Nintendo 64 PAL – No Signal After Reassembly

dang74 Sorry to bother you, do you have any updates?

Okay, a more substantial update for you.  I took the N64 apart today.  The encoder I have is the AVDC-NUS.  I did some probing with no cartridge and no jumper pack installed.  I will add a disclaimer here.  I have an old 50MHz analog scope so these pulse trains are at the limit of scope"s capability.  In fact instead of square waves I was seeing triangular peaks.  Anyway, the pins that correspond to D0 through D3 had the same type of signal... and in my judgment their duty cycle was less than 50%.  The pins that correspond to D4 through D7 were 0V flat line.  The pin that corresponds to the SYNC signal had an AC waveform.  It's duty cycle was greater than that overserved on D0 through D3.  The pin that is supposed to be the clock had a sine wave.  I suppose it's really a square wave but due to the limitations of my scope I observed it as a sine wave.  My observations are more or less consistent with yours... it's very possible that all your electronics are fine but a poor contact with the jumper pack or cartridge is messing things up.

dang74  So, I've measured all the connector to mainboard connections and they seem fine to me... something like 0,4-1ohm (there is probes resistance in there too)

Now I'm not sure where to look...

I see some people have problems with C73 (it's the 68u near the power swtich). Mine is new, and I have checked it measure 68uf, but what do you measure with resistance mode on his pins?
I get something like 280ohms

Looks like it isn't the cartridge connector then.  I will measure the resitance across C73 and/or the capacitor near the power switch tonight.

on your working NTSC machine when the cartridge is not installed Do you still have H and V sync on the composite video signal ?

In that scenario the SYNCH signal at the input of the encoder is produced.  I did not examine what happens at the cable.

I measured the resistance across C73 and it was 283 OHMs.

That's ok too then...

Maybe I should try a crt tv, if I can find one.

Do you have activity o D4-D6 whith game and jumper pack inserted?

Okay, I will check tonight.  If you are getting activity D4-D6 that is a good sign.... and maybe an older CRT that doesn't go blue at the smallest issue can give some clues.

I'm not. That's why I'm asking if you are sure there is on yours

I was expecting that with out a cartridge you would have a composite signal on the video out put cable including vertical and horizontal sync which would produce a blank page on the tv then  Kiltro could check for the same, this could be measured with a 5mhz scope (anilog or digital) and elimites stuff,

Well I tried probing D4-D6 with cartridge and jumper pack installed.. and I did see some activity... but when I reset its low again... so it's possible that the act of probing is disruptive.

Well I tried probing D4-D6 with cartridge and jumper pack installed.. and I did see some activity... but when I reset its low again... so it's possible that the act of probing is disruptive.