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Post by mastertech on Nov 23, 2016 13:20:19 GMT -5
Set your DMM to diode scale and test on the points I have circled in the attached pic. Reverse the leeds to test both ways and give me the 2 readings.  |
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ady
Junior Member
Posts: 45 
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Post by ady on Nov 23, 2016 14:34:19 GMT -5
pozitive (red) of DMM to left point (ground) 447
red on the right point (output) 185
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Post by mastertech on Nov 23, 2016 15:45:09 GMT -5
Are the 2 points circled in red directly connected? Does your DMM show direct short between the 2?  |
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 0:46:57 GMT -5
yes, they are directly connected and DMM show direct short.
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Post by mastertech on Nov 24, 2016 11:41:13 GMT -5
In the area of ic959 locate D952 and D953 and test them both for any leakage. If they are ok then leave your DMM on diode scale and test across CC984 and give me the reading.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 12:06:57 GMT -5
in the picture D952 Aand D953 are the greens one.
D953 is under the ground and D952 to the right.
whe i put the DMM on the both ends, the dmm beeps and show 001. both of them.
the same when i change
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Post by mastertech on Nov 24, 2016 12:43:37 GMT -5
DMM is on diode scale?  |
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 12:52:52 GMT -5
yes.
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Post by mastertech on Nov 24, 2016 13:01:20 GMT -5
Ok. A little more research indicates those are not diodes. They are safety resistors. So your test readings are good. Did you test across CC984 like I asked?
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 13:03:34 GMT -5
182 and reverse 443
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Post by mastertech on Nov 24, 2016 13:45:47 GMT -5
At this point I cannot rule out that ic959 might be bad even though it worked when you applied the +5v to it when it was removed. To continue testing we would now have to put it back in. But if it is ic959 breaking down when under load we would not know for sure and we could be looking for a different problem when there is none. I would much prefer putting in a new ic959 and then continue if problem still there.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 14:00:36 GMT -5
it's a good ideea, but i didn't find on the shop the ic959. i will search an equivalent.
i will tell you what i will find.
thx
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Post by mastertech on Nov 24, 2016 14:01:32 GMT -5
If you want to try and keep going you can locate IC802 on this same board and test it for proper voltage output (3.3v) and if it is good you can swap it with ic959 and see what happens.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 14:04:06 GMT -5
LD1117V33 this one it's good?
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ady
Junior Member
Posts: 45
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Post by ady on Nov 24, 2016 14:04:50 GMT -5
i will try first to swap
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