DSO5102P doesn't turn on the screen

Molina68

Hi,
My DSO5102P doesn't turn on the screen, I checked the voltages from power supply and the 3.3 volts drop to 0,7 volts.
When I disconnect from the main board, the voltage comes back to 3.3 volts again in the power supply board.
I see few LM1117 connected after it but they looks OK, any idea what to check?
Any help is appreciated,
BR//Marco

galchik22

Allow yourself to give advice-try to check all three LM1117-what they have at the exit and find the faulty one. This can be done simply with a voltmeter.

galchik22

galchik22 replied at 2018-11-27 15:44
Allow yourself to give advice-try to check all three LM1117-what they have at the exit and find the  ...

But it's probably easier to drink one by one before the appearance of 3.3 volts

galchik22

You did not try to pay attention, maybe one of 3 is heated more?

Molina68

Thanks for your comments!.
I  measured the voltage but, in all three LM1117 the input voltage is 0,7 and the output is 0 volts... also I touch with my finger is any of them is heated but all are cold...
Is it possible to get some schematic?, might be something else that is causing this drop voltage ..a capacitor?, anyway, with an schematic might be easier to track the issue..
Thanks again

galchik22

I wrote to you in PM