4. Troubleshooting
4. Troubleshooting
4-1. Troubleshooting
4-1-1. Previous check
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.
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14p cable |
LVDS Cable |
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Power Assy |
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14p cable |
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Power Assy |
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Main Assy |
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Main Assy |
LVDS Cable |
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Speaker |
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Speaker |
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Speaker |
T-CON |
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Speaker |
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Main Assy (CN202 / 204) |
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Power Assy (CMN801) |
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Main Assy (CN201 / 203) |
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Power Assy (CMN801) |
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1 |
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B5V |
2 |
SW_PW |
1 |
B5V |
2 |
SW_PW |
1 |
B5V |
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SW_PW |
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B5V |
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2 |
SW_PW |
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3 |
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B5V |
4 |
A5V |
3 |
B5V |
4 |
A5V |
3 |
B5V |
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A5V |
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B5V |
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A5V |
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5 |
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GND |
6 |
GND |
5 |
GND |
6 |
GND |
5 |
GND |
6 |
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GND |
5 |
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GND |
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6 |
GND |
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B12VS |
8 |
GND |
7 |
B12VS |
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GND |
7 |
B12VS |
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GND |
7 |
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B12VS |
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8 |
GND |
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9 |
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B12VS |
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SW_INV |
9 |
B12VS |
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SW_INV |
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B12VS |
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SW_INV |
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B12VS |
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SW_INV |
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B13V |
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NC |
11 |
B13V |
12 |
NC |
11 |
B13V |
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NC |
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B13V |
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12 |
NC |
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13 |
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B13V |
14 |
DMM |
13 |
B13V |
14 |
DMM |
13 |
B13V |
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DMM |
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B13V |
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14 |
DMM |
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4-1
4. Troubleshooting
4-1-2. How to check fault symptom
No Power
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-- The LEDs on the front panel do not work when connecting the power cord. |
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Symptom |
-- The SMPS relay does not work when connecting the power cord. |
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-- The units appears to be dead. |
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The IP relay or the LEDs on the front panel does not work when connecting the power cord if the |
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cables are improperly connected or the Main Board or SMPS is not functioning. |
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In this case, check the following: |
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Major |
-- Check the internal cable connection status inside the unit. |
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checkpoints |
-- Check the fuses of each part. |
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-- Check the output voltage of SMPS. |
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-- Replace the Main Board. |
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No |
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Power indicator LED on? |
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Check an AC power connection. |
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Yes |
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No |
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Check the 14P power cable |
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Change 14p power cable or SMPS. |
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Yes |
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Check ‘Stand-By 5V’ DC5V appear at |
No |
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BD207(middle)/BD214(small)? |
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Yes |
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Change SMPS. |
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Check ‘Power input of Main Assy’ ? |
No |
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DC B13V, B5V appear at BD209(M)/BD221(S) |
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(B13V), BD208, BD213(M)/BD210, 212(S)(B5V)? |
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Yes |
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Check ‘Power of main IC(B1.1V)’ |
No |
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Check ‘Power of DDR IC(B1.9V)’ |
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Change the Main Assy. |
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Diagnostics |
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appear at L201 (B1.1V) |
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BD1012 (B1.9V) ? |
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Yes |
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No |
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Check ‘Power of LVDS (13V)’ appear at |
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Change the LVDS cable. |
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LVDS connector Pin #1~5 of T-con b’d? |
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Yes |
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No |
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Does proper DC B13V appear at F1 of |
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Change the T-con b’d. |
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T-con b’d? |
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Yes |
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Please, Contact tech support. |
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Caution Make sure to disconnect the power before working on the IP board.
