LG 47LV355T LED LCD TV – line fault – Tcon board fault and panel fault symptoms – circuit adjustments

Circuit adjustments – line fault – Tcon board fault – Display Module fault - screen appearance  LG 47LV355T 47LV355T-ZC - LED LCD TV. North/Latin America, Europe/Africa, Asia/Oceania

  The screen fault symptoms displayed here can be taken as  reference to all LCD TVs, irrespective of its brand  and screen size.
Adjustments
1) The adjustment is according to the order which is designated and which must be followed, according to the plan which can be changed only on agreeing.
2) Power Adjustment: Free Voltage
3) Magnetic Field Condition: Nil.
4) Input signal Unit: Product Specification Standard
5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25 ºC ± 5 ºC
Relative humidity : 65 % ± 10 %
Input voltage : 220 V, 60 Hz
6) Adjustment equipments: Color Analyzer(CA-210 or CA-110), DDC Adjustment Jig equipment, Service remote control.
7) Push the “IN STOP” key - For memory initialization.

Case1 : Software version up
1. After downloading S/W by USB, TV set will reboot automatically.
2. Push “In-stop” key.
3. Push “Power on” key.
4. Function inspection
5. After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push “In-stop” key at first.
2. Push “Power on” key for turning it on.
If you push “Power on” key, TV set will recover channel information by itself.
3. After function inspection, Push “In-stop” key.

Main PCB check process
* APC - After Manual-Insult, executing APC

Boot file Download

1) Execute ISP program “Mstar ISP Utility” and then click “Config” tab.

2) Set as below, and then click “Auto Detect” and check “OK” message

If “Error” is displayed, check connection between computer, jig, and set.

3) Click “Read” tab, and then load download file(XXXX.bin) by clicking “Read”

4) Click “Connect” tab. If “Can’t” is displayed, check connection between computer, jig, and set.

5) Click “Auto” tab and set as below.

6) Click “Run”.

7) After downloading, check “OK” message.

USB DOWNLOAD

1) Put the USB Stick to the USB socket.

2) Automatically detecting update file in USB Stick.

- If your downloaded program version in USB Stick is Low, it didn’t work. But your downloaded version is High, USB data is automatically detecting.

3) Show the message “Copying files from memory”.

4) Updating is starts.

5) Uploading completed, The TV will restart automatically.

6) If your TV is turned on, check your updated version and

Tool option.(explain the Tool option, next stage)

* If downloading version is more high than your TV have, TV can lost all channel data. In this case, you have to channel recover. if all channel data is cleared, you didn’t have a DTV/ATV test on production line.

After downloading, have to adjust Tool option again.

1) Push “IN-START” key in service remote control.

2) Select “Tool option 1” and push “OK” key.

3) Punch in the number. (Each model has their number)

4) Completed selecting Tool option.

ADC Process
(1) ADC
- Enter Service Mode by pushing “ADJ” key,
- Enter Internal ADC mode by pushing “ Right arrow” key at “7. ADC Calibration.

Caution:  Using ‘P-ONLY’ key on Adjustment remote control, power on TV.

Adjust Sequence
• aa 00 00 [Enter Adjust Mode]
• xb 00 40 [Component1 Input (480i)]
• ad 00 10 [Adjust 480i Comp1]
• xb 00 60 [RGB Input (1024*768)]
• ad 00 10 [Adjust 1024*768 RGB]
• aa 00 90 End Adjust mode
* Required equipment : Adjustment remote control.

Function Check

* Check display and sound.

- Check Input and Signal items. (cf. work instructions)

1) TV

2) AV1/2

3) COMPONENT (480i)

4) RGB (PC : 1024 x 768 @ 60 Hz)

5) HDMI

6) PC Audio In

* Display and Sound check is executed by Remote control.

MAC Address
(1) Equipment & Condition
- Play file: Serial.exe
- MAC Address edit
- Input Start / End MAC address.

(2) Download method
1) Communication Port connection.

Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port

2) MAC Address & CI+ key Download
- Set CI+ key path Directory at start Mac & CI Download Program
- Com 1,2,3,4 and 115200(Baud rate)

- Port connection button click(1)
- Push the (2) MAC Address write.
- At success Download, check the OK(3)
- Start CI+ Download, Push the (4)
- Check the OK or NG

LAN

(1) Equipment & Condition

- Each other connection to LAN Port of IP Hub and Jig

(2) LAN inspection solution

- LAN Port connection with PCB

- Network setting at MENU Mode of TV

- setting automatic IP

- Setting state confirmation

> If automatic setting is finished, you confirm IP and MAC Address.

LAN PORT INSPECTION(PING TEST)

Connect SET -> LAN port == PC -> LAN Port

SET         PC

Equipment setting
1) Play the LAN Port Test PROGRAM.
2) Input IP set up for an inspection to Test Program. *IP Number : 12.12.2.2
(2) LAN PORT inspection (PING TEST)
1) Play the LAN Port Test Program.
2) Connect each other LAN Port Jack.
3) Play Test (F9) button and confirm OK Message.
4) Remove LAN CABLE.

LCD TVs – T Con board fault – Module fault – Line fault 

T’Con board fault -  screen appearance

Back light LED driver fault – screen appearance

Display module fault – screen appearance  Un-repairable Cases.  In this case please exchange the module.

LG adjust remote control.  This remote control can be purchased from authorized service centers for LG.  The remote control can be used with all models of LG TVs, for adjustments.
To enter service mode and to do all other adjustments to LG TVs [irrespective of model and type], this remote control is a must.  Can't do these adjustments, with customer remote control