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Post by Decibel on Jul 10, 2015 9:27:12 GMT -5
I check all fuses, no one is blown.
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Post by mastertech on Jul 10, 2015 9:32:36 GMT -5
I check all fuses, no one is blown. F450 is a fuse. If you read 14v on 1 side and 0v on the other, it is blown. Why would you think it is not blown? |
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Post by Decibel on Jul 10, 2015 9:36:35 GMT -5
I don't know that F450 is a fuse.
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Post by mastertech on Jul 10, 2015 9:39:23 GMT -5
What does it look like? Can you post a picture?
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Post by mastertech on Jul 10, 2015 9:41:47 GMT -5
Its part number shows a regular glass fuse, 2 amp/250v. Does it have a cover over it?
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Post by Decibel on Jul 10, 2015 10:02:16 GMT -5
Post 29 in picture posted by hulio I see a cap 0.22 uF 400v
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Post by mastertech on Jul 10, 2015 10:12:56 GMT -5
Ok, we were both in the wrong spot. Here is the fuse. Check it.  |
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Post by Decibel on Jul 10, 2015 10:14:12 GMT -5
Yes yes I checked many times this fuse. No blown
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Post by Decibel on Jul 10, 2015 10:17:11 GMT -5
Ok I must repeat past test in this fuse.
I'll check tomorrow.
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Post by mastertech on Jul 10, 2015 10:18:30 GMT -5
Then I need you to test on the pins with the projector running. Meter on DC voltage. Remember when I asked this? Neg probe on chassis, positive probe checks both sides.
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Post by Decibel on Jul 10, 2015 11:08:31 GMT -5
Ok!
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Post by Decibel on Jul 11, 2015 9:16:39 GMT -5
Can you measure the voltage on both sides of F450 on the sub board while the projector is on? Neg probe on chassis ground then check both sides with positive probe. Ok just did test. In both side of fuse the voltage is 2.7/2.8v Fuse not blown |
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Post by mastertech on Jul 11, 2015 9:52:54 GMT -5
Now remove the fuse and recheck both sides of holder.
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Post by Decibel on Jul 11, 2015 10:32:16 GMT -5
Now remove the fuse and recheck both sides of holder. First of all: the projector won't start. Meter shows a various voltage from 2.3v to 3.1/3.3v at one pin of removed fuse. At the other pin always "0.00v" |
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Post by mastertech on Jul 11, 2015 10:47:20 GMT -5
I figured it may not start. That is why you need that jumper on J30.
Well this tells us the supply is surely not making the 9v. What I found odd was that you said that D451 was bright green. But at this low a voltage is should be a dim green and not bright green until it had the full 9v.
But your meter tells us differently.
So where to start. Well we are back to those 2 caps first off. Do you continue poking around or do you replace them now before we go any further.
I would replace them even though you say it is a newer supply. There are to many if's involved to ignore them any further. So even if this is your friends supply, replace those 2 caps with new ones (C450,C451) and then we can continue if that does not fix it.
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