Telpo TPS900 Installation guide

TPS900

FAQ

Company: GUANGDONG TELEPOWER COMMUNICATION TECHNOLOGY CO. LTD.

Address: 5/F,Zonghe Building, Hantian Technology Town,Guiping RD,Nanhai District,Foshan

City,Guangdong,China（528251）

Telephone: 0086-757-86227898 Fax: 0086-757-86323369

Web: http://www.telpo.com.cn/

Email: business@telpo.com

Date：

2018-7-13

Version：

V1.1

 TPS900 repair user guided V1.0 
 

 
Contents 
Disassemble the device.............................................................................................................2 
Base checking method ..............................................................................................................3 
Maintenance cases........................................................................................................................4 
1. CAN NOT POWER ON..............................................................................................................4 
2 Can not access Android system...........................................................................................4 
3 Turn off after loosen the power on key...............................................................................5 
4 LCD display color changes appear obvious ladder ..............................................................5 
5 Do not detected SIM CARD .................................................................................................5 
6. Do not detected the wireless module................................................................................6 
7 Can not shown the wireless signal......................................................................................6 
8 Wireless data connection not work ....................................................................................7 
9 Camera does not open........................................................................................................8 
10 NFC can not open..............................................................................................................9 
11 Touch screen not work....................................................................................................10 
12 Can not charge battery....................................................................................................11 
13 WIFI not working.............................................................................................................12 
14 Print issue........................................................................................................................12 
15 Speaker issue...................................................................................................................14 
 
 
 
 
 
 
 
 
 
 

TPS900 repair user guided V1.0

1.How to disassemble the device

1. First, Remove the printer cover

2．Unlock the 6 screws

TPS900 repair user guided V1.0

3．Open the shell

Then open the shell with the Disassemble rods like this way

2.Base checking method

Base checking method:

Elimination method：Cross test method

Test every function module with Cross test method and locate where the fault in.

Temperature judgment method：Turn on the POS for a moment. Touch every main IC or the

circuit board with hand. Check if there is any IC or circuit board overheating.

Consolidation method：If you guess the faulty maybe is caused by the solder false, please

TPS900 repair user guided V1.0

re-solder it to eliminate the hidden issue.

3. Maintenance cases

3.1. CAN NOT POWER ON

Mainly there are following power on issue:

1. It has not any response on the screen after press the power on key.

2. After press power key, it show “Android”on the screen, but do not go a head.

3. After turn on, it reboot itself automatically.

Checking:

1) It must install the battery. Otherwise, it can not power on.

2) Check the energy of the battery is used out or not. Try to charge the battery for some time

for example 1-2 hours.

3) Replace the battery with a normal one to test it.

4) Check the power on key, Volume key and function key. Maybe one or two keys are embed in

the device and lead to the key is always touched.

5) Check the battery connecting PINs are ok or not. Maybe some PINs become broken. Or the

connector becomes loose. If so, it needs to solder the connector.

6) If all above status are ok, try to reload the firmware with QFIL tool.

7) If still has the issue, please try to replace the mainboard.

3.2 Can not access Android system

After press the power on key, it can show the “Android”. But it can not startup the Android

system normally, then stopped or reboot itself.

1) Check the energy the battery is used out or not. Try to charge the battery for some time

2) Try to reload the firmware.

3) Try to re-solder every Pins of the wireless Module.

4) Try to change the mainboard with another normal one to test it.

TPS900 repair user guided V1.0

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:

TPS900 repair user guided V1.0

a). Check the installation of the SIM card

Check whether the SIM card is installed well or not. Try to install the SIM card

again.

b). Check the direction of the SIM card.

Check whether the installation direction of the SIM card is correct or not. If not,

install again.

c). Check the SIM CARD slot.

Check whether the SIM CARD slot is normal or not.

d). Scratch the metal spring of the SIM card slot.

Maybe the surface of the metal spring becomes oxidation. Try to scratch the

metal spring of the SIM card slot with knife.

If it detected the SIM card, it will show like that:

3.6. Do not detected the wireless module

Do not install the SIM CARD. Turn on the device. Enter into Settings->About

Phone->Status

If the “Baseband version” is blank or Unknow, it means that the device can not detect

the wireless module.

1. Try to reload the firmware.

2. Try to re-solder every Pins of the wireless Module.

3. Try to change the mainboard with another normal one to test it.

3.7 Can not shown the wireless signal

If it does not show the wireless signal, maybe it will show like this:

It can detect the SIM card, but it can not register to the wireless network.

Please check:

a). If the SIM card is valid. If not, replace another valid SIM card.

b). check if the band of the SIM card is according with the band of the TPS900 device.

If not, please replace another service provider SIM card.

c). If it still has issue, Check the antenna is installed well or not.

d). Check whether the device can detect the wireless module or not.

d). Check the wireless Signal strength and Service state

Settings->“About Phone” ->”Status”-> “SIM Status” .

Check the signal strength is normal or not.

TPS900 repair user guided V1.0

If the Service state is “In service”, it is normal.

3.8 Wireless data connection not work

a). Enable the date usage option

Settings->Data usage

Select the service provider name.

Enable the “Cellular data”option.

b). If it still can not connect to data usage, please check followings.

Check the Mobile network state.

Settings->“More…” ->”Cellular Networks”

TPS900 repair user guided V1.0

Click “Preferred network”to select the proper network. You’d better ask the SIM

service provider which network is the preferred network.

Click “Preferred network type”to select the proper network type, for example,

Global or others. You’d better ask the SIM service provider which network type is the

preferred network type. If you are not sure, you can select “Global ”.

Click “Access Point Names”to select the correct Access Point Name. Generally, it

need set APN manually.

Or, try to Click “Network operators”to search the network again, and select the

proper network.

3.9 Camera does not open

1) Try to reboot the POS.

2) Try to re-load the firmware.

3) Check the cable which connects the camera to the mainboard. Or try to disconnect the

cable, and check if the connector has any false. And clean the cable and the connector.

Then connect the cable again carefully.

TPS900 repair user guided V1.0

4) Try to replace the camera.

3.10 NFC can not open

1) Try to disable the NFC option first, then, enable the NFC option again.

2) Please test it with Telpo’s Demo app.

3) Try to open the battery cover, and remove the battery, wait for a moment,

install the battery again. Turn on the POS.

4) If you enabled the USB debugging option, please disable USB debugging

option first, then test it again.

5) If still the same issue, try to reload the firmware.

6) Check the black cable which connects the NFC to the mainboard. Or try to

disconnect it first, and connect it again carefully

7) Check the NFC antenna is ok or not.

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