The too dark image is the result of the analogue levels on the R, G, B outputs being too low, and there's usually three factors involved:
1. Incorrect DAC reference voltage, though you've confirmed this is correct at 1.2V

2. If C460C or C460D has become resistive, which can happen, it will be pulling COMP (DAC pin 40) lower than expected, my service notes (attached) show this typically measures 1.7 - 2.5VDC

3. Some kind of impedance mismatch with your monitor, resulting in the R, G, B levels being excessively low, though that's unlikely given the monitor works correctly with the A500


It's not common for the DAC ICs to just 'go dim'.  They typically either work, or they don't.  And it's rare for these ICs to fail.  I've been repairing Amigas for around 30 years and I don't recall seeing a single DAC failure.

I'd suggest using my notes attached for reference, or compare with another A4000.  Pay attention to the DC level on DAC pin 40 to begin with, try removing C460C (100nF) on the bottom side and see if that makes any difference.  You may also find that heating the ceramic capacitors with hot air can temporarily 'fix' the resistive condition, which usually returns once it cools.

You could also check you have video data on all 24 digital inputs to the DAC, though that doesn't match the fault description.

But after bending all pins straight again the A2000 is back up and running again ^^

I'd suggest replacing the entire PLCC socket unless you're very confident it's perfect.  IC sockets are notorious for causing all sorts of horrible intermittent problems.

Any suggestions on other things I could do?

Depends what you want to do long term.  There are plenty of interesting options in terms of the PiStorm and Vampire expansions.

Will Now be keeping this updated over here just in-case:

https://www.amibay.com/threads/basic-guide-on-setting-up-a-prometheus-firebird-daughterboard-on-a3000-and-a4000-now-here-on-amibay.2446084/

Got, installed, tested, allf ine, thanks you!
This hard, but very interesting Trains Simulator Videogame, i even thhink this game Parents of all modern Trains Simulators!
Promised results in screenshots:
Screenshot №1:
https://forum.amiga.org/index.php?action=dlattach;topic=76470.0;attach=3402;image
Train Driver Simulator 3, Full Version, Route - Wolves&oxley, Loco 87 Lord Nelson, Speed 100 Mph, Miles 12, 3(28.04.2024)
Screenshot №2:
https://forum.amiga.org/index.php?action=dlattach;topic=76470.0;attach=3404;image
Train Driver Simulator 3, Full Version, Route - Wolves&oxley, Loco 87 Lord Nelson,Train Derailed, 4(28.04.2024)
P.S.:
This fakin verry hard, but very interesting game, also have many elements of random, when you are long drive trains on long distances, ahahahaha Bull shet, i was use many bad words, when was try drive trains from one stantions to next stantions and game always was interrupt and do random traps\limits for i lose, ahahahaha
This was very fun, lol

Looks good. Glad you have found the full version. 👍🏻

If you read my post, it says, if I were someone else. i.e. I was anticipating others telling me that it is a capacitor issue.

But in my case, I know its nothing to do with capacitors, as they are all new. Now, could it be failing resistors? Im not sure, as I am not an electronics student.

As you say, its certainly got something to do with the DAC you might assume.

Ill take a look at it, and see if anything sticks out. I do hope its NOT the chip itself, as it will be a tricky replacement,  but lets see.

If it is the Chip and you don’t want to attempt the replacement. Then give Ian a shout at mutant-caterpillar based in Anglesey North Wales.