NewLine TRUTOUCH VN Series User manual

VN Series
Service Manual

VN Service Manual
Safety Notice
1. There are many electrical and mechanical parts in the TRUTOUCH VN Series interactive
display. Pay attention and take safety precautionsbefore repairing the display.
2. It is essential that all components be replaced with authorized components recommended
in this manual to prevent shock, fire, or any other hazards.
3. Please do not modifythe original mechanicalor electrical design without previous verification
from the manufacturer or authorized agent.
4. Before starting a repair or disassembling the display, please make sure to unplug the
display from any power source.

VN Service Manual
Part A. PCBA Overviews
OPS Dock board
Mainboard
Power board
TempSensor
T-con board
Wifi module
Front port board
AC board

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Page: 9 / 27
1. Mainboard wiring
AC board
Front port board
IR mainboard
Powerboard
T-Con board
T-Con board
Front port board
L & R Speaker s
OPS docking board
OPS docking board
Wifi module

VN Service Manual

VN Service Manual
2. Powerboard wiring
3. OPS docking board wiring
Mainboard
Mainboard
Powreboard
OC backlight
OPS docking
board
Mainboard
AC switch board

VN Service Manual
4. Wifi module wiring
5. AC Switch board wiring
Mainboard
Antenna
Powerboard
Mainboard
TempSensor pcb
Hard Reset button

VN Service Manual
6. Front port board wiring
7. TempSensor PCBA wiring
8. T-CON board wiring
AC switch board
Mainboard
Mainboard
Mainboard
Mainboard
OC PCBA
OC PCBA
OC PCBA
OC PCBA

VN Service Manual

VN Service Manual
Part B. Replace IR Touch Panel Sensor PCBAs
VN65:
VN75:

VN Service Manual
VN86:
Step 1: Place the display on a flat table and open the 4 corner covers.

VN Service Manual
Step 2. Use a thin screwdriver or pen to push and disconnect the PCBAs in the corner.
Then take out the disconnected PCBA according to below red marked directions.

VN Service Manual
Step 3. Take the new IR PCBA SET and, using the IR PCBA Layout, confirm the position in
the 4 frames for every piece of the PCBA and insert according to the below red marked
directions.
PCBA identification:

VN Service Manual
Make sure every piece of the PCBA is connected securely and has no loose connection.
Step 4. Connect the corner PCBAs pins. Usually you will need 2 people to connect this, one
person to move the contact pins and pin slot, one person to push the PCBA in on another
side to make the contact pins go securely into the pin slot.
Step 5. Reassemble the 4 corner covers with the screws.

VN Service Manual
Part C. Firmware Upgrade
Step 1: Prepare a USB drive with the FAT32 format. Copy the firmware files to the root
folder of the USB drive, as shown in the following images:
Step 2: Turn off the display and connect the USB drive to the below front USB port.
Step 3: Turn on the display and the firmware upgrade will start automatically.
Step 4: When the firmware upgrade is finished, the display will restart automatically.

VN Service Manual
Step 5: Go to the Settingsmenu to check the firmware version is correct.

VN Service Manual
Part C. Trouble shooting
Problem #1: Can’t turn on machine (Power indicator always stay on red)
Problem #2: Dim screen (After turn on, the display gets an image but it is very faint and hard to see)
Problem #3: Android can’t pick up the OPS signal
Problem #4: No power (Power indicator is blank, neither green or red)
Problem #5: Partial touch or dead touch area
Problem #6: No touch
Problem #7: Ghost touch or the calibration is inaccurate
Problem #8: No image (Black screen) even no faint display
Problem #9: Noise in the image or color distortion
Problem #10: Flickering screen
Problem #11: Stuck on splash logo, can’t enter Home Screen
Problem #12: Broken sound or sound popping
Problem #13: No audio output from OPS
Problem #14: No signal from all HDMI inputs
Problem #15: Wifi module not working, can’t detect wifi signal
Problem #16: Front HDMI not working

VN Service Manual
Problem #1: Can’t turn on machine (Power indicator always stay on red)
Step 1: Replace the mainboard first.
Step 2: Replace the powerboard.
Problem #2: Dim screen (After turn on, the display get image but is very faint hard to see)
Step 1: If backlight is ON, replace the optical bonding module.
Step 2: If backlight is OFF, replace the backlight module.
Problem #3: Android can’t pick up the OPS signal
Step 1: Check if the OPS is powered on.If not, press POWER button on the OPS front panel to check
if the OPS can be powered on or not.
Step 2: Check if the OPS can work with another known-working touchscreen.If it does not, replace
the OPS.
Step 3: If there are no other touchscreens, connect the OPS via external HDMI cable to display’s rear
HDMI IN port. Ifit works, check the OPS installed the graphic card driversproperly or not. If it does
not work, install the graphic card drivers.
Step 4: Replace the mainboard.
Step 5: Replace the OPS dock board.
Problem #4: No power (Power indicator is blank even no red colour)
Step 1: Replace the Powerboard
Step 2: Replace the AC relay control board.
Step 3: Replace the Mainboard.
Problem #5: Partial touch or dead touch area
Step 1: Refer to Part Bto test the IR touch panel signal.
Step 2: According to testing results, replace one pcba sensor or replace a whole set of pcba sensors.
Problem #6: No touch
Step 1: Check if only Windows has no touch or both Windows and Android have no touch.
Step 2: If only Windows has no touch, replace mainboard and OPS docking board one by one.
Step 3: If both Windows and Android have no touch, please refer to Part Bto test the IR touch panel
signal.According to testing results, replace the TP control board at first.If still not working, send back
testing results for analysis.
Problem #7: Ghost touch or the calibration is inaccurate
Step 1: Refer to Part Bto test the IR touch panel signal.
Step 2: According to testing results, replace one pcba sensor or replace a whole set of pcba sensors.
Problem #8: No image (Black screen) even no faint display
Step 1: Unplug the power cord for 30 seconds, then plug it back in and check again.If it the display
starts with a normal image, please replace the Powerboard.

VN Service Manual
Problem #9: Noise image or colour distortion
Step 1: If only the OPS source has this issue, replace the OPS docking board or HDMI cable that
goes between the OPS docking board and the Mainboard.
Step 2: If all sources, including Android,have this issue, replace the Mainboard, T-CON board, and
LVDS cable one by one.
Step 3: Replace optical bonding module.
Problem #10: Flicker screen
Step 1: Replace Mainboard.
Step 2: Replace T-CON board and clean the FFC cable of T-CON.
Step 3: Replace optical bonding module.
Problem #11: Stuck on splash logo, can’t enter into homepage
Step 1: Reload FW for mainboard.
Step 2: If it does not work, replace Mainboard.
Problem #12: Broken sound or sound popping
Step 1: It should be a speaker issue, replace the speaker.
Problem #13: No audio output from OPS
Step 1: Install audio card drivers for the OPS.
Step 2: Right click the Speaker icon on the right side of the Windows toolbar. Select the “Audio
device” item and set “MStar Demo”speaker as the default speaker device.
Step 3: Install all OPS drivers.
Problem #16: No signal from all HDMI inputs
Step 1: Replace Mainboard.
Problem #17: Wifi module not working, can’t detect wifi signal
Step 1: Replace wifi module pcbas.
Problem #18: Front HDMI not working
Step 1: Replace Front port board.
Step 2: Replace HDMI cable between the Front port board and Mainboard.

VN Service Manual
Thank you for reading!
For more info, please contact the manufacturer or authorized agent.