Re: Commodore 1084s Sound Issue
I changed this before....
kadird
Member
Last Activity: 02-05-2022, 04:14 PM
Joined: 02-26-2018
Location: istanbul
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Re: Commodore 1084s Sound Issue
I do. Something blown too in supply part and dont know which one was.
Monitor complete dead now, fuse is ok. And when i discharging sucktion cup of eht this time, very long arc jumped to the screwdiver. Normally it was only 3-5mm but this time it was minimum 5cm of arc occured between eht cap and the screwdriver connected to GND. What a mess 
Hope this is not EHT againg because it is very expensive to change again.
Last edited by kadird; 04-15-2020, 03:49 PM.Leave a comment:
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Re: Commodore 1084s Sound Issue
It is looking good.
[url]https://imgur.com/a/PY2Z2DI[/url]Re: Commodore 1084s Sound Issue<br /.../PY2Z2DI[/url]Leave a comment:
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Re: Commodore 1084s Sound Issue
Here is my manual, it is good to follow.
[url]https://1drv.ms/b/s!Al_2SS8NWtMWlYQCZuRoX3N4Qywiwg?e=wWwqgz[/url]
In this picture i marked 9v line goes opamps i think, because this is only 9v in supply side. Should i change caps numbered 2444 & 2447 seen here now?
[url]https://imgur.com/a/B54l3ED[/url]Re: Commodore 1084s Sound Issue<br /...cture i markedLast edited by kadird; 04-15-2020, 01:55 AM.Leave a comment:
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Re: Commodore 1084s Sound Issue
Thanks for the explantation.
Where should i check now for audio then? When i put new opamp to the circuit, some high humming, some ("hissing") noise like random fm band we can hear from radio in no broadband station, and randomly occuring impulse-like high pitched noises hear from headphones and speakers for a while, opamp's heatsink become hot and then everything stop working and then only very very low output remains can hear from the headphones or speakers, which is at the input source, like playstation 2 or anything has...Leave a comment:
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Commodore 1084s Sound Issue
Hi all,
I changed mine 1084s' EHT few months ago and then monitor started blown away the TDA7052 sound amplifier/opamp chips.
I tried these list until now:
- Simply cleaned volume knob's potentiometer and all other pots with contact cleaner,
- Replaced potentiometer from two constant resistors, becuase i dont have stereo (dual) potentiometer for opamp's signal level input,
- Changed faulty opamps with new ones, they are blown again,
- Checked V+ of opamps, there are 9V of this point, its normal value from service...Last edited by kadird; 04-14-2020, 11:18 AM. -
Re: Commodore 1084s-p1 fault with video.
thanks man, i'll do it again this way....Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
I just configure brightness potentiometer on the EHT and problem solved.Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
Hello again. I replaced EHT transformer with new one, picture partly came back but another issue appeared now. Here is the video about new situation:
[URL="https://youtu.be/GIYkvtMsf28"]https://youtu.be/GIYkvtMsf28[/URL]
Where should i check now? Caps maybe or?
Thanks.
Re: Commodore 1084s-p1 fault with video.
Hello again. I replaced EHT transformer with new one, picture partly came back but another issue appeared now. Here is the video about new situation:
Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
okay, which one is B+ cap then?...
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Re: Commodore 1084s-p1 fault with video.
thx again, can u give me part numbers in schematics? for example, which one is flyback transistor, 7512?
[url]https://imgur.com/a/KKkkpEw[/url]Re: Commodore 1084s-p1 fault with vi.../KKkkpEw[/url]Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
@stj, I cant spot these points in the pcb, is there any detailed schematics or guide somewhere?Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
Okay ill try it thanks...
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Re: Commodore 1084s-p1 fault with video.
Thanks for advices. I dont measure any voltages yet. Only visually controlled around pcb and dont noticed any bad looking caps or transistors. I have service manual, will check soon. Thanks again....Leave a comment:
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Re: Commodore 1084s-p1 fault with video.
Yes, it is Philips one. What's the line output transformer, you mean flyback transformer?...Leave a comment:
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Commodore 1084s-p1 fault with video.
Hi all, i have a 1084s and that was working fine until yesterday. But yesterday monitor is suddenly stopped and faulty now.
I want simply upload a video about problem, which parts and areas should i check, can anyone help?
Thanks.
[url]https://youtu.be/qiizl8iJRLM[/url]https://Hi all, i have a 1084s and t...<br /> <br /> -
Re: Original Xbox Replacement Caps
Hi all,
Great topic first of all. Just bought a NTSCU Xbox from flea market and all caps are removed from mobo. So, i need cap list with location info. For example:
1uf 10v at C690 at pcb tag/marking etc.
I think mobo is v1.6 due to the mfg date of 04-10-2004.
Can anyone help?Leave a comment:
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