Sinclair ZX80 / ZX81 / Z88 Forums

Turns out I simply had a bad (new) HD converter unit which is brilliant news! The R44 mod didn't make a difference so I ordered a second HD converter.

Sounds like the function switching inputs on your HDMI box are detecting what they consider to be a marginal voltage level. Hence the erratic symptoms. Weird how it worked fine a few weeks ago when I first hooked it up. Looks like the parallel R44 resistor mod is in order then? https://www.retrocom...

Now the unit is producing video which is yellow-ish and keeps switching on and off, cutting in and out. Perhaps I need to perform the RGB SCART blanking signal mod? It appears I am using the proper RGB-to-SCART cable as I have the +2A or +2B model. The most strange portion of this mystery is everyth...

After opening the computer up and doing a little research it appears I have a BLACK +2B model due to the motherboard reading: Z70833, 1988 Issue 2.
Source may be dubious since boot screen indicates +2A.

EDIT: This cable is labelled for the +2A, +2B and +3 models, version 2.3. It was working fine on my +2 the first few times I used it. This was the cable I received with the unit. I'm new to the Spectrum so I know very little.

After receiving my first Sinclair Spectrum 128 +2, I was overjoyed to see it was operating normally. Unfortunately, a few weeks later it’s producing this blue-tinted output: 342798CE-E8B8-4FB1-A22D-0DB0697EBC70.jpeg I’d greatly appreciate any ideas you may have as to solving this issue. My system wa...