Sinclair ZX81 Repair - White Screen and No Cursor

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As promised, here is the repair work I had to carry out on the ZX81 from the previous video.
Watch it here - • ZX81 Composite Video M...
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Опубликовано:

1 окт 2024

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Комментарии : 16

@MoreFunMakingIt 8 месяцев назад

Love that pin isolating trick. Definitely stealing that! 😂 Great video 😁

@HappyLittleDiodes 8 месяцев назад

Handy when trying to find which ram chip is shorting out a voltage supply

@jaycee1980 8 месяцев назад

Your "bad z80" might not be bad at all.. i noticed it's a modern one, and those are CMOS whereas the originals are NMOS. My guess would be the CMOS one is unhappy in this system as there are slight differences in levels and driving strengths

@HappyLittleDiodes 8 месяцев назад

Interesting! Thanks. I'll see if I can find it and test it, I can't remember if I put it in the IC graveyard

@mryon314159 8 месяцев назад

What doesn't fit in a ZX81 is a socketed ULA with a heatsink. Ask me how I know. D'oh!

@HappyLittleDiodes 8 месяцев назад

Oh no!

@richardblake8275 8 месяцев назад

Great vid. I’ve re-subscribed.

@moonandwanderer 8 месяцев назад

👌🏼

@yaktaur 8 месяцев назад

Great video :) Waiting for the next Jet Set Willy playthrough though.... ;)

@HappyLittleDiodes 8 месяцев назад

Next evening I have free from bench work!

@RudysRetroIntel 8 месяцев назад

Excellent video and work. For heat issues, I use my compressed air can and hold it upside down. Cold air comes out, and I spray IC in question. Works the same as you adding heat. Thanks for sharing another great video

@HappyLittleDiodes 8 месяцев назад

Thanks Rudy!

@TRONMAGNUM2099 8 месяцев назад

Great tip, I've always bent the leg out. Sometimes accidentally breaking legs off. You may want to get a Z80 tester kit. Fun little soldering project and they work great.

@HappyLittleDiodes 8 месяцев назад

I shall have a look!

@jonwheal 8 месяцев назад

I've recently come by a ZX81 from a friend of a relative who sadly died. I've been cleaning it up, but haven't dared switch it on yet! I have learned a lot from you, but have nowhere near your level of expertise, so I hope it just works.

@HappyLittleDiodes 8 месяцев назад

Are you able to check the polarity and output voltage of the PSU before plugging it in?