[linux-dvb] Compro VideoMate T750

John Newbigin jnewbigin at optusnet.com.au
Fri Apr 20 11:46:28 CEST 2007

It turns out a scope is not required.  Using 
http://warmcat.com/milksop/cheapi2c.html I have successfully snooped on 
the i2c bus and hopefully this will enable me to make some progress.

I soldered some wires onto the data and clock pins of the EEPROM.  It is 
a 1.8v IC but measurements show it is running at 5v.  This allowed me to 
hook them up directly to the parallel port on a linux box to to the 
recording.  Works like a charm, and even tallies with the existing v4l 
driver code.   Now to find the differences...


John Newbigin wrote:
> I have prepared a patch with my work so far. It is not very much but 
> the card is detected. Composite video-in works, IR seems to work. dvb 
> loads but does not work. the analog tuner is NYI.
> http://www.chrysocome.net/downloads/v4l-dvb-t750-0.1.diff
> This might inspire some other card owners to help out.
> I am going to borrow a scope from work and then I should be able to 
> snoop on the i2c bus while using the windows driver. That should get 
> things moving.
> John.
> John Newbigin wrote:
>> The lid is a folded sheet of metal and soldered on at 4 points.  I 
>> stared with pliers but in then used the dremel to remove both the 
>> covers.
>> The digital tuner is:
>> Quantek QT1010 (441570113 054511DJ)
>> I am pretty use the analog tuner is:
>> Xceive XC2028ACQ
>> There are some more numbers but it is very difficult to read.  There 
>> is also a spongy thing attached to the metal case which touches the 
>> IC.  I assume it is some kind of thermal compound/heat sink.  I'll 
>> re-attach it before I fire the card back up. (lets hope it still works).
>> Henrik Beckman wrote:
>>> Open it and take a look, the lid is probably a snap on metal lid.
>>> !! Don´t blame me if you break it !!
>>> "Also, If anyone knows of a tuner which comes in the 36mm x 26mm x 5mm
>>> metal case that might help narrow down what might be inside."
>> Probably any silicon tuner will fit inside this size so I guess 
>> opening them up is the only way.
>> John.
>>> /Henrik
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