LG 86UH5C Service Manual page 17

6. GND and HI-POT Test
6.1 Method
1) GND & HI-POT auto-check preparation
- Check the Power Cable and Signal Cable insertion condi-
tion.
2) GND & HI-POT auto-check
a. P allet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
b. Connect the AV JACK Tester.
c. Controller (GWS103-4) on.
d. GND Test (Auto)
- If Test is failed, Buzzer operates.
- I f Test is passed, execute next process (Hi-pot test). (Re-
move A/V CORD from A/V JACK BOX)
e. HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- I f Test is passed, GOOD Lamp on and move to next process
automatically
6.2 Check Point
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
7. Audio Output Check
No. Item Min
Audio practi-
9
cal max
Output, L/R
1
(Distor-
7.3
tion=10%
max Output)
Speaker
2 (6Ω Imped- 9
ance)
8. USB S/W Download (option, Ser-
vice 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 starting.
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Typ Max Unit
10 12 W
EQ Off
AVL Off
7.7 8.5 rms
Clear Voice Off
EQ On
10 12 W AVL On
Clear Voice On
5) Updating Completed, The Signage Set will restart automati-
cally
6) If your SIGNAGE SET is turned on, check your updated
version and Tool option. (explain the Tool option, next
stage)
* If downloading version is more high than your SIGNAGE
SET have, SIGNAGE SET 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" button.
3) Punch in the number. (Each model has their number.)
9. Optional adjustments
9.1. Manual White balance Adjustment
9.1.1. 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) P robe 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 Min-
utes.
- In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
9.1.2. Equipment
1) C olor 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/204-Gray
(Model: 217, Pattern: 49)
9.1.3. Adjustment
1) Set 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) O ne 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.
▪ I f 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, you can
adjust using RF signal in 216 Gray pattern.
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LGE Internal Use Only