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Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Thu Aug 23, 2018 6:50 pm
by thesithlord
Hi everybody,
I bought this kit and soldered it together following the manual. But today I founded the time to fire up my QL. It booted up fine - powered it of - plugged in the interface - powered it on... only hearing some crank repeating noise from one microdrive nothing happened. After a few seconds pittily I touched one of the interface chips and got nearly burned fingers...
Powered the QL of emmidatly -removed the interface board -powered on my QL -and it booted up fine *puuuuuuhhhhh*
Only 2 chips from the interface board are getting extremely hot:
the Winbond and the Samsung one, other chips incl. voltage regulator keeping cool...
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Thu Aug 23, 2018 7:06 pm
by mk79
Difficult to say without any pictures, but as a first guess either the voltage regulator is bridged, providing 9V to the chips, or the chips are mounted the wrong way round?
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Thu Aug 23, 2018 9:52 pm
by Derek_Stewart
Hi,
Can you post a photograph of each of the PCB.
There maybe shorted traces on the PCB.
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 10:29 am
by thesithlord
Well I have already checked if something is shorten etc. attached the pic's
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 10:55 am
by mk79
When I compare this to the official photo the two Atmel chips to the left seem to be exchanged (chip 1 is near the IDE port in the official photograph).
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 2:19 pm
by thesithlord
Thx, I changed them like on the picture, but I found something more interesting:
Jumper J6-J7 allows connect +9v with +5v and use QubIDE with a Qplane. CAUTION. Don't use this feature in a standard QL or you will destroy the Qubide. Read the original Qubide documentation.
on my one the jumper was set... hopefully it survived... will test it today later... *argh* damn it...
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 2:26 pm
by mk79
Well, then my first guess with the bridged voltage regulator was right after all
It depends on how long you tried, I guess the chips can take a few seconds of 9V. Good luck!
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 3:28 pm
by thesithlord
damn it...
seem's to be the chips are BBQ... screen stays black...
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 3:33 pm
by thesithlord
Re: Sinclair QL QUBIDE interface DIY kit from Tetroid getting hot and no screen
Posted: Fri Aug 24, 2018 4:25 pm
by Derek_Stewart
Hi,
Does the EEPROM come ready programmed?
I have bought kit, I will let you know how I get on.