Firstly, hi to everyone on DS!

I recently bought a Silverscreen Trilogy 5-input Scart switch box which bears more than a little resemblance to the B-Tech Quintro.

Upon connecting it up to all my gear, I found that when the playstation or satellite receiver are powered on the Trilogy automatically switches to the correct input but caused the TV to switch into widescreen (16:9 anamorphic) mode, despite the playstation and satellite box sending 4:3 pictures.

On investigation, I discovered that with the Playstation disconnected from the Trilogy it was outputting roughly 12 volts on pin 8 of the scart lead. When plugging the scart lead into the Trilogy this was getting pulled down to about 7 volts, low enough for the Trilogy/TV to think it was sending a 6 volt "this is anamorphic" signal.

So the Trilogy was drawing too much current from the pin 8 connections of the devices it was connected to. A little dismantling and reverse engineering of the Trilogy later, I discovered that the pin 8 sensing circuitry for each scart input contains a 2700-ohm resistor - low enough to overload the output circuitry in the Playstation and satellite box.

After some experimentation I found that replacing or adding to the 2k7 resistors cured the widescreen detection problem, and still allowed 'official' widescreen switching by my other devices - SetPal freeview box and Toshiba DVD player.

I found that anything from an additional 4k to 10k resistor soldered in series with the 2k7 allowed sufficient buffering of the pin 8 signal. You can either just desolder one end of the 2k7 resistor, bend it up off the PCB and solder a 10k into the empty hole, then solder the two resistors together in series, or completely replace the 2k7 with a 10k.

This picture shows a close up of a 2k7 resistor with its red-violet-red identifying bands:
http://robskillz.fastmail.fm/images/...-robskillz.jpg

This picture shows the main PCB of the Trilogy and the general locations of the five 2k7 resistors. As can be seen, some I just added a 10k in series, others I replaced the 2k7 with a 10k:
http://robskillz.fastmail.fm/images/...-robskillz.jpg

When doing any soldering on this PCB be very careful as the pads seem to lift much more easily than any other board I've tinkered with.

As a side-effect, this mod also cured the interference I was getting on my SetPal freeview box every time the screen changed ratio. I think the extra current drain of the Trilogy was causing the SetPal to freak out!

Hope this is of help to someone.
Robskillz