Shoe167 Posted March 16, 2020 Share Posted March 16, 2020 (edited) https://imgur.com/a/kzcnd6N Bought this as is on ebay and it looks like someone replaced a chip and botched the install. I get continuity between pins 2+3 and 4+5.Also there was a capacitor that is lacking some solder on top but the bottom looks decent. Should that be fine or should I add a little more on the top. Console was described as turning on but no sound or video. Any tips on how to fix that bad solder job if its possible? Edited March 16, 2020 by Shoe167 Quote Link to comment Share on other sites More sharing options...
+Stephen Moss Posted March 17, 2020 Share Posted March 17, 2020 (edited) Pins 4 & 5 are GND so you should get continuity there but not between pins 2 & 3. You could try just reheating the solder joints, hopefully the solder will flow back onto the solder pads (assuming whoever repaired it did not remove them in the process). Otherwise use desolder wick to remove the solder so you can get a better lock at the damage and remove the short. As for the capacitor soldering, you can add more solder, if the through hole plating is in tact it should not matter and you can add solder from either side and it should flow through but if you want to be certain of a top connection then solder from the top in case the through plating was damaged. If have not heard of someone successfully resurrecting a Jag that has no sound or video. Maybe because both Tom and Jerry are blown when that occurs (speculation), unfortunately to my knowledge a Jaguar service manual that could help to potentially get it working has never been seen in public. But if you have access to a multi-meter check the input voltage on pin 8 and the output voltage on pin 1 of Reg1 (all other pins tied to GND) which supplies 5V for the audio system because if that is blown then you definitely will not get any audio. Edited March 17, 2020 by Stephen Moss Quote Link to comment Share on other sites More sharing options...
Shoe167 Posted March 28, 2020 Author Share Posted March 28, 2020 So I have made a little progress. After cleaning up the chip I was able to power the console on. I can see some video but it's very poor quality and no audio. It doesn't start the game just stays at the splash screen. https://imgur.com/a/Gb4CybF. I can hear a buzzing sound coming from the area around the u38 chip. I hit the capacitor near it with my soldering iron. Think that might be the cause? CPU gets pretty warm but not too hot to touch. Quote Link to comment Share on other sites More sharing options...
Shoe167 Posted March 28, 2020 Author Share Posted March 28, 2020 Also noticed the Motorola 68000 chip gets hot quick. Could this be because the chip is dead or could something else be causing it to get hot? Quote Link to comment Share on other sites More sharing options...
Shoe167 Posted March 29, 2020 Author Share Posted March 29, 2020 Touched up the soldering on u38 and its working! Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted March 29, 2020 Share Posted March 29, 2020 The buzz is normal and is actually coming from the coil near where u38 was. It can be vary between Jaguar units as to how audible it is. Quote Link to comment Share on other sites More sharing options...
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