FAQ about Lonsdor K518 series hardware

Here we've collected maintenance solutions to some common problems of Lonsdor K518(K518ISE) Key Programmer. Read this article may help to fix those small issues.

1. For those cannot connect to vehiclesorcause fault codes tovehicles

Solution:

Power off the K518 device(K518ISE or K518S) and plug in the original power cable, thentest the voltage of each pin of the cable. The voltage of each pin is about1.5V to 3.5V (except cathode and power). If there is any pin of 5V to 12V(except power), probably there is a short circuit of some channel in thedevice. Remove those chips in Position U104, U105 and U103 in Picture 1(marked as Position 1 and 2) and check whether the voltage is normal ornot. If yes, theproblem is in those chips (Position U104, U105 and U103).If there is any pin of no voltage (except cathode), check whether the OBDcable works well first. If the cable works well, check whether there isbreakdown of No.ADG1406 in Position U107 and U108 and change chipsin corresponding positions.

Chips will be burnt out due to improper operation and unstable voltageor current of vehicles. We need to alter the channel to avoid burningchips out. Power off the device and cut off the power first (showed inPicture 5), then take away the battery and the loudspeaker. Take awayscrews and loosen the socket. Take out the motherboard and put it in aninsulated place. Remove chips in Position U104, U105 and U103 andcapacitance (showed in Picture 1) (marked as Position 1 and 2). Use ablade to cut the circuit in Position A and B (the first pin from the left inPosition U108 and U109). Do not cut off too much. Do not cut out offPosition A and B (Do not cut the pins of the chip.).

After that, the boardwill show as Picture 2. Weld a diode (No. 1N5819HW) in Position A. Weldthe cathode of the diode to the pin of the chip. Then use an electric wireto connect the first pin of U108 and U107. We need to cut the circuit inPosition C to cut off the power of vehicles, because the power of vehiclescomes straightly to this part via OBD. Picture 3 is the back of the PCBboard. The channel also needs to be altered. Use a soldering iron to weldPosition D and E, then the power of vehicles comes through Position E.

After welding, use a multimeter to check whether there is a short circuitin Position F in Picture 4 and Position D in Picture 3. If yes, the circuit isnot well cut. Then use a multimeter to check whether Position G inPicture 4 and Position D in Picture 3 are well connected. If not, Position Dand E in Picture 3 are not well welding; or the electric wire is broken.

After that, check whether the voltage of each outlet is normal. Do notcut other components when operating. Ask for remote guidance if youhave any questions.

2. For those which cannot charge issue

Solution:

• Check whether the power cable is theoriginal cable;
• Check whether 12V power output is normal;
• Checkwhether there is breakdown of No.FR9888 in Position U127, No.RRH050PO30in Position U130 and No.150F/24-2 in Position F102 andF101.

3. For those which show “fault9FFF”/ “fault31” or cannotpower on

Solution:

Return to your Lonsdor seller for repair.

4. For those which power on automatically once the power cable is pluggedin

Solution:

Power on and off the device, then charge it for two hours. Checkwhether the charger can put an amount of charge into the device. If not,check whether the battery port in Position CN37 is loose or change abattery.

5. For those that screens get stuck

Solution:

• Insert the screen flex cable in PositionCN6;
• Check whether No. GSL1680 in Position U25 or the touch screen isbroken.

6. For those which cannot open WIFI

Solution: Change WIFI module (No.RL-UM12BS-RTL8188EUS).

7. For those that have blurred screens ordisplay is not normal

Solution: Change the touch screen.

8. For those which cannot recognize chips

Solution:

• Check whether the coil and theflex cable of RFID board are loose;
• Check No.PCF7991AT in Position U7and No.TMS3705A in Position U6 are broken.

9. For those which cannotdetect remotes

Solution:Check whether No.MB506 in Position U5 is broken.

10. For those that buttons do not work

Solution:Check whether the button flex cableis loose.

11. For those which cannot recognize USB or SD card

Solution:Checkwhether the slot in corresponding position is poor contact.

12. For those which cannot connect to the adapter

Solution:Check whether the cable works well.

13. For thosewhich show code “31” error

Solution:Return to your Lonsdor seller for repair.

14. For those that have no sound or have much noise

Solution:

• Check whether theloudspeaker cable in Position CN2 is loose;
• Check whether theloudspeaker is broken.

Attention:

1. All solutions above is for customers who can repair the Lonsdor K518 on theirown. Those who cannot repair the device, please do not operate bythemselves.
2. Please use the original cable. Do not plug in a converted cable or a cableof another equipment. This may cause serious problems to the devicethat cannot be repaired.
3. Plug out the power cable and power off the device before repair. Do nottouch othercomponents when you are changing some chip. Put themotherboard in an insulated place when you are changing the touchscreen. The screen cannot touch the motherboard when you areinstalling the screen. Otherwise it will cause a short circuit (showed asPicture 7). Use insulated tape to separate the motherboard, the screenand screws. Do not touch the area marked in red (showed as Picture 6and 8), otherwise it will cause “fault31” or “fault9FFF”.

4. Check whether each functions of the device works well or not afterrepair. Check whether 12V power output is normal or not.
5. For those that cannot be repaired by solutions above, return to China forrepair.

6 The article is forcustomers’ convenience. Please do notdetect and study the device when repairing. Or you are responsible for aseries of issues that arise. There will be accountability in seriousconditions.

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