For peeling the front plate and similar tasks dealing with these adhesives, a heat gun or even a hair dryer is your best friend! Well if combined with some patience... Also metal tools (esp. a knife) are not ideal. There are cheap phone repair sets which deal with glued displays and batteries in a gentler way, but even guitar picks, old credit cards etc. can work well.
You might try caps at the outputs of the -5 and +12 supplies. Always better to get it at the source. 10 uF should be enough. Something I remember from my TS1000 is that the sync pulse goes far too low. I see it happening here too. It should only go a short way below the black level. The diode you bypassed is probably in series there for the voltage drop to cut that down some. I had to do that to my TS1000 with a resistor to ground after to keep the diode conducting. Amazing the tidbits I can remember when I didn't even know where my cell phone was earlier.
Trying to get a schematic of the TS1500 - links so far have been to archive.org ... there is also some discussion about doing similar mod as ZX81/Jupiter Ace ... www.sinclairzxworld.com/viewtopic.php?f=7&t=3771
![🇺🇦 УМПК-Р (UMPK-R): Part 3 (Video output troubleshooting continues) [TCE #0546]](/img/n.gif)
For peeling the front plate and similar tasks dealing with these adhesives, a heat gun or even a hair dryer is your best friend! Well if combined with some patience...
Also metal tools (esp. a knife) are not ideal. There are cheap phone repair sets which deal with glued displays and batteries in a gentler way, but even guitar picks, old credit cards etc. can work well.
Ahhh, of course. First time removing the fascia ... I thought it might be a bit easier but it was really stuck on there!
You might try caps at the outputs of the -5 and +12 supplies. Always better to get it at the source. 10 uF should be enough.
Something I remember from my TS1000 is that the sync pulse goes far too low. I see it happening here too. It should only go a short way below the black level. The diode you bypassed is probably in series there for the voltage drop to cut that down some. I had to do that to my TS1000 with a resistor to ground after to keep the diode conducting.
Amazing the tidbits I can remember when I didn't even know where my cell phone was earlier.
Trying to get a schematic of the TS1500 - links so far have been to archive.org ... there is also some discussion about doing similar mod as ZX81/Jupiter Ace ...
www.sinclairzxworld.com/viewtopic.php?f=7&t=3771