LG 32LN570B (CHASSIS:LT33B) Service Manual ▷ View online
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18 or 24 Pin
(Power Board ↔ Main Board) -
공
통
SMAW200-H24S (YEONHO)
1
PWR ON/OFF
2
DVR ON/OFF
3
3.5V
4
PDIM #1
5
3.5V
6
PDIM #2
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
24V or N.C
17
GND
18
GND
19
GND
20
GND
21
GND
22
V-SYNC
23
SPI-SIN
24
SPI-SCLK
The Wafer,18Pin and 24Pin, is used by operating LocalDimming or not
LocalDimming
LocalDimming
- 24Pin wafer is applied operating L/D at power and main B/D
- 18Pin wafer is applied not operating L/D at power and main B/D
- 18Pin wafer is applied not operating L/D at power and main B/D
Standard Repair Process Detail Technical Manual
Checking order when there is no audio
① Check the contact condition of or 24V connector of Main Board
② Measure the 24V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
③ Connect the tester RX1 to the speaker terminal and if you hear the “Chik Chik” sound when you touch the GND
and output terminal, the speaker is normal.
and output terminal, the speaker is normal.
Voltage and speaker checking method
when there is no audio
when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A25
Established
date
Revised
date
Error
symptom
Content
LCD TV
①
②
③
②
2012. 12 .21
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FRONT
REAR
A Type
B Type
C Type
P4102
1
GND
2
KEY1
3
KEY2
4
+3.5V_ST
5
GND
6
LOGO/LED_R
7
IR
8
GND
9
N/A
10
N/A
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.5V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
3. Check the st-by 3.5V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
Tester needle moves slowly, and defective when it does not move at all.
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
①
②
③
④
2012. 12 .21
Standard Repair Process Detail Technical Manual
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Sequence of the Vcom adjustment
D. VCOM Adjustment
1. Case
■ LCD module change
■ T-Con board change
■ T-Con board change
2. Equipment
■ Service Remote controller
3. Adjust sequence
■ Press the ‘adj’ key
■ select V-COM
■ As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
■ Push the OK key to store the value. Then the message “Saving OK” is pop.
■ Press the exit key to finish V-COM adjustment.
■ select V-COM
■ As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
■ Push the OK key to store the value. Then the message “Saving OK” is pop.
■ Press the exit key to finish V-COM adjustment.
A28
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 12 .21
Standard Repair Process Detail Technical Manual
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Status
Power off List
Explanation
Normal
POWER_OFF_BY_REMOTE KEY
POWER_OFF_BY_REMOTE CONTROL
POWER_OFF_BY_OFF_TIMER
POWER_OFF_BY_OFF TIMER
POWER_OFF_BY_SLEEP_TIMER
POWER_OFF_BY_SLEEP TIMER
POWER_OFF_BY_TS_END
POWER_OFF_BY_REMOTE or LOCAL KEY While recording
POWER_OFF_BY_INSTOP_KEY
POWER_OFF_BY_INSTOP KEY
POWER_OFF_BY_AUTO_OFF
POWER_OFF_BY_AUTO OFF
POWER_OFF_BY_ON_TIMER
POWER_OFF_BY_ON TIMER
POWER_OFF_BY_RS232C
POWER_OFF_BY_RS232C
POWER_OFF_BY_RESREC
POWER_OFF_BY_Reservated Record
POWER_OFF_BY_RECEND
POWER_OFF_BY_End of Recording
POWER_OFF_BY_SWDOWN
POWER_OFF_BY_S/W Download
POWER_OFF_BY_LOCAL_KEY
POWER_OFF_BY_LOCAL KEY
POWER_OFF_BY_OTA
POWER_OFF_BY_End of OTA
POWER_OFF_BY_SIGNAL_DETECT
POWER_OFF_BY_Another MICOM (Only OLED)
POWER_OFF_BY_RESET
POWER_OFF_BY_Factory Reset
POWER_OFF_BY_UNKNOWN
POWER_OFF_BY_unknown status except listed case
Abnormal
POWER_OFF_BY_ABN
POWER_OFF_BY_abnormal Panel status
POWER_OFF_BY_KEY_TIMEOUT
POWER_OFF_BY_abnormal Power Off Key At Warm/Hot status
POWER_OFF_BY_ACDET
POWER_OFF_BY_AC OFF
POWER_OFF_BY_5VMNT
POWER_OFF_BY_AC DETECT
POWER_OFF_BY_NO_POLLING
POWER_OFF_BY_MCU Abnormal for 15 sec.
POWER_OFF_BY_1SEC_POWER_OFF
POWER_OFF_BY_MCU Abnormal status with Power Off Key
POWER_OFF_BY_20VMNT
POWER_OFF_BY_abnormal Panel status (Only OLED)
Appendix : Power OFF History
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