sasquatchuk Posted May 1, 2023 Share Posted May 1, 2023 (edited) First of all Hi to everyone, Im new here but run a YouTube channel repairing my old retro stuff amigas Atari 2600 just done the cleancomp mod love it. I now need your help, Hoping someone has some pointers for me here. I have a Atari Jaguar that fails to display on either RF or Composite video says no signal or no channel found. All the chips are warm voltages seem fine at u38. I've cleaned and reflowed the Cartridge slot and bios. Next I was thinking of removing the bios and replacing it what you think.. I have a scope but its not really up for testing the jaguar Anyone know of any other problems that could help. Cheers in advance Edited May 1, 2023 by sasquatchuk Quote Link to comment Share on other sites More sharing options...
else Posted May 1, 2023 Share Posted May 1, 2023 You didn't say if you have cartridge plugged in. The Jaguar won't turn on without one in. Quote Link to comment Share on other sites More sharing options...
else Posted May 2, 2023 Share Posted May 2, 2023 Also, because this topic comes up a lot, there is a pinned thread near the top of this forum:Everything you want to know about the Jaguar power supply and power issues Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 2, 2023 Author Share Posted May 2, 2023 Sorry I have a game plugged in and a genuine psu.. light is nice and bright.. Quote Link to comment Share on other sites More sharing options...
Stephen Moss Posted May 2, 2023 Share Posted May 2, 2023 7 hours ago, else said: You didn't say if you have cartridge plugged in. The Jaguar won't turn on without one in. I presume that was the case as the voltages a U38 were reported to be correct. If you are just getting a black screen with no boot audio or tumbling letters boot screen rather than the Red Screen of Death (RSOD) then unfortunately requests for help with this issues have come up before and to date as far as I know no solution has been found. The closest to a solution I have come to so far is that when using a SkunkBoard which fast boots the Jag bypassing that intro and a test program it that the video outputs parts of the test program ran fine but when I tried the audio section it just hung up on me, indicating that the issue may lie with the DSP but I do not have a lot of time to work on it so have not progressed any further than that. That does not necessarily mean that your Jaguar and the others have the same issue but as they appear to be presenting the same, then it is possible the same fault in common to all of them. Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 2, 2023 Author Share Posted May 2, 2023 Thanks for the info. Will lift the bios chip and replace it.. and check the traces under it.. I will keep working on it can't let it beat me. Shame they so rare to get hold of for parts.. do you by anyway know whee to get the joystick ports from.. I Seen.blur but not black.. Quote Link to comment Share on other sites More sharing options...
Stephen Moss Posted May 3, 2023 Share Posted May 3, 2023 19 hours ago, sasquatchuk said: do you by anyway know whee to get the joystick ports from.. I Seen.blur but not black. I am surprised you are having difficulty finding them in black as in my experience that is the "standard" colour, as long as you are searching for 15 way high density D female (a.k.a. socket/receptical) I would think you should be able to find some. Makes sure it is right angle (90 degree) and through hole. There is no indication as to whether the colour matches that of the image but this might do you, if you can only find them with the screw lugs as shown they are easily removed but what I am not sure about with this on is if the pin spacing is correct but they are usually fairly standard. 1 Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 3, 2023 Author Share Posted May 3, 2023 (edited) OK so update. I reflowed some more parts cleaned.. ext.. I can now sort of see it running on rf. Still no signal on the composite lead I bought of ebay. Will solder a lead directly I can solder of the rf as there should be a composite signal there to test. 20230503_173817.mp4 Edited May 3, 2023 by sasquatchuk Quote Link to comment Share on other sites More sharing options...
+af0l Posted May 3, 2023 Share Posted May 3, 2023 Just a guess - what color is the power LED? Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 3, 2023 Author Share Posted May 3, 2023 Green.. I have tried tuning it different countries made no difference.. I solderd the composite video lead to the board and no output on av.. but the machine is deffo running.. I will change the cap that the composite video signal runs through to the rf modulator.. Quote Link to comment Share on other sites More sharing options...
+Mitch Posted May 4, 2023 Share Posted May 4, 2023 Green LED means it is a PAL format Jaguar. If you are in North America that would be a problem. Mitch 1 1 Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 9, 2023 Author Share Posted May 9, 2023 Managed to get it a bit clearer on rf. Still nothing on composite.. do you think the video encoder is caput.. I've reflowed the legs anyone here have a spare encoder or know where I can get one.. cheers.. 20230509_210814.mp4 Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted May 9, 2023 Share Posted May 9, 2023 If the encoder was dead, you wouldn't have a picture on RF either. It sounds more likely that your composite cable is bad, or your TV doesn't like the signal for some reason and blanks the screen. 1 Quote Link to comment Share on other sites More sharing options...
sasquatchuk Posted May 10, 2023 Author Share Posted May 10, 2023 I've tried a few tvs.. even tried soldering a cable direct to the filters I was thinking the composite signal is to weak hence why the picture is poor on rf as it is fed from the composite and on composite it says no signal. I have changed the caps on the composite video circuit still the same.. its really annoying as I know the jaguar is loading games ect. Quote Link to comment Share on other sites More sharing options...
Beeblebrox Posted November 11, 2023 Share Posted November 11, 2023 (edited) @sasquatchuk how ya doing? I've got the same problem with video. I can hear games playing thought audio and have an extremely poor rf signal, barely visible. No av image. See my post here: I planned to recap and have a replacement bios chip from retrosix, but I am not convinced these are responsible. Did you get to the bottom of it for you own Jaguar? Edited November 11, 2023 by Beeblebrox Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.