guptau
Junior Member
Posts: 90 
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Post by guptau on Nov 8, 2015 14:03:21 GMT -5
It did not make a difference. Power connected, receiver not on, voltage between 10 and 8 pins is 0V.
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Post by mastertech on Nov 8, 2015 14:06:30 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? Yes, that was going to be my next suggestion. You should hear or feel the relay click on the power supply board when you press the on button and those fans start to spin. |
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 14:10:09 GMT -5
It does exactly what you saying about clicking and fan starting. But, the standby power is not coming in (#8pin) and the receiver starts and stops in second or 2.
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Post by mastertech on Nov 8, 2015 14:32:03 GMT -5
Well we have 2 possibilities now. Lack of power somewhere or going into protection. Are you able to test at the resistors around Q7022(MPU on CPU board)with it plugged in?
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 14:41:54 GMT -5
It is very difficult with everything plugged in. Which one need to be tested? How to test surface mount register?
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 14:48:40 GMT -5
This side looks doable. 
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Post by mastertech on Nov 8, 2015 14:57:23 GMT -5
Lets check something else first then. Go back to Q7013 on that cpu board. When you checked if before you had 5v on pin 1 and nothing on pins 3 and 5. Set your DMM on DC voltage. Secure your neg probe on DG gnd where you do not have to hold it. DG gnd is the same as pin 10 you have been using. Then while holding the pos probe on pin 3 of Q7013, press the power button and see if you get 3.3v until the unit shuts down again. If you do have it, do the test again but on pin 5 this time. See if you have 3.3v until it shuts down.
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Post by mastertech on Nov 8, 2015 15:00:58 GMT -5
I just noticed in your picture that the top board to the right is not pushed on all the way. It is up on the left side. Pull the board off and check for bent pins. If no bent pins put it back on but be sure it is on all the way. |
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 15:06:35 GMT -5
No bent pins. I pushed it all the way. The voltage at pin#8 is still 0. I missed the other post. Going to work on it.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 15:12:30 GMT -5
Lets check something else first then. Go back to Q7013 on that cpu board. When you checked if before you had 5v on pin 1 and nothing on pins 3 and 5. Set your DMM on DC voltage. Secure your neg probe on DG gnd where you do not have to hold it. DG gnd is the same as pin 10 you have been using. Then while holding the pos probe on pin 3 of Q7013, press the power button and see if you get 3.3v until the unit shuts down again. If you do have it, do the test again but on pin 5 this time. See if you have 3.3v until it shuts down. What is DG gnd? |
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 15:21:37 GMT -5
Can you show me where on broad? Would the chassis work?
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Post by mastertech on Nov 8, 2015 15:23:26 GMT -5
Lets check something else first then. Go back to Q7013 on that cpu board. When you checked if before you had 5v on pin 1 and nothing on pins 3 and 5. Set your DMM on DC voltage. Secure your neg probe on DG gnd where you do not have to hold it. DG gnd is the same as pin 10 you have been using. Then while holding the pos probe on pin 3 of Q7013, press the power button and see if you get 3.3v until the unit shuts down again. If you do have it, do the test again but on pin 5 this time. See if you have 3.3v until it shuts down. What is DG gnd? DG gnd is digital ground. It is not chassis gnd as you found out in the beginning. You have been using pin 10 which is DG gnd but if you cannot secure your neg probe to it, maybe using alligator clips or something then you can look at the schematic for DG gnd and see if there is somewhere else you can secure that neg probe at. I would rather you secure the neg probe because when trying to hold 2 probes and also push a button there is more of a chance of slipping and damaging something else. |
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 15:38:26 GMT -5
Yes, both are getting 3.31V once button is pushed. I was able to secure - probe on pin 10 using a third hand.
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Post by mastertech on Nov 8, 2015 15:57:43 GMT -5
These are the resistors on the back of that CPu board I want you to test if you can get at them.
R7124, R7125, R7139, R7140
Test on either side of resistors it does not matter.
See what voltage is when you push power button and then the voltage after it shuts down.
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guptau
Junior Member
Posts: 90
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Post by guptau on Nov 8, 2015 16:08:04 GMT -5
I can not get to other side unless I disconnect the HDMI board from the connector which was not all the way pushed. I think it should be ok. Testing with +ve probe on the register with -ve at pin10? Please let me know.
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