Hi,
I just got my Indivision AGA MK3 and ran into the no-signal error which was discussed on the board here a few times already.
I installed the Indivision on the board, with no additional load (no floppy, no keyboard). The setup is listed below:
- A1200 REV 1D.4 (recapped)
- Original Commodore PSM-601-2 (25W, 5V-3A)
- DELL P1917S (tried both VGA and HDMI, for sure not simultaniously)
I cleaned the Lisa chip connectors with air and isopropyl alcohol and remounted the indivision quite a few times without any success. After reading most threads here I also took out my scope and started measuring.
As I do not have a test load for the PSU, I measured the +5V, GND on the floppy connector, while the indivision was mounted. The result shows a ripple of max. 10mv around 5.03 V, which is well within the specs (tmbk). Still, a second opinion would help.
Further I measured the 22-pin connector of the indivision. Between Pin 1 and 2 I get 4.87 V with a ripple similar to the floppy connector. The reduced voltage shall be ok, according to wiki. Unfortunetelly no other PIN has any signal against A-GND (Pin1), except Pin 15 which shows a ripple-free 4.3V constant voltage, but no sync as intended.
Important note about my setup
I do not have any analog 15khz capable monitor to test my Amiga RGB output, but sure I measured with the scope as well and got the color signals and syncs. Even the digital RGB is there. I even went a step further and decoded the Green channel recording with a Python script into an actual image, which looks quite like the expected boot screen.
On the other hand, I could already proove that my FBAS (Composite) is down. More precisely the composite outputs only the chroma signal and my (hopefully educated) guess is, that the delay line or the 1145M itself passed away. I could not find anything about it, but I do not expect any cross implication to Lisa and still, RGB is working.
I am thankful for any help.
Attachments (scope measures):