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Post by dummyload on Jul 6, 2015 2:32:03 GMT -5
Wel offcourse it can not be a short in the connector of the controller board. Sorry me mistake ,monday morning.
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Post by Decibel on Jul 6, 2015 2:46:02 GMT -5
Update: founded a bad smd resistor in R7631455 Power Factor Corrector board R60 CE H470K F 0W25 |
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Post by Decibel on Jul 6, 2015 3:00:42 GMT -5
Obviously there isn't in my 808's donor board  |
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Post by Decibel on Jul 6, 2015 3:09:20 GMT -5
False alarm, the resistor R60 works. I had wrong the scale of the meter.
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Post by dummyload on Jul 6, 2015 3:09:24 GMT -5
What is bad about r60 ? It can not explain your symptoms , I60 however could.
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Post by dummyload on Jul 6, 2015 3:58:02 GMT -5
Look i'm out for now ,this is basic stuff it should not take more than an hour at most (in this case) to find what board is given havoc to the ++9v , if you should have followed and responded to me or the suggestions from others we would have found out days ago. I don't even want to think about guiding board level repair. Sorry .
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Post by Decibel on Jul 6, 2015 3:58:26 GMT -5
by the way pulling the hv board has nothing to do with finding the cullprit but is for safety (tubes and you, see removing vertical board) because you don't need hv anyway at this stage, Yes I understand this point. I tried to pull controller tray, no change, the projector start up always when I press main power button in back of the projector. It never goes in stand by mode. I tried to replace the smd cap C62 in the power factor corrector that seems broken. No change. |
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Post by Decibel on Jul 6, 2015 4:05:12 GMT -5
Look i'm out for now ,this is basic stuff it should not take more than an hour at most (in this case) to find what board is given havoc to the ++9v , if you should have followed and responded to me or the suggestions from others we would have found out days ago. I don't even want to think about guiding board level repair. Sorry . I tried all things based your suggestions. Where I do different things? Meantime, during these checks, I see various boards if there are bad components. Because somewhere there's surely one or more components that are bad. |
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Post by Decibel on Jul 6, 2015 4:18:04 GMT -5
I understand that the controller should not to be responsible of the issue because, as you and others friends said, somewhere else the ++9 standby voltage is dead.
To know that the controller could be fine is really a good new for me because the spare part is very rare and expensive.
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Post by dummyload on Jul 6, 2015 4:47:17 GMT -5
Wel now i have the answer i was looking for the main power always stays on even with pulled out tray (and with both smps?), Wel that means there is a problem on the pcf board ,the circuit around IC60 delays the on/off signal from the controller about a second and goes from there to the smps, IC60 also uses the++9v .
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Post by dummyload on Jul 6, 2015 5:37:37 GMT -5
Afther looking more closely it's normal that the circuit on te pcf put on the smps all the time ,because ++9v is only +3v Q60 can never conduct and cut off Q61.
So question is still what is degrading ++9v ,from what we know it can be I60 on the pcf board or a problem on the smps2 where ++9v is used ,(have you also a spare smps2 to test ?)
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Post by Decibel on Jul 6, 2015 5:47:12 GMT -5
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Post by Decibel on Jul 6, 2015 5:49:31 GMT -5
(have you also a spare smps2 to test ?) Yes I have. Always pull controller tray? |
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Post by dummyload on Jul 6, 2015 8:09:37 GMT -5
Not necessary , but i would leave tray and hv out for now.
To summarize all boards that use ++9v
smps subboard (generation ++9v)
smps2 board (used to feed some ad/da chips for voltage diagnotics)
pcf board (used for delay on/off smps and start pcf)
remote (backlight and ir data generation)
controller board (core voltage controller)
mother board (distribution ++9v)
Please anybody feel free to correct .
So only Ic60 of the pcf is left on my list for now ,but i doubt it because i think it should be burning because it should be dissipating a few watts if that is the culprit.
Also let projector only on for time needed for measuring.
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Post by mastertech on Jul 6, 2015 8:30:25 GMT -5
I won't intervene while you 2 are contemplating your next move cause it is never good to have more then 1 person guiding someone at a time. Only creates more confusion and mistakes. But I am curious what the "1" on your meter is. Was it .001 or 1.000 or what? What does your meter read on diode scale with the probes not touching and then when they are touching? |
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