LG 42LT770H (CHASSIS:LA2FF) Service Manual ▷ View online
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6.2.2. Check the power out & IR out – commercial
check jig
(1) Connect each other RS232c port on the Commercial Check
JIG
(2) Press RED Color Button on SVC Remote-controller in
power only mode (or PCB Mode)
(3) Check the LED of jig board
- +12V LED (OK condition: Turn On)
- IR LED (OK condition: blinking)
6.2.3. Check the power out & IR out – mini jig
(1) Connect mini jig on RS232c port
(2) Press RED Color Button on SVC Remote-controller in
power only mode (or PCB Mode)
(3) Check the LED of mini jig
6.2.4. Check the power out & IR out – New jig
(1) Of the DFT process performance tests showing Waite
Massage automatically scan pause
(2) Adjust the remote control Press any Key IR Out Make sure
that only Nomal LED blinks.
(3) ETC Key -> red Pressing the Info Key
i) 5V Out Output 3 seconds
ii) 5V output OFF
iii) 12V Out Output 3 seconds
iv) 12V output OFF(Given the ST output time adjustable)
(4) Nomal LED, 5V LED, 12V LED flicker worker using the
PASS.
(5) After the check is complete automatic test is initiated.
6.3. RJP Check
6.3.1. Initial setting
(1) Select Power switch ( up ) as the picture
(2) Set the Switch No.5 to ON (up) as the picture
Others should be set to OFF (down)
6.3.2. Checking Guide
(1) Press the P-ONLY key of R/C
(2) Press the Exit key of R/C
(3) Connect with the TV through RJP cable (wait for the JIG
on)
(4) RJP Pin check is carried out automatically
(5) The result is shown as below
(6) If RJP Pin check finished or you check other function, must
remove the RJP cable from TV
* RJP Cable : Direct LAN Cable
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6.4. Pro:Idiom Check
(1) Connect the RF Cable
(2) Turn to the Pro:Idiom channel (No. 96-1)
(3) Check the video & sound
** Only displayed at “POWER ONLY” mode
6.5. b-LAN Main board Check
6.5.1. Overview
It is LNET RF modem & FTG card
6.5.2. Equipment
(1) b-LAN Checker: UTC-1000 (with Cable accessory)
(2) Computer(for test result monitoring)
(3) Connection JIG
6.5.3. Equipment connection map & b-LAN Check
6.5.4. Check
6.5.4.1. Setting Procedure
(1) Setting JIG
i) Connect UTC-1000 Equipment to JIG device as a like left
picture
(2) Working procedure
i) Connection
UTC-1000 LAN <- -> PC LAN Port
UTC-1000 TOP1 <- -> Game port(RJ21)
-> TV-LINK CFG (Phone Jack)
UTC-1000 RF1 <- -> b-LAN RF IN
ii) Power on JIG : Switch on front of the JIG
iii) Test Start
UTC-1000 TOP2 <- -> JIG 11pin Connection
iv) Checking b-LAN MAC Address
Check whether it is same their address numbers or not
between b-LAN Label and on the pc address numbers.
※
Checking JIG contents
(1) Check whether displaying all “Pass” or not at the number
3.4.6.7.9 contents of UTC-1000 on the PC
(2) Check “Version 6.27” of the 1. b-LAN Application version
(3) Check whether it is same their address numbers or not
between b-LAN Label and
(4) MAC Address on the pc.
6.6. Ship-out mode check (In-stop)
▪ After final inspection, press In-Stop key of the Adj. R/C and
check that the unit goes to Stand-by mode
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7. AUDIO output check
7.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
(3) RGB PC: 1KHz sine wave signal (0.7Vrms)
7.2. Specification
No
Item
Min
Typ Max Unit
Remark
1
Audio
practical
max Output,
L/R
9.0
8.5
10.0
8.9
12.0
9.9
W
Vrms
(1) Measurement
condition
- EQ/AVL/Clear
Voice: Off
(2) Speaker (8Ω
Impedance)
8. GND and HI-POT Test
8.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
8.2. GND & HI-POT auto-check
(1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test).
(Remove A/V CORD from A/V JACK BOX)
(5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next process
automatically.
8.3. Checkpoint
(1) Test voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
(2) TEST time: 1 second
(3) TEST POINT
- GND Test = POWER CORD GND and SIGNAL CABLE GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5mArms
9. USB S/W Download
(Optional, Service only)
(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 Lower,
it didn’t work. But your downloaded version is Higher, USB
data is automatically detecting
(Download Version High & Power only mode, Set is
automatically Download)
(3) Show the message “Copying files from memory”
(4) Updating is staring
(5) Updating 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 controller.
(2) Select "Tool Option 1" and Push “OK” button.
(3) Punch in the number. (Each model has their number.)
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10. Optional adjustments
10.1. Manual ADC Calibration
10.1.1. Equipment & Condition
(1) Adjustment Remocon
(2) 801GF (802B, 802F, 802R) or MSPG925FA Pattern
Generator
- Resolution : 480i Comp1 (MSPG-925FA: model-209,
pattern-65)
- Resolution : 1080p Comp1 (MSPG-925FA: model-225,
pattern-65)
- Resolution : 1080p RGB (MSPG-925FA: model-225,
pattern-65)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
10.1.2. Adjust method
8.1.2.1 ADC 480i/1080p Comp1, RGB
(1) Check connected condition of Comp1/RGB cable to the
equipment
(2) Give a 480i Mode, Horizontal 100% Color Bar Pattern to
Comp1. (MSPG-925FA -> Model: 209, Pattern: 65)
(3) Change input mode as Component1 and picture mode as
“Standard”
(4) Press the In-start Key on the ADJ remote after at least 1
min of signal reception. Then, select 7.External ADC. And
Press OK or Right Button for going to sub menu.
(5) Press OK in Comp 480i menu
(6) Give a 1080p Mode, Horizontal 100% Color Bar Pattern to
Comp1. (MSPG-925FA -> Model: 225, Pattern: 65)
(7) Press OK in Comp 1080p menu
(8) Perform (6) and (7) in RGB-PC
(9) If ADC Comp is successful, “ADC Component Success” is
displayed. If ADC calibration is failure, “ADC Component
Fail” is displayed.
(10) If ADC calibration is failure, after rechecking ADC pattern
or condition, retry calibration
(11) If ADC RGB calibration is successful, “ADC RGB
Success” is displayed. If ADC calibration is failure, “ADC
RGB Fail” is displayed.
(12) If ADC calibration is failure, after recheck ADC pattern or
condition, retry calibration
10.2. Manual White balance Adjustment
10.2.1. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
▪ After Aging Start, Keep the Power ON status during 5
Minutes.
▪ In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
10.2.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer (During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model: 217, Pattern: 78)
10.2.3. Adjustment
(1) Set TV in Adj. mode using POWER ON
(2) Zero Calibrate the probe of Color Analyzer, then place it on
the center of LCD module within 10cm of the surface.
(3) Press ADJ key -> EZ adjust using adj. R/C -> 6. White-
Balance then press the cursor to the right (KEY►).
When KEY(►) is pressed 216 Gray internal pattern will be
displayed.
(4) One of R Gain / G Gain / B Gain should be fixed at 192,
and the rest will be lowered to meet the desired value.
(5) Adj. is performed in COOL, MEDIUM, WARM 3 modes of
color temperature.
▪ If internal pattern is not available, use RF input. In EZ Adj.
menu 6.White Balance, you can select one of 2 Test-pattern:
ON, OFF. Default is inner(ON). By selecting OFF
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