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July 23, 2019, 10:23:42 AM
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| | |-+  Blank Screen; what's broken?! [Famicom RF]
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Author Topic: Blank Screen; what's broken?! [Famicom RF]  (Read 1054 times)
80sFREAK
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« Reply #15 on: February 21, 2019, 01:57:34 PM »

Bottom right corner of RP2A03 on your photos, there is "that green part".
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urufuNoFamicom
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« Reply #16 on: February 25, 2019, 02:17:23 AM »

Would this↗︎ work? Thinking about getting this and the SRAM chip↗︎ (might as well replace it), but my electronics knowledge is hit or miss.
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80sFREAK
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« Reply #17 on: February 25, 2019, 04:31:54 AM »

Yes, variable ceramic capacitor should work.
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urufuNoFamicom
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« Reply #18 on: February 25, 2019, 08:29:26 AM »

Wait, so does it have to be a "variable" capacitor by name? Digikey has separate selections for those. And if I'm not mistaken in reading the datasheet for the linked capacitor, it can only go on 10%, which 1.1*22 (or 22 + 10%) is 24.2pF. Is the max being 27pF a requirement?

I found a replacement trimmer but it was like $4 Lips Sealed

Sorry if i sound like I don't know what I'm doing. My knowledge is usually project oriented, so it wildly varies based on what I'm dealing with. Just need to make sure I order the right part.
« Last Edit: February 25, 2019, 08:39:27 AM by urufuNoFamicom » Logged
80sFREAK
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« Reply #19 on: February 25, 2019, 09:27:28 AM »

Do you have any scrap electronics around? Those cheap chinese made radio or tv or whatever with thru-hole components? Get just ceramic capacitor 22pF or 27pF and replace trimmer. K.I.S.S.
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urufuNoFamicom
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« Reply #20 on: February 25, 2019, 11:46:05 AM »

No, but you [inadvertently] answered my question anyways; the 22pF ceramic will do. I'll post whether the capacitor was the issue, as well as the SRAM if the capacitor swap fails to fix it.
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80sFREAK
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« Reply #21 on: February 25, 2019, 01:42:30 PM »

You also might need to desolder XTAL(grey thermoshrink with 21.477 on it) and clean under and its bottom, where is pins. My guess, there is just no CLK, so everything is dead
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urufuNoFamicom
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« Reply #22 on: February 25, 2019, 04:31:26 PM »

I'll try that when I replace the capacitor. Going to hold off on the SRAM until i know for sure whether it's an issue, but i bought one just in case. Parts should arrive Friday if they ship on time. Smiley
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