BOXLIGHT ProColor 652U, Service Manual, Page: 62 / 67

III. Touch frame issue
Touch frame issue
No touch
Is there interference
source ? (such as high
power incandescent
lamp, electromagnetic
lamp, IR light source, etc.)
Upgrade MCU firmware
and recheck
Both Android & built-in PC
have no touch ?
Solved by MCU upgrade
Touch frame power supply
normal ?
Replace TV
main board
Replace touch frame
Unplug touch cable form
touch frame. Is power
supply normal at cable end ?
Replace TV
main board
Replace
touch frame
Y
Y
N
N Y
N Y
Connect to external PC
with USB touch cable.
Touch work normally ?
Y N
N
N
Test the touch frame with QtTstPrgm tool. Replace
the touch board with broken LED or touch frame
Touch frame GND
connects to panel
N
N
Y
Y
Replace touch
cable with GND pin
N
IV. Abnormal Display (Flicker / Blurry / Black)
Abnormal Display
Check VBO board power supply. Check
cables between TV board, VBO board, and
TCON board. Normal ?
Upgrade all firmwares. Solved ? Solved by firmware upgrade
Replug or replace VBO cables
TCON PVCC power supply normal ?
Unplug TCON power cable. Is PVCC power supply normal at
cable end ?
N
Y
Enter the factory menu. Adjust display
parameters(like LVDS MAP, LVDS Ti Bit)
Solved by adjusting display parameters Y
N
N
Replace VBO board. Solved ? Replace VBO board
Replace TV main board. Solved ?
N
N
N Y
Y
Y
Y
N Y
Replace TV main board Replace Panel
Replace PSU
Is the 12V control signal of
PVCC normal ?
Replace TV
main board
N Y
Replace T-CON. Solved ?
N Y
Replace TCON Replace Panel