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Post by mastertech on Jul 12, 2015 14:36:12 GMT -5
Remove Q400 and retest SMPS and see if the 9v comes up. Fuse F450 NOT installed.
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Post by Decibel on Jul 12, 2015 15:04:50 GMT -5
Remove Q400 and retest SMPS and see if the 9v comes up. Fuse F450 NOT installed. Tomorrow I will try. Thank you for the patience. |
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Post by Decibel on Jul 13, 2015 7:15:45 GMT -5
Tried ... Q400 removed.
F450 not installed.
No change ... no 9v
I need a miracle.
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Post by mastertech on Jul 13, 2015 8:49:49 GMT -5
This is all part of narrowing it down. No need for a miracle, lol.
Did it remain the 2-3v?
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Post by Decibel on Jul 13, 2015 9:00:46 GMT -5
This is all part of narrowing it down. No need for a miracle, lol. Did it remain the 2-3v? Yes meter said 2.5/3.4v |
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Post by mastertech on Jul 13, 2015 11:29:22 GMT -5
Ok, a couple more tests just to narrow it down a little more and then we will put together a parts order.
Locate and remove R64 and R455. retest 9v and see if it came up. If it did not then continue.
Projector OFF and unplugged.
Lift 1 leg of these diodes and test them on diode scale both ways and give me those readings.
Z450, ____, _____
D450, ____, _____
D402, ____, _____
D401, ____, _____
D400, ____, _____
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Post by Decibel on Jul 13, 2015 11:44:58 GMT -5
I must to resolder Q400?
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Post by mastertech on Jul 13, 2015 11:50:41 GMT -5
No. Do not reinstall anything you remove unless I tell you to. Because if I did not tell you to put it back in then I am assuming it is still out. And that could mess me up. That fuse also stays out. |
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Post by Decibel on Jul 13, 2015 11:54:42 GMT -5
Ok I'm going to check.
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Post by Decibel on Jul 13, 2015 12:20:13 GMT -5
Desoldered R64 and R455
No change: no 9v
I'm going to lift pins of diodes and measure they.
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Post by Decibel on Jul 13, 2015 12:53:06 GMT -5
Z450 = 1 ; 882
D450 = 1 ; 391
D402 = 1 ; 728
D401 = 1 ; 571
D400 = 1 ; 1404
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Post by mastertech on Jul 13, 2015 15:04:00 GMT -5
Ok, 1 more test and I think we are done. Remove R450. Reinstall Z450, D450 and D402. Leave D400 and D401 disconnected. Recheck 9v and see if it comes up.
Remember, do not install any other components that I had you remove.
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Post by Decibel on Jul 13, 2015 15:47:41 GMT -5
Yessss finally 9.8v
But projector seems totally dead.
No diode led, nothing appear turn on.
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Post by mastertech on Jul 13, 2015 20:14:57 GMT -5
Yessss finally 9.8v But projector seems totally dead. No diode led, nothing appear turn on. Yeah, do not worry about the rest of the projector. I would be surprised if anything did work. Well we actually did 2 things at the same time so we have to see which one it was. So here is what I want you to do. Test R450 with your meter on ohm scale and see if it reads 332 ohms. Then put meter on diode scale and test led diode D451. Make sure there is no leakage 1 way. Even post the 2 diode readings here if you want. If diode and resistor both test ok then reinstall R450. Nothing else. Then retest the 9v and see if it remains or not. |
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Post by Decibel on Jul 14, 2015 0:38:44 GMT -5
Checked all
R450 show 338 ohms
Led diode D451 have 3 pins.
Two in upper side
One in bottom
Assuming pin 1 on left up, pin 2 on right up and 3 in bottom ...
Putting probes between 1 and 2 or between 1 and 3 there isn't active values. Meter show always "1".
I swapped probes in the tests above. Always "1".
Putting black probe in 3 and red in 2 meter raise until 1664
Putting red probe in 3 and black in 2 meter raise until 753
Then I resoldered R450
9.v is present and led diode D451 show a brilliant green not pulsating.
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