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Post by mastertech on Oct 13, 2017 14:12:55 GMT -5
Did you put the inductor back in?
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Post by dobrykamil on Oct 14, 2017 7:16:07 GMT -5
Hi.
Not sure if this is the same case, but based on my experience, I would closely look at the hdmi receiver and transmitter chips.These ICs usually use +3.3V CPU, which is key rail for main microprocessor.I've had in my workshop av receivers with dodgy hdmi chips(shorted internally)preventing unit to switch on.
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Post by u2nmg93 on Oct 16, 2017 16:47:10 GMT -5
I did put the inductor back in as well. Is there an easy way to test the hdmi chips for shorts? Also do they receive the 3.3v even when the receiver is off?
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Post by mastertech on Oct 16, 2017 18:24:46 GMT -5
I don't get involved in shotgun replacing and I could tell you why this info is not relevant but i would much rather continue a proper trouble shoot. So until you are ready to get back to proper testing procedure i will drop out.
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Post by u2nmg93 on Oct 16, 2017 20:57:43 GMT -5
I'm all for the proper way to test and learning the reasons why we're doing what we're doing. Before I joined this forum I looked for the burnt or bulging parts and replaced those and when that didn't fix it I recycled it and got another. I don't have any formal training or education in electronics they've just always intrigued me. I don't know which comments are relevant or not or honestly how to read these schematics and figure out where to start and where to go from there. Sorry if I offended you, I really do appreciate the help.
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Post by mastertech on Oct 16, 2017 21:07:13 GMT -5
Oh no no no. You did not offend me at all.  I was just making a point that things need to be done in an orderly fashion to be successful. As long as you agree then we can continue. We need to find out why the ic you replaced still does not have an output. Let me look at the schematics again to see where to test next. |
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Post by mastertech on Oct 16, 2017 21:13:39 GMT -5
Receiver unplugged and your DMM on diode scale. Test between the ground you have been using and pins 4,9,5,6,8 of ic8961. Give me those readings. Then test between pins 3 and 4 and give me that reading.
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Post by u2nmg93 on Oct 17, 2017 9:00:38 GMT -5
Pin
4 1.8v
9 assuming it's the bottom of chip? 0v or short
5 1.9v
6 No flow
8 No flow
3&4 .548v and no flow with probes flipped.
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Post by mastertech on Oct 17, 2017 11:06:16 GMT -5
Pins 4 and 9 should be a direct connect to ground. Your pin 4 reading is not showing that. Recheck pin 4 to ground and if still not short, check solder joint or trace. You can look up the datasheet on the chip to verify pin locations.
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Post by u2nmg93 on Oct 18, 2017 11:32:29 GMT -5
Turns out solder joint was bad, went and re did it with an iron instead of the hot air gun. Receiver does turn on now and after it came on the display said "Please Update" press enter. I downloaded the firmware and put it on a thumb drive, updated via usb, took it maybe 30 seconds and it said "Complete!". Turned unit back on, I have sound but no video out. Forced the update which took about 30 minutes and still no video. Any idea where to go from here?
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Post by mastertech on Oct 18, 2017 13:41:12 GMT -5
Does any HDMI in detect input and is there any sound from HDMI in?
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Post by u2nmg93 on Oct 19, 2017 9:53:39 GMT -5
There is sound from HDMI in and bluetooth. The receiver is detecting the HDMI in signal. I turned on video and audio pass through and I still am not getting a video signal or sound at the tv with the receiver on or off.
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Post by mastertech on Oct 19, 2017 20:39:32 GMT -5
At least you are making progress. I guess we should start at the end and work backwards. First check the HDMI out socket mostly the contact traces to make sure none are bent up or damaged. Also make sure the cable end fits in the socket somewhat firmly. You can bend the gnd tabs in the socket to push harder against the cable end if needed. Then check the back of the socket to make sure none of the copper traces have been pushed back out of the socket. I had one once with this problem and no video. If all that looks ok then check for +5v dc at pin 18 of the socket. Might be easier to test at the back of the socket but use your own judgement. |
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Post by u2nmg93 on Oct 20, 2017 9:32:33 GMT -5
I checked the socket, nothing obviously bent or damaged. I put an hdmi cable into it and another of the receivers I have apart and have continuity between each of the pins from the back of each connector. I do have 5vdc at pin 18 of the output hdmi socket as well as pin 16 and 15.
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Post by mastertech on Oct 20, 2017 11:00:30 GMT -5
Test R8014, R8015 and R8035 for value. If ok the set your DMM to diode scale and go to HDMI out connector and test for short between any of pins 1,3,4,6,7,9,10,12. Then make sure there is good ground contact with pins 2,5,8,11,17.
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I was just making a point that things need to be done in an orderly fashion to be successful. As long as you agree then we can continue.
