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.

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.

Just measured this now.  When there is no cartridge there is no synch signals.  In fact there is no signal at all.  The image below is what you see when the cartridge and jumper pack are installed.

However I don't see a blank page on the screen, I actually get the message "no signal". So there is no signal at all.

I've a 100MHz digital one. I'm not able to trigger to anything useful on the output connector, but maybe I'm setting it wrong. I'm not used to video signals

I see, I will check again on my oscope but I think I dont have those. For reference, can you give me your scope settings for this wave?

BTW I'm still searching for a CRT screen

I'll get back to you on the scope settings... but I think your difficulty in triggering is probably because there is no signal... so you might hold off on the CRT unless you want one anyway... which I do.... anyway I was looking at your photos that you made available... and I think you might have a solder bridge between pin 105 and 106 of U10.  Zoom into your first picture and look at the bottom row and you will see what I mean.

Hmm, I'll check right away when I get home, but it's probably just a little dust. I've checked several times.
At this point, though, I'm really hoping it's a solder bridge... lol

BTW Thanks for all your help!

try reading this 

https://www.retrosix.wiki/composite-cvbs

i just wanted to confirm signal with no cartridge

try reading this 

https://www.retrosix.wiki/composite-cvbs

i just wanted to confirm signal with no cartridge