spectrum 128 no display on TV and RGB output ;
i have verified and swapped the ;
ula
rom
no change ,
12v is around 11,5v
no component is heavily heating up .
suspect tea2000 ?
any help appreciated
spectrum 128 no display
spectrum 128 no display
Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo-Velleman interface system-Currah microspeech -Ql - 512k exp.- Ql printer - Cst floppy interf.- Double 3.5 floppy- Minerva - Qimi-and much more .
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Re: spectrum 128 no display
A faulty TEA2000 should not affect the RGB output…
Is the Z80A getting a 3.5MHz clock on pin 6?
Mark
Is the Z80A getting a 3.5MHz clock on pin 6?
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
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.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
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.
Re: spectrum 128 no display
christmas eve overhere ,
i will see if i can get the test equipment next to the tree
tae2000 indeed receives the rgb from the ula , so no rgb in means no video out .
already swapped the ula , and no difference .
next search for the clock signals .
owner claimed it was working when he brought it to me ( with a tape-loader problem ) .
got one tape-loader problem solved in the typical way of re-soldering the socket to the pcb again .
now for the sudden death which has no video output and a tapeloader problem and a defective keyboard .
i will see if i can get the test equipment next to the tree
tae2000 indeed receives the rgb from the ula , so no rgb in means no video out .
already swapped the ula , and no difference .
next search for the clock signals .
owner claimed it was working when he brought it to me ( with a tape-loader problem ) .
got one tape-loader problem solved in the typical way of re-soldering the socket to the pcb again .
now for the sudden death which has no video output and a tapeloader problem and a defective keyboard .
Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo-Velleman interface system-Currah microspeech -Ql - 512k exp.- Ql printer - Cst floppy interf.- Double 3.5 floppy- Minerva - Qimi-and much more .