1084s just died!

dopefiend · 15 October 2023, 15:29

I was pottering away getting some software transferred over to my CF card using WinUAE with my Amiga 1200 running in the background on my 1084s when suddenly there was a pop and the 1084s power light went out, the screen went black, and the monitor started letting out a high pitched whine.

The whine continues for a long as the monitor is on, and the display stays black. If I turn it off, the whine's pitch decreases until it stops.

Everything was working beautifully up to this point! Any ideas?

lesta_smsc · 15 October 2023, 15:39

Probably the LOPT? My Trinitron died just as unexpectedly but I was away for 5 mins in the time when this happened. No idea what happened or if there was a sound. Until then the TV was faultless and picture was very sharp, amazing contrast and even geometry was perfect!

ptyerman · 15 October 2023, 17:35

yeah, sounds like the LOPT. If so it's probably taken out the Line Output transistor with it but it's always a good idea to change that regardless.

dopefiend · 16 October 2023, 11:44

Forgive me for being clueless, is the Line Output Transistor the Horizontal Output Transistor?

Jope · 16 October 2023, 12:01

Yeps.

alexh · 16 October 2023, 12:24

Quote:

Originally Posted by dopefiend

Line Output Transistor?

LOPT = Line Output Transformer

https://en.wikipedia.org/wiki/Flyback_transformer

dopefiend · 25 May 2024, 10:23

Finally got around to working on this. I replaced the LOPT/Flyback, didn't get around to the Line Output Transistor/ HOPT, but it seems like the flyback was at least part of the problem as I have a beautiful picture now.

I have some weird issues, using Testbild.prg on my c64 to focus etc and I now see a little overlap of horizontal lines on the left hand side, only in this one test pattern, see here

https://imgur.com/a/5BEB8LP

Also when adjusting the horizontal width and centering, sometimes the picture disappears but if I wiggle the H width knob it comes back. Seems like dry or cracked solder right? On the connections to the actual pots? Anything else that could cause this?

skyzoo73 · 25 May 2024, 10:56

cracked solder right

this.

dopefiend · 25 May 2024, 11:45

Ok so I desoldered and resoldered all those pots at the back. But now it won't turn on at all! No power light, nothing!

dopefiend · 25 May 2024, 12:08

I figured it out! There was also some damage to the power cord. Found the break and just shortened the cord and we're good!

malko · 25 May 2024, 18:36

Quote:

Originally Posted by dopefiend

[...]
https://imgur.com/a/5BEB8LP
[...]

Looks like imgur.com is suffeting AI bots as well

and

Quote:

{"data":{"error":"Imgur is temporarily over capacity. Please try again later."},"success":false,"status":403}

zipper · 25 May 2024, 19:46

Not here - had to shrink the original..

malko · 26 May 2024, 00:11

Thanks

15 October 2023, 15:29	#1
dopefiend Registered User Join Date: Apr 2022 Location: London Posts: 5	1084s just died! I was pottering away getting some software transferred over to my CF card using WinUAE with my Amiga 1200 running in the background on my 1084s when suddenly there was a pop and the 1084s power light went out, the screen went black, and the monitor started letting out a high pitched whine. The whine continues for a long as the monitor is on, and the display stays black. If I turn it off, the whine's pitch decreases until it stops. Everything was working beautifully up to this point! Any ideas? Last edited by dopefiend; 15 October 2023 at 17:13.

25 May 2024, 10:23	#7
dopefiend Registered User Join Date: Apr 2022 Location: London Posts: 5	Finally got around to working on this. I replaced the LOPT/Flyback, didn't get around to the Line Output Transistor/ HOPT, but it seems like the flyback was at least part of the problem as I have a beautiful picture now. I have some weird issues, using Testbild.prg on my c64 to focus etc and I now see a little overlap of horizontal lines on the left hand side, only in this one test pattern, see here https://imgur.com/a/5BEB8LP Also when adjusting the horizontal width and centering, sometimes the picture disappears but if I wiggle the H width knob it comes back. Seems like dry or cracked solder right? On the connections to the actual pots? Anything else that could cause this? Last edited by dopefiend; 25 May 2024 at 10:38.

25 May 2024, 19:46	#12
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,841	Not here - had to shrink the original.. Attached Thumbnails

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15 October 2023, 15:39	#2
lesta_smsc Registered User Join Date: Feb 2012 Location: United Kingdom Posts: 3,184	Probably the LOPT? My Trinitron died just as unexpectedly but I was away for 5 mins in the time when this happened. No idea what happened or if there was a sound. Until then the TV was faultless and picture was very sharp, amazing contrast and even geometry was perfect!

15 October 2023, 17:35	#3
ptyerman Registered User Join Date: Jun 2012 Location: Worksop/UK Age: 59 Posts: 1,328	yeah, sounds like the LOPT. If so it's probably taken out the Line Output transistor with it but it's always a good idea to change that regardless.

16 October 2023, 11:44	#4
dopefiend Registered User Join Date: Apr 2022 Location: London Posts: 5	Forgive me for being clueless, is the Line Output Transistor the Horizontal Output Transistor?

16 October 2023, 12:01	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,904	Yeps.

25 May 2024, 10:56	#8
skyzoo73 Registered User Join Date: Sep 2019 Location: Italy Age: 51 Posts: 302	cracked solder right this.

25 May 2024, 11:45	#9
dopefiend Registered User Join Date: Apr 2022 Location: London Posts: 5	Ok so I desoldered and resoldered all those pots at the back. But now it won't turn on at all! No power light, nothing!

25 May 2024, 12:08	#10
dopefiend Registered User Join Date: Apr 2022 Location: London Posts: 5	I figured it out! There was also some damage to the power cord. Found the break and just shortened the cord and we're good!

26 May 2024, 00:11	#13
malko Ex nihilo nihil Join Date: Oct 2017 Location: CH Posts: 4,997	Thanks

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