4-2
4. Troubleshooting
Location (Main) - TOP
Location (Main) - T-CON
4-3
4. Troubleshooting
No video_HDMI1, 2 - Digital signal
Symptom |
-- |
Audio is normal but no picture is displayed on the screen. |
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Major |
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Check the HDMI source. |
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-- |
Check the HDMI switch, Check the Chelsea. |
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checkpoints |
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-- This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. |
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No |
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Power indicator LED is off. |
Check a set in the 'Stand-by mode'. |
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Lamp(Backlight) on, no video ? |
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Yes |
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check the Self Diagnosis |
No |
Check external devices and |
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(SupportSelf DiagnosisPicture Test) |
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connections. |
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Dose the promblem still exist self diagnosis ? |
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Yes |
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Check the HDMI source and |
No |
Input the HDMI signal properly. |
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check the connection of HDMI cable ? |
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Yes |
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Does the signal appear at |
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Check CN502, CN503. |
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CN602 (Pin#12 , #7 )(HDMI1) |
No |
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Check HDMI cable. |
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CN601 (Pin#12 , #7 )(HDMI2) |
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Change the Main Assy. |
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(HDMI RX_Clk , RX_Data) ? |
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Yes |
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Does the digital data appear at |
No |
Check IC1001 (X5N) |
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TP-E_TXCLK+, E_TXCLK- , |
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Change the Main Assy. |
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Diagnostics |
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O_TXCLK+, O_TXCLK-? |
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Check the LVDS cable ? |
No |
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Check the T-Con B’d ? |
Please, Contact Tech support. |
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Replace the LCD panel ? |
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Caution Make sure to disconnect the power before working on the IP board.
4-4
4. Troubleshooting
Location (Main) - TOP
4-5
4. Troubleshooting
WAVEFORMS
HDMI input (RX_Data, RX_Clk)
LVDS output
4-6
4. Troubleshooting
No Video_Tuner - CVBS
Symptom |
-- Audio is normal but no picture is displayed on the screen. |
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Major |
-- Check the Tuner CVBS source. |
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-- Check the Tuner, Check the Chelsea. |
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checkpoints |
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-- This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. |
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No |
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Power indicator LED is off. |
Check a set in the 'Stand-by mode' |
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Lamp(Backlight) on, no video ? |
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Yes |
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Check the RF source and |
No |
Input the RF source properly. |
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check the connection of RF cable ? |
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Yes |
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check the Self Diagnosis |
No |
Check external devices and |
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(SupportSelf DiagnosisPicture Test) |
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connections. |
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Dose the promblem still exist self diagnosis ? |
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Yes |
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Does the DC B1.8V B3.3V |
No |
Change the Main Assy. |
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appear at #3, #5 Pin of Tuner ? |
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Yes |
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Check the CVBS data |
No |
Change the Main Assy. |
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at #15 Pin of Tuner ? |
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Yes |
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Does the digital data appear at |
Check IC1001 (X5N). |
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TP-E_TXCLK+, E_TXCLK- , |
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Change the Main Assy. |
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Diagnostics |
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O_TXCLK+, O_TXCLK- ? |
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Yes |
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Check the LVDS cable ? |
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Check the T-Con B’d ? |
No |
Please, Contact Tech support. |
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Replace the LCD panel ? |
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Caution Make sure to disconnect the power before working on the IP board.
4-7
4. Troubleshooting
Location (Main) - TOP
4-8
4. Troubleshooting
WAVEFORMS
LVDS output
4-9
4. Troubleshooting
No Video_Tuner DTV
Symptom |
-- |
Audio is normal but no picture is displayed on the screen. |
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Major |
-- |
Check the DTV source. |
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-- Check the Tuner, Check the Chelsea. |
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checkpoints |
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-- This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. |
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No |
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Power indicator LED is off. |
Check a set in the 'Stand-by mode' |
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Lamp(Backlight) on, no video ? |
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Yes |
No |
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Check the connection of RF cable ? |
Input the RF source properly. |
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Yes |
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check the Self Diagnosis |
No |
Check external devices and |
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(SupportSelf DiagnosisPicture Test) |
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connections. |
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Dose the promblem still exist self diagnosis ? |
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Yes |
No |
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Check the 'signal strength' in Self Diagnosis |
Check the D-TV source. |
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menu Strength is enough ? |
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Yes |
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Does the DC B1.8V B3.3V |
No |
Change the Main Assy. |
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appear at #3, #5 Pin of Tuner ? |
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Yes |
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Check the DTV data(DIF+, DIF-) |
No |
Change the Main Assy. |
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Diagnostics |
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appear at #11, #10 Pin of Tuner ? |
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Yes |
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Does the digital data appear at |
No |
Check IC1001 (X5) |
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TP-E_TXCLK+, E_TXCLK- , |
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Change the Main Assy. |
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O_TXCLK+, O_TXCLK- ? |
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Yes |
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Check the LVDS cable ? |
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Check the T-Con B'd ? |
No |
Please, Contact Tech support. |
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Replace the LCD panel ? |
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Caution Make sure to disconnect the power before working on the IP board.
4-10
4. Troubleshooting
Location (Main) - TOP
4-11
4. Troubleshooting
WAVEFORMS
LVDS output
4-12