guptau
Junior Member
Posts: 90 
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Post by guptau on Nov 7, 2015 23:50:19 GMT -5
I may have misunderstood it. I tested on the same side between 9 and 17, 10 and 14. Let me retest.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 0:02:38 GMT -5
9 to 17 or 14 to 10 is cross line continuity. They do not have continuity. May be I am still not clear about what you wanted tested.
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Post by mastertech on Nov 8, 2015 0:39:41 GMT -5
I am tryig to figure out why, when you were testing voltage on the KEY 0 line and you hit the power button the voltage did not drop. But when you do the ohm test on the front board between the key 0 line and ground the ohms drop to zero, or at least that is what I think you were telling me. This does not make sense.
Maybe try doing the ohm test on the CPU board connector. pins 17 and 10, press power button and see if ohms drops to zero or full continuity.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 10:03:02 GMT -5
I performed continuity test on pins 10 and 17 and my DMM kept on beeping as long as the button was pushed. I thought this test was better than resistance test.
On another note, from the begining, I had assumed that one of the components may have gone bad since the receiver stopped working so suddenly. I expected either capacitor or diode may be the culprit. I also thought that the problem may be confined to the PS board. Now I realize how much more I need to learn. Thank you much for all your teaching and help!
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Post by mastertech on Nov 8, 2015 11:04:17 GMT -5
Your welcome. Yes the continuity test is fine. I assume you are testing on the CPU board which is good. So you show continuity on pins 10 and 17 when you push the power button.
So now do the voltage test again on pins 10 and 17. Plug it in and see if your voltage now drops when you push the power button. You may have a loose connection somewhere and moving the boards connected it.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 11:21:19 GMT -5
Without pushing the button, the ohm reading is 0L. When pushed, ohm drops to 0.0 for a couple seconds then it starts coming up like 3.0 k. I suspect it could be because my probe may be moving a little. What do you think?
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Post by mastertech on Nov 8, 2015 12:20:21 GMT -5
So now do the voltage test again on pins 10 and 17. Plug it in and see if your voltage now drops when you push the power button. You may have a loose connection somewhere and moving the boards connected it. Did you miss this? |
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Post by mastertech on Nov 8, 2015 12:21:11 GMT -5
DMM on DC voltage.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 12:28:41 GMT -5
Some more good news. Now pushing button, both fans start whirring. Check SP Wire flashes and goes away. Sometime volume flashes and goes away in a couple seconds. Fans stop.
I again checked voltage between 10 and 17 to be 3.295 and it goes to 0 when button is pushed and comes back to 3.295 when button is let go just like you described. I also am pretty sure that something is loose in face plate area. |
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Post by mastertech on Nov 8, 2015 12:37:46 GMT -5
I also am pretty sure that something is loose in face plate area. Agreed. Hunt around and see what you can find. |
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 12:38:58 GMT -5
Sorry, I missed your posts when I posted the last one. I still do not see the stand by light. The receiver starts and stops in a couple seconds when button is pushed.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 13:06:33 GMT -5
There are 4 separate boards behind the faceplate. On right is push button part. I tried pushing directly but it starts and stops. The standby led is on the same board but it never lights up. I suspect that any signal is not coming in through the harness, it is only going out when button is pushed. I do not hear any clanking noise which will indicate loose part. Could it be a bad component in one of the 4 boards? Which board will be the most probable? Thanks.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 13:33:24 GMT -5
Pins on harness are LEDPURE (0V), KEY0 (3.295v). +5V_mpu (0v), gnd, Key1 (3.295v). 
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Post by mastertech on Nov 8, 2015 13:40:33 GMT -5
You can check to see if the standby light power is at the connector on the CPU you have been testing at, P7501A
DMM on DC voltage, receiver plugged in but not turned on. Neg probe on pin 10 and pos probe on pin 8. Should be app. 3.3v
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 13:51:38 GMT -5
It is 0V (-18mV). But, I just remembered. I cannot turn the receiver on. But power should be going to the PS board, right? Should I measure after turning on power?
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