Thread #12357532 | Image & Video Expansion | Click to Play
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Find yourself through repair.
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why is soldering a mystical skill that is far more difficult to do than it actually looks?
my practice attempts usually end up destroying the board / components or not working st , there is no way I'd attempt it on a treasured piece of hardware.
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A friend of mine's megadrive 2 sends audio but no video to the TV. I checked out the continuity of his SCART and all seems fine. I assume something is wrong in the console; any idea what I should look for? (I don't have the console right now)
>>12357772
You must be doing something wrong, soldering is easy on most retro consoles.
Show examples of your practices
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>>12357772
If you're destroying components you're most likely running way too hot. When I repair boards I use a heatgun that I can maintain a decent temp without melting anything. For wire repair and connector repair I do it with a soldering iron. Use flux to make it easier on yourself and don't use more solder than you need
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>>12357876
No it probably won't be leaky and they might look good as new even. I'm guessing it's a capacitor issue because there's audio, which means the chips are working. And a video signal is an amped and filtered kind of thing that relies on the electrolytic caps.
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I have a PAL Mega Drive from years ago that go wrong. I suspect 3rd party power supply that I had back then. If I remember correctly, things went south when I was playing with 50/60 region switch (popular mod).
What I know
-Launches into White Screen
-YM 2612 warm
-Z80 warm
-7805's checked and give correct output of ~5V
What have I discovered:
-when I short 2 pins on Z80 (A15 and CLK if I remember correctly) It will continue to Everdrive menu.
-Games hang up on Sega Logo. If I short those Z80 pins again it will continue but freeze shortly after
-I managed to launch 240p Test suite.
-Every graphical test works.
-Z80 test gives me erros on Z80's RAM
-PCM sound test works, YM2612 no sound.
I don't have an oscilloscope to test any further
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>>12357532
Last year maybe in december there was a thread I was the guy with a broken PsP analog, Finally I repaired I had to order 2 different analogs because the first one was really defective worse than the borken one, the second is working as a charm.
While I had to modify a Xbox I left it in the corner for now is just I don't have time with my job and studying since I do both, I would like to get one hour or 2 to solder the chip and test it properly, I got a LPC board to make it easier since it's a 1.6 xbox.
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>>12360208
It's a pain but it's possible. A desoldering gun and lots of flux helps speed the process along, but desoldering braid works too. Don't forget to clear the contacts of excess flux after removing the old socket and retin the contact pads gor a good connection once you put the new one on.
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>>12361474
Oh man, my instinct would be to run a heat gun back and forth over the pins and pull it out, rather than fuck around with freeing each individual pin by removing solder. I bet those things soak up a shit load of heat though, being giant hunks of metal and all.
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>>12362130
I assume you meant a hot air station as a heat gun would be applying way more heat than you would with a desoldering gun. That said, a desoldering gun is fine and doesn't require more than a second of contact per pin.
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>>12358260
small update since I was at home today. I managed to test with Gen Test V2.4 and some good news and bad news.
-PSG and DAC tested successfully. FM is busted, no sound
-68k and VRAM tested successfully.
-Z80 RAM had like over 1000 errors lmao
Conclusion from this test? I think YM2612, Z80 CPU and/or Z80 RAM is fucked and need replacement.
My question is: Is Z80 RAM test worth anything if Z80 CPU is fucked?
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