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Post by Casethecorvetteman on Mar 23, 2019 2:25:39 GMT -5
Here was a later one after adjustments:  |
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Post by Decibel on Mar 23, 2019 2:48:22 GMT -5
Well checked diagnostic board, no problem. I noticed some differences between mine controller and Stefano's (look red points). At mine there are two different capacitors and one that's absent in the Stefano's one.     |
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Post by robin36mac on Mar 23, 2019 2:51:53 GMT -5
The yellow square box is still a capacitor, but a different kind.
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Post by Decibel on Mar 23, 2019 3:07:22 GMT -5
This controller have also difficult with remote control 🙁
I can not able to use it.
Only fixed remote for power on only.
Could be a symptom of supply issue?
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Post by Casethecorvetteman on Mar 23, 2019 4:56:47 GMT -5
This controller have also difficult with remote control 🙁 I can not able to use it. Only fixed remote for power on only. Could be a symptom of supply issue? Is this the same one showing -8v for the -12v line? |
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Post by dummyload on Mar 23, 2019 5:08:58 GMT -5
I don't relay much on the voltage dianostic menu ,i found it very inaccurate sometimes.
The yellow caps on your board are placed by me ,those caps where bad and i replaced them with tantalium caps because i had no other
at that time.
On the back of your board you will see another one that i placed there , thats the extra cap on +5vp .
The +5vp feeds the core and the +3.3v feeds ic3 and that chip is generating the convergence signals and also decoding the remote signals.
So the +5vp is a very important one because the +3.3v is also made from this voltage and exactly there they didn't place a cap in early version boards. The +3.3v being to noisy (oscillations) was the problem in a few boards that past my hands and replacing cap at ic67 and adding that cap on +5vp was the solution.
Not to say that that this is the problem on stefanos board ,only way to no sure is looking with on oscilloscoop because a voltmeter
doesn't tell you anything in this case.
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Post by Decibel on Mar 23, 2019 5:32:24 GMT -5
Ok I will see at back of my controller board and I'll put a cap in stefano's board.
Then I'll write the result here.
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Post by Decibel on Mar 23, 2019 5:57:48 GMT -5
Ok Mean time I put a missed cap in C121 (1u 50v). I hope that's no error. Then I found two tantalium caps in back of my boards. I must to put both in stefano's board? Remember: I've only electrolytic caps at moment.   |
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Post by dummyload on Mar 23, 2019 8:08:06 GMT -5
The added c121 looks ok.
I forgot I added two caps there,the one most near the edge of the pcb (heatsink) is put on the input of i68 (+5vp regulator) the one most far from the edge of pcb (heatsink) is on the output side of i68 this one is not present on the pcb .
Electrolyt is no problem but they must fit under the pcb (check for room between back pcb and chasis)
You should first check the voltages (+5vA,-5vA,+12vA,-12vA,+5vb,+5vp,+3.3v,+2.5v,)
to see if they are correct . If the readings are correct on a voltmeter (thats already a good sign) ,then there still can be to much noise
on the suply lines ,this is where a scoop comes in.
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Post by Decibel on Mar 23, 2019 9:08:46 GMT -5
I tried to insert the caps as you suggest but the modify has no effect.
Both electrolytics fit in back of the board.
I have only measure voltage with economic multimeter but I need to know all test points.
However, unfortunately, I don't own an oscilloscope.
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Post by dummyload on Mar 23, 2019 12:24:26 GMT -5
Can you replace c223 or put a new cap over the old c223 , then we can exclude those power lines. You can measure on the output of the regulators or output caps. Picture shows the supply on the controller.  |
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Post by Decibel on Mar 24, 2019 3:49:41 GMT -5
I replaced c223 and C253 like my controller board. No fix.
I bought a stabilized power supply, tomorrow will be deliver.
So I can start measures that you asked.
Where's the point that I can put the power? What's the correct voltage?
Little notice: in stand by I listen a "hiss".
I had never listened due the ambient noise but in the silence he can be heard clearly.
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Post by robin36mac on Mar 24, 2019 3:52:55 GMT -5
I have the "hiss" sound too on my 909, the SMPS is doing it. My spare one don't. Some does, some don't ; but nothing to worry about.
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Post by Decibel on Mar 24, 2019 3:58:21 GMT -5
I have the "hiss" sound too on my 909, the SMPS is doing it. My spare one don't. Some does, some don't ; but nothing to worry about. During stand by? |
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Post by Decibel on Mar 24, 2019 4:00:25 GMT -5
I forgot to mention that nothing comes out of the tubes now.
I don't have the menu on the screen.
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