Samsung LE26A45-C, LE32A45-C, LE37A45-C, LE40A45-C Diagram

4. Troubleshooting

4-1. Troubleshooting

Check the various cable connections rst.

• 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.

Check the power input to the Main Board.

4. Troubleshooting

4-1

4. Troubleshooting

4-1-1. No Power

Symptom

Major

checkpoints

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:

The LEDs on the front panel do not work when connecting the power cord. The SMPS relay does not work when connecting the power cord. The units appears to be dead.

Check the internal cable connection status inside the unit. Check the fuses of each part. Check the output voltage of SMPS. Replace the Main Board.

Diagnostics

Lamp(Backlight) Off, power indicator

LED on?

Yes

Does proper Stand-By DC

A5V appear at D1001?

Yes

Does proper Main DC B13V_S, B5V,

B13V appear at #7,8 of CN1001,

C1083, BD11BL?

Yes

Does proper DC A3.3V

appear at C1081?

Yes

Does proper DC B3.3V appear at

C1085?

Yes

Does proper 1.2V_CORE appear at

C2032?

Change the power cable.

26”: BN39-00802A 32”: BN39-00802C 37”: BN39-00802S 40”: BN39-00802F

Change the Main Power assembly.

The location is T0764.

Check IC1002

Change the Main Ass`y

26” : BN94-01638C 32” : BN94-01638D 37” : BN94-01638E 40” : BN94-01638F

Check IC1003

Change the Main Ass`y

26” : BN94-01638C 32” : BN94-01638D 37” : BN94-01638E

40” : BN94-01638F

Check IC3001

Change the Main Ass`y

26” : BN94-01638C 32” : BN94-01638D 37” : BN94-01638E 40” : BN94-01638F

4-2

Caution

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

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

Symptom Audio is normal but no picture is displayed on the screen.-

Check the PC source

Major

checkpoints

Diagnostics

Check the MSD2248AL

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Check the PC source and

check the connection of DSUB?

Yes

Does the signal appear at

#w1, #u1, #AB2, #F1, #G1 (R, G, B, H, V) of IC3001?

Yes

4. Troubleshooting

Input an analog PC signal.

Check the connected cable.

Check IC1001, PC cable.

Change the PC cable. Change the main

PCB assembly

Does the digital data appear at output

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

of R3007~R3014?

Yes

of R3088F, R3089F?

Yes

Check the LVDS cable?

Replace the LCD panel?

Change the main PCB assembly

Check IC3001

Check IC4001

Please, Contact Tech support

4-3

4. Troubleshooting

WAVEFORMS

1 2

PC Input (V-Sync, H-Sync)

LVDS Out (CLK + / -)

4-4

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

Symptom Audio is normal but no picture is displayed on the screen.-

Check the HDMI source

Major

checkpoints

Diagnostics

Check the MSD2248AL

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Check the HDMI source and check

the connection of HDMI cable?

Yes

Does the signal appear at

R7049, R7050(CLK+/-),

R7051~R7056(DATA)??

Yes

4. Troubleshooting

Input an HDMI signal.

Check the connected cable.

Check JA7001, JA7002, JA801S(SIDE),

HDMI cable.

Change the HDMI cable. Change

the main PCB assembly

Does the digital data appear

at output of R7049, R7050(CLK-/+),

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

R7051~R7056(DATA)?

Yes

Does the digital data appear at

output of R3082F~R3095F?

Yes

Check the LVDS cable?

Replace the LCD panel?

Change the main PCB assembly

Check IC3001

Check IC4001

Please, Contact Tech support

4-5

4. Troubleshooting

WAVEFORMS

4 5

HDMI Input (CLK + / -)

Tuner CVBS Out (Pattern: Grey Bar)

TS DATA Out (Clk, Data [0])

4-6

4-1-4. No Video (Tuner_CVBS)

Symptom Audio is normal but no picture is displayed on the screen.-

Check the Tuner CVBS source

Major

checkpoints

Check the MSD2248AL

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

4. Troubleshooting

Diagnostics

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Check the RF source and

check the connection of RF cable?

Yes

Does the signal appear at TU5001?

Yes

Does the digital data appear at output

of R5006~R5020, R5022~R5029?

Yes

Does the digital data appear at output

of R3082F~R3095F?

Yes

Check the LVDS cable?

Replace the LCD panel?

Input the RF signal.

Check the connected cable.

Check TU5001

Change the main PCB assembly or tuner.

Check IC3001

Change the main PCB assembly

Check IC4001

Change the main PCB assembly

Please, Contact Tech support

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

4-7

4. Troubleshooting

WAVEFORMS

Tuner CVBS Out (Pattern: Grey Bar)

TS DATA Out (Clk, Data [0])

Eagle+ Out (Clk, H-Sync)

4-8

4-1-5. No Video (Tuner DTV)

Symptom Audio is normal but no picture is displayed on the screen.-

Check the DTV source

Major

checkpoints

Check the MSD2248AL

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

4. Troubleshooting

Diagnostics

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Check the RF source and

check the connection of RF cable?

Yes

Does the digital data appear

at R5022~R5029(TS DATA)

Yes

Does the digital data appear at output

of R5006~R5020, R5022~R5029?

Yes

Does the digital data appear at output

of R3082F~R3095F?

Yes

Check the LVDS cable?

Replace the LCD panel?

Input the RF signal.

Check the connected cable.

Check TU5001

Change the main PCB assembly

or tuner.

Check IC3001

Change the main PCB assembly

Check IC4001

Change the main PCB assembly

Please, Contact Tech support

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

4-9

4. Troubleshooting

WAVEFORMS

Tuner CVBS Out (Pattern: Grey Bar)

TS DATA Out (Clk, Data [0])

Eagle+ Out (Clk, H-Sync)

4-10

+ 22 hidden pages