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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 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 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 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 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 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 0:56:36 GMT -5
Ok. Follow these next directions carefully so we can get this narrowed down. This test will be with projector NOT running and UNPLUGGED. Remove SMPS. On the mother board where the SMPS plugs in locate J421. Set your multi meter to diode scale. Look at attached image and test between these 2 point and give me your meter reading. The meter said "1" Bingo?
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Post by Decibel on Jul 5, 2015 17:20:25 GMT -5
Just tried checks, the results below.
All tests without HV board as suggest by dummyload.
With My SMPS = 3.8/4.00 v With other SMPS = 3.4/3.8v
Then reinsert my SMPS and tried to pull Vertical board = 3.8/4.0v
Then I tried to pull also RGB input/driver boards (only SMPS and Power corrector present) = the Projector won't start.
Then reinsert Vertical/no RGB input/driver boards = 3.8/4.0v
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Post by Decibel on Jul 5, 2015 16:49:29 GMT -5
Ahhhh ok Yes that pin goes to SMPS, the other pin goes to C225 on controller.
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Post by Decibel on Jul 5, 2015 16:02:38 GMT -5
I did not understand very well. What is the SMPS pad?
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Post by Decibel on Jul 5, 2015 15:37:17 GMT -5
Oh, you want an explanation. Ok. Right now you only have 2.8v at SR4. Now this means 2 things. Either the SMPS is not producing the full 9v "OR" the SMPS is working properly and a partially shorted component somewhere on the 9v line is pulling the voltage down to the 2.8v that you are reading. So you now need to find out which it is. Ok the SR4 was removed. The test wire is ready.
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Post by Decibel on Jul 5, 2015 14:48:41 GMT -5
Not a problem for me remove the SR4. I'm very very grateful at anyone helping me, but I would like to understand what I'll could discover doing this thing. In short, if the module SMPS is working properly and provides ++ 9 at controller, what happens if remove the SR4?
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Post by Decibel on Jul 5, 2015 14:29:54 GMT -5
I do not understand why remove the SR4. Would not it be easier to try to test if the voltage ++9v exists from SMPS sub board? If the ++9v does not come from the SMPS sub board, will not even on the controller. Correct? The good new is that - perhaps - the issue is not in the controller.
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Post by Decibel on Jul 5, 2015 13:52:21 GMT -5
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Post by Decibel on Jul 5, 2015 13:41:19 GMT -5
I found two versions of sub board. In one of these the cap C604 there isn't. However it is in filament voltage regulator section.
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