Products > Test Equipment
FNIRSI-1013D AS MUCH USE AS A CHOCOLATE FIREGUARD.
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Gannet:
That's fine Peter, I found loads of other info too. You say check the voltages, my goodness I can't even see the pins.  A breakout board of some kind would indeed help!
I looked at the file containing all the parts on AliExpress, some interesting stuff there I see. any particular item you'd recommend?

I have noticed that when the scope shuts down, well it doesn't, all that seems to be happening is that the display goes blank.

Is there a silk screen overlay anywhere with component Id's and locations?

Thanks

George
pcprogrammer:
Hi George,

 :-DD I have the same problem. Need a microscope to work on these things.

About the goodies on Aliexpress, it depends on your hobby. I play around with microcontrollers and well scopes, and for that the things like a CH341 programmer or a ST-Link are very handy. But availability is troublesome at the moment causing the prices to be way to high.

I will mark the measuring points for you on one of the photos I have, because there is no overlay with component numbers.

About the shutdown the 3V3 should go down to 0, but there is a small delay to allow the MCU to write settings to flash (original) or the SD card (mine)

Regards,

Peter

Edit: Attached the power supply part with voltages mentioned. VREF is not 1.25V but it is for measuring the battery level with the MCU, so it varies and is not to important. The 3V is missing on this picture, so another one is coming.

You might have to download the second image and zoom in to read the text.
Gannet:

Many thanks for the Voltage check points.

All voltages are within +0 and -160mv Peter, and with the display blank, you guessed it, all voltages are just the same, that's pointing to a bad display I guess, what do you think.

I have a display on order with a message saying 'dispatched'

Cheers

George
pcprogrammer:
You are welcome. Happy to help.

Did you check the current when the display is disconnected?

I'm no expert on displays and have no idea if what yours shows is some typical failure behavior. Guess it is wait until the new one arrives to see if it is the actual culprit.  8)

Cheers,
Peter
Gannet:
Hi Peter, I return with not so good results,
Trying to make sense of the display's that I'm getting and most appear gibberish.
I fear that there is a great deal more wrong with the scope than the display, in fact it may not be the display that is at fault after all. The washed-out colors etc could well be due to something other.
I have attached a pic of the waveform from the test point on the scope.

Maybe I should just bung it in the post and give you something to play with whilst you're not enjoying yourself.  :-DD

What do you think?

Cheers

George
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