Editing C64 (section)

==Repair==

I'm trying to repair my C64. It is a PAL, ASY 250425

It black screens.

* I have tried a deadtest cart but it still blackscreens. No flashes, waited 30seconds.
* I seem to get video 'sync'. No borders. No sparkles. Just black.
* None of the chips feel particularly hot (The VIC-II's get a bit hot but afaik that's normal).
* The power supply's 5v is under 5.2v and the unregulated 9vac is around 11vac.
* The voltage regulators on the board are outputting 4.98v and 11.88v
* Removed the SID
* Removed the CIA's
* I have replaced the PLA with a PLAnkton. I also compared the output of the original with the PLAnkton and found they matched (so now I have a spare I guess)
* Replaced the VIC-II with a new one (I guess the original was fine too).
* Replaced the clock generator with a TOLB (I'm fairly sure I broke the original circuit while poking the crystal with a multimeter, chip might still be good though).
* The reset line stays low then goes high after a few secs as expected
* I am getting around 984.9 Khz clock in and out on the 6010.
* There is activity on the CPU's datapins and address lines. All of them are seen in both high and low states.
* It seems the CPU is stuck on the kernal and not loading basic.
* On the CPU '''_IRQ stays high.''' (Apparently is supposed to be 60hz if the Kernal has programmed the CPU correctly?). I have tried with the CIA's socketed and without (Someone else mentioned the CIA's generated the IRQs...).
* BA/RDY on the PLA/CPU stay high (I think the VIC-II is supposed to pull this low on badlines normally... Not sure if that is programmed via the CPU though).
* On the PLA I see CASRAM (pin17/F0) toggle on and off (it seems opposite to KERNAL which makes sense). BASIC (pin 17/F1) stays high (Maybe one brief low on power), KERNAL(P16/F2) toggling on and off continuously. CHAROM(Pin15/F3) mostly high with occasional patches of low (maybe badlines?).
* On the rom chips the KERNAL's CS signal is toggling at the CPU rate. The CHAR occasionally triggers (bad lines?). The basic stays high the entire time. With the deadtest they all stay high (which makes sense as the deadtest bypasses them).
* AEC on the 6510 toggles on/off.
* <strike>R/W on the 6510 seems to stay high (occasional very short dips, not sure it's enough to do anything).</strike>
* R/W on the 6510 seems to toggle at 984.9Khz
* CAS on the PLA toggles on/off
* Checked the traces from the RAM's to the CPU datapins. RAM's seem to show activity.
* I removed one of the RAMs and found it a nightmare to desolder (I had no problems with the 6510 and CIA). That one tested fine (surprising considering the abuse I gave it).
* Pushing the RESTORE key doesn't seem to show do on the NMI pin on the cpu with the CIA's socketed...