Can you please take a close up photo, under good light, of the underside area of the board where the 4116 DRAM chips are.
Mark
Spectrum+ 48k repair
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1024MAK
- Bugaboo
- Posts: 3123
- Joined: Wed Nov 15, 2017 2:52 pm
- Location: Sunny Somerset in the U.K. in Europe
Re: Spectrum+ 48k repair
Standby alert “There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
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Ast A. Moore
- Rick Dangerous
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- Joined: Mon Nov 13, 2017 3:16 pm
Re: Spectrum+ 48k repair
I’ve enhanced your picture and marked a few areas that I suspect might be solder bridges/shorts:
Perhaps Mark will be able to see more. I’d remove the lower-RAM board and inspect the traces on the logic board underneath it.
Perhaps Mark will be able to see more. I’d remove the lower-RAM board and inspect the traces on the logic board underneath it.
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Re: Spectrum+ 48k repair
I've cleaned the board multiple times with alcohol. Those bridges weren't there before. Maybe they have come from my workdesk? I have not cleaned it for a while. Some of those may look like bridges but they are just reflections of the soldering mask that has melted away due to my bad soldering skills.