Author Topic: Tandberg TT1200 DVB MPEG-2 Decoder Teardown  (Read 143 times)

Offline Mads Barnkob

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Tandberg TT1200 DVB MPEG-2 Decoder Teardown
« on: September 11, 2021, 02:30:48 PM »
Teardown of some old and discarded DVB MPEG-2 Decoders that have been used in a large buildings distributed TV network. Despite that units look the same on the outside, they turned out to be very different hardware revisions on the inside.

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The front of the Tandberg unit only has a display and 4 input keys. At the backside there is coaxial signal input, card reader, RS232, audio and video outputs.



The old unit is built up with a mainboard that has a connector for a backplane, on which 4 cards are mounted. The newer Tandberg has a main CPU, which is a Xilinx XC4013 FPGA with a 27 MHz crystal sitting next to it. The C-CUBE AViA-DMX provide one end of a highly integrated MPEG-2 transport chipset. The STi3520ACV is a MPEG Audio / MPEG-2 Video Integrated Decoder. All the following cards are just made into one board on the newer units.



The power supply is pretty standard on the input in the right side of the picture. Bridge rectifier with common mode noise filter, capacitors and a fuse. The primary side of the transformers are driven by single transistors, which sit on a live heat sink! The output seems to be at-least two different voltages, red/black is the high power main source and the other 3 are likely 2 different lower voltages for different CPUs.



The input signal card has its own dedicated 7805, 5V regulator with a large heat sink. The shielded analog-to-digital ADC conversion goes into a unknown Philips IC with a 16 MHz and 61 MHz crystal sitting next to it. The VLSI VY27065 is a Satellite DVB IC of unknown function and the VLSI VES5453 Satellite FEC COMATLAS is a Forward Error Correction Decoder.




Besides the cardreader plastic enclosure, the large IC really stealing all the attention here is the DiviCom DMX-2000+  MPEG-2 TRANSPORT DEMUX IC. There is also a Xilinx XC3142 FPGA with 27 MHz crystal and a good oldschool Motorola MC68ECO20 microcontroller which most likely runs the very old cardreader software. The amount of different MPEG-2 decoders in this products makes me think that a lot of jobs are done twice or three times, in different places, instead of treating all data in a central CPU.



The output card has two  Xilinx XC3142 FPGAs near the backplane connector. The  STi3500ACV is only a video decoder IC, unlike the 3520 we saw above that is both video/audio. The Texas Instruments TMS320AV110 MPEG audio decoder supports all ISO-MPEG audio decompression algorithm. The audio output is served by a Philips TDA1305T, where you can almost always recognize a audio IC by the TDA start, its a stereo 1fs data input up-sampling filter with bitstream continuous dual DAC (BCC-DAC2)

« Last Edit: September 11, 2021, 02:51:15 PM by Mads Barnkob »
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Offline petespaco

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Re: Tandberg TT1200 DVB MPEG-2 Decoder Teardown
« Reply #1 on: September 12, 2021, 02:01:59 AM »
Would it be worthwhile to extract the power supply (s) for bench use?

Offline Da_Stier

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Re: Tandberg TT1200 DVB MPEG-2 Decoder Teardown
« Reply #2 on: September 12, 2021, 04:32:27 PM »
Interesting look, thanks Mads.

It is quite interesting, how the internals of your Tandberg units differ.
I got a few of these units over the years and they were also pretty different in architecture and also in quality.
Some seem to use the cheapest parts possible, just like a cheap consumer receiver, while some seem to be quite overbuilt and made to last.

I always hoped for some interesting RF stuff but was always dissapointed to see that they just use a simple consumer RF tuner.

@ petespaco Sure, if you have a need for constant 5V, plus and or minus 12V, 24V and some clean linear rails, you can reuse these supplies.
Since most people have some sort of modified ATX supply for easy 5V and 12V, something like this is a nice alternative.
On the other hand there is nothing special about these supplies, since basically any switchmode supply with multiple output rails will do the same thing.


Here are some pictures from a Blankom unit I have. Since this one has a rather uncommon 50Ohm RF input, I hoped for some discrete RF circuitry.
However it still uses a normal 75Ohm tuner with some input matching networks.
It is however one of the nicer and more capable units with several output options including SDI.

















Greetings,
Michael

Offline Mads Barnkob

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Re: Tandberg TT1200 DVB MPEG-2 Decoder Teardown
« Reply #3 on: September 12, 2021, 06:42:03 PM »
Would it be worthwhile to extract the power supply (s) for bench use?

I left the power supplies in the enclosures, as that makes it a good ready made part with mains plug, filter, earthing and it all.

Thanks for sharing your unit Michael, as I mentioned in my video, the conversion from analog to digital was such a huge market, everyone jumped in and making it cheaper was just more profit :)
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Re: Tandberg TT1200 DVB MPEG-2 Decoder Teardown
« Reply #3 on: September 12, 2021, 06:42:03 PM »

 


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