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(new pic posted, please help) Cairns Viper, self-heating, some other questions

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--- Quote from: Bill W on October 07, 2021, 04:35:05 pm ---Now need to find where pins 2, 3, 5 and 6 come from.

--- End quote ---
Thank you for help.
Please look at the picture and tell me what to do next.


As no one has responded yet, I will comment.

Well done for tracing the interconnections in the H Bridge that drives the Peltier Element  :-+

Now the bad news. Diagnosing a fault and tasking another person to do diagnostic tests remotely is very challenging and time consuming. I have had a lot of experience of doing this and sadly stopped taking on such tasks some time ago as a diagnostic that would take me less than 15 minutes with the patient on the bench was taking hours of my time via messages to someone else doing the work. This is likely why you had limited responses to your request for help with this camera. Without schematic diagrams, working on thermal imaging cameras can be very challenging. I address that issue with complex faults by reverse engineering the area of the camera that I believe contains the fault. This is a time consuming task but is sometimes justified in time saved by not stumbling around a PCB in the dark looking for faulty components.

You have begun the process of reverse engineering the Peltier element control circuit but, alas, there is more work to do. Once the interconnections of the various components have been established, a proper schematic diagram needs to be drawn to provide a simple and clear picture of the circuits operation. The Peltier driver H Bridge is the output drive section of the Peltier Element controller. There will be control signals or voltage levels coming from other components on the PCB and it is important to reverse engineer that area of the design as well as that may well be where the issue with your camera resides.

Repairing thermal cameras is not a simple task for anyone not experienced in electronics repair and PCB reverse engineering. It can take a long time to build up the knowledge required to do it efficiently. It is certainly not a technology on which to ‘cut your teeth’ as no schematics are available. By comparison, repairing a laptop PC is relatively simple as schematic diagrams have often found their way into the public domain.

I am sorry that I cannot move forward with you on this repair adventure but I just do not have the spare time at the moment.



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