Junkyard is a great game! Don’t see them to often . Nice job finding that diode , it’s amazing what one stupid little component can do ! I’ve had one of the reset daughter birds in my twilight zone for a year now and cross my fingers it’s been good !
Well, when it gets bad enough not to boot, it will probably bad enough to more easily diagnose the weak 5V. The WPC's had a moderately weak 5V from the git go.
I had the same fault on a dataeast Batman last week. That faulty diode is part of the bridge rectifier which is supplying a 12 volt regulator. With one diode in the bridge open circuit the DC produced on the large Capacitor is low. Testing on my Batman game showed 0.5 volts AC ripple on the smoothing capacitor and about 8 volts Dc instead of 13 V ..unregulated 12 volt. New bridge rectifier produced 13 volts and 0.1 volts Ac ripple.Only difference was Batman had a 4 pin rectifier instead of your 4 seperate diodes. There was no symptoms at all with Batman. Testing for AC ripple on DC lines is important. Diodes as you know usually go short not oc. That would have blown a fuse . Much easier to fix. Good videos there.
Stupid question: when you reflow solder joints, does that mean adding new solder to them or just melting the old solder and then letting it re-harden? Just did my first successful board fix on WhiteWater but want to make sure I'm doing it correctly. Always afraid I'm gonna burn a trace or a mounting point.
You add a bit of fresh solder too. If you want to do it really well, it is actually best to remove all the all solder first and then add new solder, but this takes much more time, so may people skip the removal unless the old solder has already been reflowed, or if the old solder is really bad/corroded.
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Junkyard is a great game! Don’t see them to often . Nice job finding that diode , it’s amazing what one stupid little component can do ! I’ve had one of the reset daughter birds in my twilight zone for a year now and cross my fingers it’s been good !
Well, when it gets bad enough not to boot, it will probably bad enough to more easily diagnose the weak 5V. The WPC's had a moderately weak 5V from the git go.
I had the same fault on a dataeast Batman last week. That faulty diode is part of the bridge rectifier which is supplying a 12 volt regulator. With one diode in the bridge open circuit the DC produced on the large Capacitor is low. Testing on my Batman game showed 0.5 volts AC ripple on the smoothing capacitor and about 8 volts Dc instead of 13 V ..unregulated 12 volt. New bridge rectifier produced 13 volts and 0.1 volts Ac ripple.Only difference was Batman had a 4 pin rectifier instead of your 4 seperate diodes. There was no symptoms at all with Batman. Testing for AC ripple on DC lines is important. Diodes as you know usually go short not oc. That would have blown a fuse . Much easier to fix. Good videos there.
Thanks for watching!
Stupid question: when you reflow solder joints, does that mean adding new solder to them or just melting the old solder and then letting it re-harden? Just did my first successful board fix on WhiteWater but want to make sure I'm doing it correctly. Always afraid I'm gonna burn a trace or a mounting point.
You add a bit of fresh solder too. If you want to do it really well, it is actually best to remove all the all solder first and then add new solder, but this takes much more time, so may people skip the removal unless the old solder has already been reflowed, or if the old solder is really bad/corroded.