nashou
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Post by nashou on Feb 8, 2014 21:18:31 GMT -5
Yes I found it. The schematic showing the part was flipped( side A ) so I was looking on the opposite side ( right not left) for the part.
Pin 3 has no voltage the others are fine.
Nashou
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Post by mastertech on Feb 8, 2014 21:21:59 GMT -5
ic97  |
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nashou
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Post by nashou on Feb 8, 2014 21:23:38 GMT -5
Yep look at post above yours  |
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Post by mastertech on Feb 8, 2014 21:24:27 GMT -5
Yes I found it. The schematic showing the part was flipped( side A ) so I was looking on the opposite side ( right not left) for the part. Pin 3 has no voltage the others are fine. Nashou Good chance it is bad. Does it feel hot when powered? Hot would indicate the +3.3 is being drawn down. Try a diode test with it unplugged. |
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nashou
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Post by nashou on Feb 8, 2014 21:44:43 GMT -5
I did a diode test from ground(2) to all pins and between them and from ground to pin 3 i get .000 also I get continuity with a low resistance of 6 ohms where the other pins show over 200ohms .
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nashou
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Post by nashou on Feb 8, 2014 21:46:05 GMT -5
Oh And its hard to feel the heat the chip is only 2mm long and a 1mm wide at least. so I tried to use my laser thermometer. on ic 98 I got 22c on 97 it went up to 25c.
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Post by mastertech on Feb 8, 2014 21:55:36 GMT -5
I did a diode test from ground(2) to all pins and between them and from ground to pin 3 i get .000 also I get continuity with a low resistance of 6 ohms where the other pins show over 200ohms . At this point I would remove it and then diode test between the pads on the board for pins 2 and 3. Or you could also try just lifting pin 3 on the ic and retest. |
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nashou
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Post by nashou on Feb 8, 2014 21:58:54 GMT -5
Well i have the receiver in my kitchen so i'd have to take it down to my shop and clean off the bench. So what does that reg provide power for? and what is the 3.3m stand for? And I have to open the diner tomorrow at 5:30am so I might retire for the night and pick this up tomorrow evening. Thanks Mac |
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Post by mastertech on Feb 8, 2014 22:03:25 GMT -5
It powers the main processor. That's why it is dead. Lets hope it is just the regulator. I'm off till tomorrow also.
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nashou
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Post by nashou on Feb 8, 2014 22:30:27 GMT -5
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Post by mastertech on Feb 9, 2014 11:57:46 GMT -5
That is not a good cross. Do you want to know why or do you want me to just give you my cross?
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nashou
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Post by nashou on Feb 9, 2014 15:19:37 GMT -5
That is not a good cross. Do you want to know why or do you want me to just give you my cross? Is it because of the ripple current rejection is lower than the stock part, and maybe the addition of the parasitic diode? Amazon has the original but for 4.85. Ok so edumacate me why oh zen master. Athanasios |
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nashou
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Post by nashou on Feb 9, 2014 17:43:48 GMT -5
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Post by mastertech on Feb 9, 2014 18:26:50 GMT -5
Well when we first look at your link we see that there is no stock. So there is the first problem, lol. Then we see it is a 5v output and we need a 3.3v output. But maybe they have a 3.3v one. But then we see the pinout is completely different and will not mount correctly. Lastly we require an active high with auto discharge. Not seeing this even in this device. So my cross appears to be a twin sister to the original. And it is in stock at a really good price. I would order a bunch if I were you. www.mouser.com/ProductDetail/ON-Semiconductor/NCP4586DSQ33T1G/?qs=%2fha2pyFaduiq4pawerqXaTTn3mv94aqB4bvq7H4D%2fE8%3d |
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Post by mastertech on Feb 9, 2014 18:28:42 GMT -5
Ha, I did not refresh the page before I responded so I never saw this post. I see you found the correct cross. Very good.  |
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