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Post by crudeau on Dec 17, 2013 14:11:05 GMT -5
2.42 also using pin 3 in that connector
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Post by crudeau on Dec 17, 2013 14:37:13 GMT -5
Just noticed that I left the unit plugged in for about ten minutes. I had forgotten to unplug it. Now that power switch was latched off. But 8u-110041-4 and 5 are two transistors up top and they were hot. The other two identicle ones where cold. And the little one between them was also cold. I'm sure these are the amplifiers for Mayberry the rear speakers or 2nd channel but seems odd only one side got hot. And there is nothing at all plugged into the unit
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Post by mastertech on Dec 17, 2013 15:15:41 GMT -5
Ok, now on the wire you cut from pin 8 of that connector, strip both ends back a little bit and get me the voltage readings from each of those 2 ends, 1 end going to that connector and the other end going to what ever board. Use chassis for ground on this.
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Post by mastertech on Dec 17, 2013 15:17:57 GMT -5
Just noticed that I left the unit plugged in for about ten minutes. I had forgotten to unplug it. Now that power switch was latched off. But 8u-110041-4 and 5 are two transistors up top and they were hot. The other two identicle ones where cold. And the little one between them was also cold. I'm sure these are the amplifiers for Mayberry the rear speakers or 2nd channel but seems odd only one side got hot. And there is nothing at all plugged into the unit I just saw this. Let me look into this while you do that other test. |
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Post by crudeau on Dec 17, 2013 15:54:02 GMT -5
I get .01 volt on the main board side and 1.12 volts on the other end that connects to the side board
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Post by mastertech on Dec 17, 2013 16:12:28 GMT -5
Ok, I need you to ground out the pin 7 wire. You can leave it connected and just strip back some insulation enough to attach a piece of wire. Then ground that wire to chassis somewhere. Make sure you have a good solid connection. Then plug it in and see if that red led is still blinking.
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Post by crudeau on Dec 17, 2013 16:22:11 GMT -5
Still blinking. And it's definetally grounded
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Post by mastertech on Dec 17, 2013 17:47:09 GMT -5
Looks like we are heading to the CPU board (110031-1). How hard is it to get at this board to do testing?
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Post by crudeau on Dec 17, 2013 18:15:15 GMT -5
Is that the board connected to the face plate? If so any tips to getting it apart? Or just go at it easy
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Post by mastertech on Dec 17, 2013 18:29:35 GMT -5
No, it's the one that CX115 connects to. Should be at the left rear when looking at the back of the unit. I see 2 white connectors at the top. Let me see if we can test there.
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Post by crudeau on Dec 17, 2013 18:40:01 GMT -5
Ok. I should be home I about 20 minutes or do. And I'm home alone so I can hopefully get it busted out and hopefully figured out. What are the tests you want me to do on the board
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Post by mastertech on Dec 17, 2013 18:57:26 GMT -5
Looks like you can test at CY272. That is one of those 2 flat ribbon cables at the top of that CPU board. If you look at that connector where the ribbon pushes in there should be small metal points you can test at. Let me know if it is not like that.
DMM on DC voltage, plugged in and neg probe on pin 22 and positive probe on pin 25. Let me know what you get.
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Post by crudeau on Dec 17, 2013 19:51:35 GMT -5
.75
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Post by mastertech on Dec 17, 2013 20:09:37 GMT -5
Ok just to verify, connector CY272 pin 25 pos probe and pin 22 neg probe, DMM on DC voltage, unit plugged in?
If yes, try chassis for gnd.
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Post by crudeau on Dec 17, 2013 20:15:02 GMT -5
Correct. .75. Using chassis ground I get 1.21
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