A3000 motherboard - yellow video output

[zimgr5]

Hi,
I have a problem with Amiga 3000D motherboard.
At first, there was no video at all when I was turning it on. Black screen only.
I read all (very helpful !) information at http://amiga.serveftp.net/A3000_HardwareGuide/booting-problems.html , and then, after eliminating other reasons,  I decided to exchange U180/U181 ROMS in places.
And...this partially helped. Now the screen blinks YELLOW continuously after booting.
I know, YELLOW color is shown when no daughterboard is inserted. But I have working one dtb and inserted it and ...still the same blinking yellow color.
And boot colors don't cycle through grey, white, then yellow. There is only blinking yellow color.

Do you have any idea what should be blamed for this situation ? And what should I do next ?

PSU is OK as it works with the second A3000 (working) motherboard without problem.

Thanks in advance for any help.

[Iggy_Drougge]

What does it say on the ROMs in U180 and U181? Have you tried exchanging them with the ones on your spare board?

[da9000]

So, has the battery leaked at all?