50PT490-UC (CHASSIS:PU11L) - LG TV Service Manual (repair manual). Page 12

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10-3. Temperature Threshold
V
Threshold Down Low
20
V
Threshold Up Low
23
V
Threshold Down High 70
V
Threshold Up High
75
11. Touch Pen Operating check 
(Pen touch model only)
(1) Press Pen mode hot key to insert check mode in POWER
ONLY condition. 
(Green Pen mode key on center of remocon)
(2) Pen check mode 
: You can see a 2X5 matrix. 
(Checker have to use right-hand.)
(3) 2X5 Matrix construction : When the screen is divided by
fixel in 16:9, matrix is applicable 14th,15th fixel in row, 3rd
~ 7th fixel in colume. And they are numbered from 1 to 10. 
(TV & Jig Monitor is numbered samely.)
(4) When checker touched a box numbered 3 of Pen touch
TV, same box of JIG monitor blinks three times.    
12. USB DOWNLOAD 
(*.epk file download)
V
Put the USB Stick to the USB socket
V
Press Menu key, and move OPTION 
V
Press “FAV” Press 7 times.
V
Select download file (epk file)
V
After download is finished, remove the USB stick.
Press “IN-START” key of ADJ remote control, check the
S/W version.
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