TPS900 repair user guided V1.0
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3.3 Turn off after loosen the power on key
If press and hold on the power on key, it can turn on the POS. But after loosen the power on
key, it turn off immediately. Please try to reload the firmware.
3.4 LCD display color changes appear obvious ladder
The color shows on the LCD screen appear obvious ladder.
1)
Check the cable which connects the LCD to the mainboard is connected well or not. Try
to disconnect it first, then connect it again.
2)
Maybe the wireless Module’ Pins which connect to the LCD are soldered false. Try to
resolder the Pins again.
3)
Replace the LCD screen.
4)
If still the issue, try to replace the mainboard.
3.5 Do not detected SIM CARD
Install the SIM CARD. Turn on the POS.
If it shows this icon on the status bar, it means that it does not detect the SIM card.
If so, please check followings:
