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Post by mastertech on Dec 19, 2013 13:38:05 GMT -5
Ok, do the diode test on the board traces where you got the .054 reading and see if it is still low or if it came up.
Gotta go for an hour. I'll be back.
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Post by crudeau on Dec 19, 2013 13:48:35 GMT -5
Same readings excep for my first results. With negate on single left pin side I get 1.879 on top right and 1.902 on bottom right. Doubled drone before. But all other results are the same
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Post by mastertech on Dec 19, 2013 15:21:51 GMT -5
Well we are not looking good here. You see that ic on the board with 100 pins on it, marked ic105? Are there pin numbers on the board at each end of a row?
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Post by crudeau on Dec 19, 2013 15:43:15 GMT -5
I see but there's no numbers. Just dots every five I can see a pin 1 dot next to the printed ic105
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Post by mastertech on Dec 19, 2013 15:49:55 GMT -5
Is the corner of the ic cut at an angle where you see that number 1? The other 3 corners are regular 90 degree ones?
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Post by crudeau on Dec 19, 2013 15:56:15 GMT -5
Doesn't look like it. The top surface of the chip has a indented on three corners but not on one
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Post by crudeau on Dec 19, 2013 16:01:05 GMT -5
You thinking the CPU is shot?
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Post by crudeau on Dec 19, 2013 16:04:23 GMT -5
When looking at the board mounted in the chassis. The non indented corner is the bottom right
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Post by mastertech on Dec 19, 2013 16:10:46 GMT -5
Possible, but I want to see how bad so we can see if we can bypass a part of it and see what functions. I need you to do a diode test on it, using that pin 22 for ground and then test pins 64 through 69. They are on 1 of the long side of that ic. If the 1 you found is pin 1 on that ic it should be on a long side and it would be pins 1 thru 30. The the following short side would be 31 thru 50. Then continuing to the next long side it starts with 51. I would then need you to count to 64, diode test that pin, then go to the next pin 65, test it and so on to pin 69. And then give me all the readings.
But, I need to be sure you are on the correct side of that ic so we get the correct readings. If I have to I can post a picture of that ic and show you which way. However, if you can find R210, which is right next to 1 of the short sides, that is connected to pin 40. So the last pin on that short side would be 50. Then start on that next long side with 51 and count up. Let me know.
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Post by mastertech on Dec 19, 2013 16:11:57 GMT -5
That is pin 22 in CY272 for gnd.
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Post by crudeau on Dec 19, 2013 16:16:00 GMT -5
I see r210 in the bottom. R205 is on the side I want? Correct. First pin on bottom is 51
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Post by mastertech on Dec 19, 2013 16:20:50 GMT -5
Yes
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Post by crudeau on Dec 19, 2013 16:21:53 GMT -5
If my side was correct. I pulled .052 on 64-69
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Post by mastertech on Dec 19, 2013 16:29:32 GMT -5
Switch your DMM to DC voltage, leave ground where it is, plug in receiver and test pin 62 on that ic. Try not to slip.
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Post by crudeau on Dec 19, 2013 16:46:10 GMT -5
4.26
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