A600 glitches after recap

[Jacksoft]

Hi all,
I encountered a strange issue during/after a recap on A600 rev. 1.5.
I've not repaired so many Amigas but fixed some 500's with minor problems.
This machine had floppy drive issue and no video on composite.
No video was caused by Z222 and I bypassed it just to make sure it works, floppy drive was recapped and now looks working' (not fully tested yet), so there's the main A600 plague, bad caps and some corroded traces.
Initially the machine worked ok, after I replaced all the capacitors (found about 4-5 ceramic caps on the 5V line in nearly short too and replaced them!) and removed Paula to check traces under the chip (some of them were "blacky") I putted all back and powered on the A600 with some ugly glitches on the half-down screen like in attached pictures.
For older machines like A500/500+ I used the Test Disk floppy but in this case, after loading the Test Disk, I could only see garbages on the screen, so I bought a DiagROM and did some tests. Most of all seems working ok, except option 1, 2, 3 in Graphics tests: it causes glitches, empty screen or no video at all. RAM, CIA, IRQ are ok, sound tests are ok.
I also tried disabling and removing Paula again (thinking about some wrong soldering or other) but nothing changed.

I've seen around that this kind of problems is caused by a bad Agnus, but I don't understand how it could be correlated the work I did.
Before starting messing anymore around and buying replacements there is some others checks and tests I can do?

Thanks in advance.

[Jacksoft]

Hi! Thanks for the fast reply.
About the ceramic caps I noticed that one under the board was very hot. I removed and tested it in Ohm and returned me about 33Ohm. But one ceramic cap in short or nearly can happens. The strange fact is that other two caps on that line where also like this (60ohm, 100ohm, etc). Also the one on the Paula alimentation (after the big 1R resistor) had trouble so he messed with the tension partitor for the 2.4V.
I removed them all and tested and about 4-5 of them where faulty (this is REALLY strange).

I'll check where you suggested and report you asap. Thanks!

[Jacksoft]

I checked around Denise, there where some blacky traces but nothing so bad.
I checked the continuity from CPU/Angus/Paula for _INT3, IPL1-2-3 and they seems good.
I checked also the _INT3 with the oscilloscope and the active (low) signal is present just during bootup but rarely when the floppy animation runs. Most of when the floppy is "full out" and the screen looks good. In the rest of the time it is always high level. Also, if I power on the machine with the probe on _INT3 most of time the screen remains white. More rarely it shows "Software failure" like in the attached picture.
I forgot to mention before (just because I just reinserted the original Kickstart ROM to do checks) that after sometimes (randomly) the screen screws up, like in attached picture.

Thanks all.

[Jacksoft]

I'll check DMAL signal tomorrow.
About U3, I already checked all (removed Paula again, cleaned pads, tested some traces by looking on amigapcb for reference) and seems ok, also redid soldering being more careful.
I'm also having suspects on Paula too, probably some ESD discarge damaged it and yes the problem happened after I removed Paula to check the blacky lines.
I usually remove big stuff at 380°C by moving the nozzle around the chip and grabbing with a pumpet to avoid using tweezer or other that could damage stuff.

Eventually I'll remove it again, recheck and take some pics to post here just for reference.

Thanks.

[Jacksoft]

I checked DMAL pin and I can see some toothsaw pulses.
I made some pictures of the Paula zone, removed it again. I'll re-do some continuity checks asap to make sure everything is ok. I would suspect, in case, of bad or little highter impedence on vias? (My multimeter have the "beeper" in diode mode, not in ohm. I'll check the impedence of the entire line too, in case).
(The green stuff on the PCB in pictures is solder mask applied with an artist brush to make sure it'll not be too thick.)