[time-nuts] iCruze Monitor Dead

Brooke Clarke brooke at pacific.net
Sat Apr 3 11:28:44 EDT 2010


Hi Niels:

See my prior post, it's fixed.  The small PCB has a header connecting it 
to the main iCruze board that's soldered on both boards so it's 
difficult to see the component side of the small board.  My unit has the 
78D05 regulator on the small board near where the wires are soldered to 
it and so needs +12 volt input.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Niels Lueddecke wrote:
> Hi!
>
> According to its datasheet the 8051 used by ko4bb is a 3.3V
> part and there is a 3 pin part on fluke's pcb. This ought to
> be a 3.3V linear regulator. The regulator should not die
> at 6V, so the 8051 behind it should be fine too...
>
> The LCD runs at 5V directly from power supply input.
>
> Some (most?) display controllers show lines of black squares
> when powered up and before initialised by a µcontroller.
>
> You don't see anything on the display, so best guess is the
> lcd controller (under that black stuff) is fried. :(
>
> A picture of the component side of fluke's pcb might reveal
> some other parts too, but i doubt it.
>
> Maybe you can buy another cheap icruze and exchange the new
> small pcb?
>
> Hope you hava a nice day anyway!
>
> -------- Original-Nachricht --------
>    
>> Datum: Fri, 02 Apr 2010 16:31:21 -0700
>> Von: Brooke Clarke<brooke at pacific.net>
>> An: Discussion of precise time and frequency measurement<time-nuts at febo.com>
>> Betreff: Re: [time-nuts] iCruze Monitor Dead
>>      
>    
>> Hi Niels:
>>
>> No, only the back light is on.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>>
>>
>> Niels Lueddecke wrote:
>>      
>>> Hi!
>>>
>>> Is the display showing anything?
>>> Like a line of black squares and a blank one?
>>>
>>> You could have a look at the data lines of the display
>>> to see if anything happens or if they all show the same
>>> level all the time.
>>>
>>> Are the logic lines at roughly 5V or 0V?
>>> Or somewhere in between?
>>>
>>> A picture of the component side of the small pcb could provide
>>> clues too.
>>>
>>> Good luck!
>>>
>>> -------- Original-Nachricht --------
>>>
>>>        
>>>> Datum: Fri, 02 Apr 2010 14:42:19 -0700
>>>> Von: Brooke Clarke<brooke at pacific.net>
>>>> An: Discussion of precise time and frequency
>>>>          
>> measurement<time-nuts at febo.com>
>>      
>>>> Betreff: [time-nuts] iCruze Monitor Dead
>>>>
>>>>          
>>>
>>>        
>>>> Hi:
>>>>
>>>> While updating my web page:
>>>> http://www.prc68.com/I/ThunderBolt.shtml#iCruze
>>>> The monitor has died.  Maybe because the knob on the +5 got bumped to 6
>>>> VDC.
>>>> Is there any troubleshooting info on it?
>>>>
>>>> -- 
>>>> Have Fun,
>>>>
>>>> Brooke Clarke
>>>> http://www.PRC68.com
>>>>
>>>>
>>>>
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>>>>          
>>>
>>>        
>>
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>    
>
>
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