On 10/22/2012 8:18 AM, Linards Ticmanis wrote:
Ok, I know it is stupid to send follow-ups to your own posts... but... I just found out that there is a multi-system decoder chip that you can put into the 1084 PCB as well, as it's pin compatible with the NTSC or PAL specific chip that's in there. Then all you need is a little switch thing, and poof multi system compatibility. I'll report on my results as soon as I have some - in case anybody is interested.
The 1084 schematics that I have shows a TDA4570 NTSC decoder chip. The PAL equivalent is probably TDA4510 that is pin compatible.
Now the multi-system TDA4555 is "pin sequence compatible" but is a 28 pin chip while TDA4510 is 16 pin. The TDA4555 is a nice chip and it can be either forced into a particular color system mode or can detect it automatically.
I have just found this: http://obsoletetellyemuseum.blogspot.com/2012/08/schaub-lorenz-itt-8838-i-chassis.htmlA TDA4510 is populated for PAL only while the board is clearly designed to accommodate a TDA4555. In addition to a second crystal for 2*3.58 =7.14 MHz one also needs to switch the filter from 4.43 to 3.58.
This is not hard to do for someone comfortable with a soldering iron, but using an external decoder like the one you found in the previous message is probably lower risk.
-Alex.