🚀 go-pugleaf

On Wed, 9 Jul 2008 10:41:59 -0700 (PDT), Robert Petras
<robert.petras@arcor.de> put finger to keyboard and composed:

>Franc Zabkar wrote:
>> BTW, Grundig Australia's service rep (United Electrical Engineering
>> Pty Ltd) didn't want to know me. I was told that they didn't support
>> old CRT sets. Instead I was advised to contact Grundig directly.
>>
>> BTW, I have no idea who is the service agent for Blaupunkt TVs in
>> Australia. I have basically given up looking for them.
>
>You won't get lucky trying to get technical assistance from Grundig on
>sets that old. The former Grundig company of Fuerth, Germany has been
>bankrupt and the name - not the knowledge and quality of service/
>design - sold some years ago. What nowadays goes by the name "Grundig"
>is not worth the bandwith wasted writing about it. And Blaupunkt
>dropped out of the TV segment almost decades ago, after all they
>mostly rebadged Grundig Chassis. So there is no use trying to get any
>info from either of them.
>
>What you have there is some fine machine from the good old days, and I
>am really sorry I have no info on that particular IF module, since
>I've never seen AUS sets. The 29504-102 PAL BG IF Module with german
>type 5.5/5.74MHz Subcarrier (Not NICAM) Stereo decoding based on
>TDA6611-2 is depicted in the CUC5510/11 schematic (DL-able on
>eserviceinfo). Maybe this will help some.

Thanks. I had already downloaded the datasheet for the TDA6612-5 and
managed to work out the general function.

>Unfortunately this set does not have the well known washer contact at
>the mains switch that regularly caused audio mute problems in earlier
>Grundig models. So it's other problems you will have to look into.
>
>With CUC6330 you may try this:
>Since the IF Module is not the same as in the German models I know,
>get the Datasheet for TDA6612-5 from alldatasheet.com and see if you
>can scope something on the input of this IC the way it is coming from
>the U2840 - so you rule out the U2840.
>Try Scart AV.
>Generally with any of these sets scope the I2C at the TDA6612 to see
>if a level of 5V is reached when the SDA SCL line is being released,
>and the edges on the Hi-Lo Lo-Hi transitions are not too sloped.
>
>The test I used for IC like TDA66xx/6200/TY45018 etc used in Grundigs
>and similar sets whenever swaping the module was not an option, is to
>take the chip off the bus and attach a I2C monitoring/control software
>like IICUNI.EXE ...

Thanks, that's brilliant stuff. I was thinking about hooking up my
module to my PC's SMBus and using one of my hardware monitoring
utilities to scan for it, but this is so much better.

BTW, I managed to find IICUNI here:
http://web.archive.org/web/20060511013214/sterr.narod.ru/progs/iicuni.rar

>... with its simple hardware interface to the chip and see
>if the chip does respond to the address probe command of the software.
>I found most of the time one of these chips are gone (mostly due to
>arcover from tripler/DST), they are gone for good and won't even
>respond to their address being called.

>BTW Since TDA6612 controls the volume and source selection like
>TDA6611, I suspect it to mute the sound unless it is initialized via
>I2C,- just like the TDA6611 and TY45018 etc generally do. So I
>wouldn't expect taking the TDA6612 off the BUS would do any good
>unless you init it manually via some dongle/software using the
>commands from the datasheet.
>
>Sadly as with most of these models the spare part plus labor is mostly
>beyond the limit of most customers.
>
>-regards, Robert

I'll probably continue working on it as an intellectual exercise.
IICUNI has sparked my interest. In the meantime Bush Australia are
chasing the part for me. However they want a Grundig *model* number -
apparently the Grundig *chassis* number was not sufficient. <shrug>

- Franc Zabkar
-- 
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