Thanks for this vid, I've had a +2 in my cupboard for a while with exactly this problem and following your steps I noticed the same lack of 12V, short etc... and simply replacing TR9 fixed it. Used a ZTX651 as 650s are harder to find.
quick question. Ive got a 128 2B and pretty sure the ULA (amstrad gate array ) is dead. Have you ever replaced one and if so is it worth the effort or do you think it's a dead duck??
What makes you think its the ULA? Isn't the ULA on the 2b a surface mounted chip - I cannot remember, it has been ages since I saw the 2b motherboard? If it is the ULA the big problem is sourcing a replacement ULA.
well the machine powers on, I've checked the processor, RAM chips, all the usual suspects and as I understand if the ULA is faulty then you'll get a black screen. dont fancy trying to replace it tbh, yeh it's surface mounted. Just checking if Im not missing something. Will prob rip out the chips and ditch the board. Some machines are worth fighting for but gotta feeling this one is beyond repair....
I have this exact problem black screen, tr9 is burning hot, I hope its just that, thanks for this video, there's not much on repairing the zx I've seen,
I ordered a new DC socket btw. Not arrived yet and not worth filming. The problem with the DC jack is that one of the pins on it had sheered off the connection to the PCB and wouldn't join back up properly.
Do components other than capacitors fail in the way that capacitors seem to, or did the transistor fail because of the loose power jack, do you think? By the way, I've just managed my first electronic repair - two bulged caps inside an LCD monitor - thanks to some reclaimed caps from old PC motherboards. A most satisfying feeling. :)
+MarkTheMorose Don't know how I missed this message! Yes, some components just die from age / usage, but with transistors, diodes and resistors it tends to be temperature which shortens their age. Power spikes can kill transistors though. Great job on your LCD monitor =D
GadgetUK164 I figured you were off somewhere, busy bringing some neglected retro system back to life, so I didn't mind. ;) I've got a couple of other items that need re-capping, so the monitor was a confidence-booster.
I`ve just ordered both the transistors after getting blank screen. Thanks for the video.
Thanks for this vid, I've had a +2 in my cupboard for a while with exactly this problem and following your steps I noticed the same lack of 12V, short etc... and simply replacing TR9 fixed it. Used a ZTX651 as 650s are harder to find.
No worries - glad it was of some use =D Pleased to hear you've saved your Spectrum =D
Is there any one that can help with ear held hi fix ?
I am not familiar with that issue - maybe the ULA needs swapping?
quick question. Ive got a 128 2B and pretty sure the ULA (amstrad gate array ) is dead. Have you ever replaced one and if so is it worth the effort or do you think it's a dead duck??
What makes you think its the ULA? Isn't the ULA on the 2b a surface mounted chip - I cannot remember, it has been ages since I saw the 2b motherboard? If it is the ULA the big problem is sourcing a replacement ULA.
well the machine powers on, I've checked the processor, RAM chips, all the usual suspects and as I understand if the ULA is faulty then you'll get a black screen. dont fancy trying to replace it tbh, yeh it's surface mounted. Just checking if Im not missing something. Will prob rip out the chips and ditch the board. Some machines are worth fighting for but gotta feeling this one is beyond repair....
I have this exact problem black screen, tr9 is burning hot, I hope its just that, thanks for this video, there's not much on repairing the zx I've seen,
I ordered a new DC socket btw. Not arrived yet and not worth filming. The problem with the DC jack is that one of the pins on it had sheered off the connection to the PCB and wouldn't join back up properly.
Do components other than capacitors fail in the way that capacitors seem to, or did the transistor fail because of the loose power jack, do you think? By the way, I've just managed my first electronic repair - two bulged caps inside an LCD monitor - thanks to some reclaimed caps from old PC motherboards. A most satisfying feeling. :)
+MarkTheMorose Don't know how I missed this message! Yes, some components just die from age / usage, but with transistors, diodes and resistors it tends to be temperature which shortens their age. Power spikes can kill transistors though. Great job on your LCD monitor =D
GadgetUK164
I figured you were off somewhere, busy bringing some neglected retro system back to life, so I didn't mind. ;)
I've got a couple of other items that need re-capping, so the monitor was a confidence-booster.