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Post by mastertech on Sept 22, 2015 9:42:41 GMT -5
So you should have 4 wires on your board when you are ready to do the testing.
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Post by Decibel on Sept 26, 2015 11:09:34 GMT -5
The test with bend legs of transistors is very difficult for me. Can I do the test with resistors?
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Post by mastertech on Sept 26, 2015 21:01:49 GMT -5
The test with bend legs of transistors is very difficult for me. Can I do the test with resistors? I actually thought I was making it very simple. Bending a leg on a transistor has almost no difficulty level other then if something is in the way of the leg. And unfortunately the point to choose where to cross these channels is very limited. We cannot determine which location to look for the problem until the area is narrowed down. If this procedure is to difficult then perhaps someone else needs to work on the board.  |
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Post by Decibel on Sept 27, 2015 3:27:36 GMT -5
Tried.
Toasted R22 and R82 resistors
Smell of burning from these resistors, I turned off the projector.
The meter say that the resistors are good.
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Post by Deleted on Sept 27, 2015 8:48:33 GMT -5
Could you make pictures of the problems? Perhaps we see a solution.
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Post by Decibel on Sept 27, 2015 8:51:08 GMT -5
Could you make pictures of the problems? Perhaps we see a solution.   |
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Post by Deleted on Sept 27, 2015 8:54:47 GMT -5
I think you did not disconnect the resistors from the old way it was going?
I see R22 right at the bottom right of the second picture. Is it not easy to take that leg out and connect a wire? No wait that would not work.
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Post by Deleted on Sept 27, 2015 9:07:06 GMT -5
I was just double checking these schematics and it looks like you have to also cross another line in these circuits to do the test properly. This would be R4 and R64. Just lift 1 leg on each resistor (make sure it is the same leg) and use wire to cross the circuits. I will attach image shortly. You see mastertech writes about legs of resistors not transistors! But it seems r4 is a smd resistor on the back. |
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Post by mastertech on Sept 27, 2015 9:16:37 GMT -5
If the resistors are SMD then you just have to remove it and stand it up on one pad and solder it there and then solder the wire to the other end of the resistor.
But you have to make sure that both resistors are standing on the correct pad based on the schematic. If not, smoke can occur.
AGain, if you are not up to the task you may want to stop.
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Post by Decibel on Sept 27, 2015 9:35:44 GMT -5
So I must "crossing" transistors and resistors?
Both conditions?
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Post by Deleted on Sept 27, 2015 9:51:35 GMT -5
Where did you get the transitors? Perhaps I am wrong but I did not read about transistors.
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Post by Decibel on Sept 27, 2015 9:55:44 GMT -5
Q3 and Q63 as Mastertech said.
I desoldered these transistors, then bend legs 3 and "crossing" the connections between these transistors.
In this condition I don't touched the resistors.
Perhaps I must to "crossing" also the resistors?
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Post by Deleted on Sept 27, 2015 12:25:21 GMT -5
This is pretty advanced testing!
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Post by Deleted on Sept 27, 2015 12:25:47 GMT -5
Yes mastertech writes also!
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Post by mastertech on Sept 27, 2015 21:22:50 GMT -5
So I must "crossing" transistors and resistors? Both conditions? Yes. Both "MUST" be done to do the test. |
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