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Post by u2nmg93 on Nov 2, 2017 11:47:30 GMT -5
Ran through with the TV connected and on to each receiver and disconnected. One is the TX-NR555 that has no sound which I called "GOOD" and the other is the 545 that has sound but no video labeled "NOVID" I'll try and test Q8704 and Q8705 later today or tomorrow. Attachments:HDMI Pinout.xlsx (9.76 KB)
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Post by mastertech on Nov 2, 2017 21:11:48 GMT -5
Also test R8101 for 0 ohm.
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Post by u2nmg93 on Nov 8, 2017 11:48:35 GMT -5
R8101 reads 0 ohm, Q8704 reads 0v on leg to R8704 and 3.2v on the other 2 legs. Q8705 reads 3.2v on the leg connected to Q8704 and 0v on the other 2 legs. Q8704/5 are both located on the bottom side of the board so I had to solder a small piece of copper wire to each leg to test it. If any of the readings don't make since I'll test them again.
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Post by mastertech on Nov 9, 2017 17:56:11 GMT -5
Well I think there has been enough testing to make an assumption of what may be going on. Clearly the HP_DET line in not being activated on the HDMI out connector. From the various schematics I have looked over it appears as though the voltage for this line when activated comes from the adjoining HDMI input connector. But this is after the connection is acknowledged. And the end with the acknowledgement problem is the HDMI out device.
When I look at your voltages from when you tested your HDMI out socket I see a problem at pins 10 and 12. Now normally a slight variation in voltage would be fine but in this case I would say it indicates a problem. So your HDMI out port is not sending the proper signals to the opposing HDMI in device and it is in turn not sending the return HP_DET signal to turn on the video which I believe is partly for Q8704 and Q8705.
Everything I see points back to Q8000. I think if it were a problem in some other ic or component in the video chain you would probably see the HP_DET anyways and just no video. But in this case there is no detect.
So my best guess at this point would be Q8000.
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