4) Select the “Calibration” menu

5) Select the “PC Calibration” menu.

6) In “PC Calibration Off” status, press the “ ” key to perform Calibration. 7) When Calibration is complete, it returns to the high-level menu.

8) You can see the change of the “PC Calibration” status from Failure to Success.

 Method of Color Calibration (HDMI)

1)Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port

2)Press the Source key to switch to “HDMI1” mode

3)Enter Service mode

4)Select the “Calibration” menu

5)Select the “HDMI Calibration” menu.

6)In “HDMI Calibration Off” status, press the “ ” key to perform Calibration.

7)When Calibration is complete, it returns to the high-level menu.

8)You can see the change of the “HDMI Calibration” status from Failure to Success.

4-20

4. Troubleshooting

4-4-3 White Balance - Adjustment

				(low light)	(hight light)
				Sub Bright	Sub Contrast
3. W/B
				R offset	R gain
				G offset	G gain
				B offset	B gain

(W/B adjustment Condition refer next page)

4-5. White Ratio (Balance) Adjustment

1.You can adjust the white ratio in factory mode (1:Calibration, 3:White-Balance).

2.Since the adjustment value and the data value vary depending on the input source, you have to adjust these in CVBS, Component 1 and HDMI 1 modes.

3.The optimal values for each mode are configured by default. (Refer to Table 1, 2) It varies with Panel’s size and Specification.

- Equipment : CS-210

- Pattern: MIK K-7256 #92 “Flat W/B Pattern” as standard

- Use other equipment only after comparing the result with that of the Master equipment.

- Set Aging time : 60min
- Calibration and Manual setting for WB adjustment.
HDMI : Time #6 720P, Pattern #24 Chessboard Calibration				Manual adjustment #92 pattern (720p)
COMP: Time #6 720P, Pattern #24 Chessboard Calibration				Manual adjustment at #92 pattern (720p)
CVBS: Time #2 PAL, Pattern #24 Chessboard Calibration				Manual adjustment at #92 pattern (NTSC)
PC: Time #21 1024*768, Pattern #24 Chessboard Calibration				Manual adjustment at #92 pattern (NTSC)

-If finishing in HDMI mode, adjustment coordinate is almost same in AV/COMP mode.

-White Balance Manual Adjustment

4-21

4. Troubleshooting

					CA-210
			x	y	Y(L)	T(K) + MPCD
		H/L	272	287	-	11,000 (+10)
	CVBS				(Sub_CT:145)
	(NTSC)	L/L	272	287	12.2cd/m2	11,000 (+10)
					(3.52 Ft - Sub_BR:128)
		H/L	272	287	-	11,000 (+10)
	COMP				(Sub_CT:145)
	(720P)	L/L	272	287	12.1cd/m2	11,000 (+10)
					(3.5 Ft - Sub_BR:128)
		H/L	272	287	-	11,000 (+10)
	HDMI				(Sub_CT:145)
	(720P)	L/L	272	287	12.0cd/m2	11,000 (+10)
					(3.5 Ft - Sub_BR:128)

-Adjustment Specification

White Balance : High light (±3), Low light (±5) Luminance : High light (±0.1Ft/L), Low light (±0.1Ft/L)

4-6. HOW TO UPGRADE

4-6-1 Software Upgrade (MSTAR ISP Tool)

 MSTAR ISP TOOL

4-22

4. Troubleshooting

4-6-2 Software Upgrade (Flash Downloader)

 Flash Downloader

4-23

4. Troubleshooting

4-6-3 After S/W Upgrade

How to Access Service Mode

Entering Factory Mode

<Power OFF> → <INFO> → <MENU> → <MUTE> → <Power ON>

 Factory Data

1.Option Table(Service)

2.WB Adjust

3.Information

4.Advanced Menu

If you want to enter here, press “0000”.

 How to Initialize.

Click “1. Option Table(Service)” → “Factory Reset” in Factory Menu.

You can make every setting in Factory Initial Status.

4-24

5. Exploded View & Part List

5. Exploded View & Part List

5-1. LA26A450C1X / LA26A350C1X Exploded View

M0014

M0013

M0254

T0175

T0447

M0115

M0027

M0215

M0146

M0125

T0003

5-1

5. Exploded View & Part List

5-1-1. LA26A450C1X / LA26A350C1X Parts List

Location No.	Code No.	Description & Specification	Q’ty	S.A/S.N.A	Remark
T0003	BN96-06783L	ASSY COVER P-FRONT;26L450,SO,ABS+PMMA,HB	1	S.A
M0215	BN07-00528A	LCD-PANEL;LTF260AP01	1	S.A
T0175	BN96-06822C	ASSY SPEAKER P;8ohm,CORAL,LCD 26”,5W,4pi	1	S.A
T0447	BN96-06957A	ASSY BRACKET P-PANEL;26L450,AMLCD,,SECC,	1	S.N.A
M0014	BN94-01713A	ASSY PCB MAIN;LA26A450C1X*	1	S.A
M0115	BN61-02947A	BRACKET-STAND LINK;JASMINE 32”,SECC,T1.6	1	S.A
T0101	BN61-03346A	BRACKET-WALL;LCD TV,SECC,T1.2	4	S.N.A
M0013	BN96-07210A	ASSY COVER P-REAR;26L450,SO,HIPS,HB,BK50	1	S.A
M0027	BN96-06463F	ASSY STAND P-BASE;22,26L450,ABS+PMMA,HB,	1	S.A

5-2