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Post by tibimakai on Dec 8, 2018 22:56:22 GMT -5
Ha ha, I was about to ask you, about that Q8151, but you have already posted about it.
I will measure that, and I will let you know. Thanks
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Post by tibimakai on Dec 9, 2018 0:07:57 GMT -5
OK, I have measured it.
5.1V in(pin #1) and 0.267V(pin #5) out. D8151 shows both ways 0.63V.
Should I remove D8151 and check it out of circuit, or Q8151 is bad for sure?
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Post by mastertech on Dec 9, 2018 11:21:29 GMT -5
OK, I have measured it. 5.1V in(pin #1) and 0.267V(pin #5) out. D8151 shows both ways 0.63V. Should I remove D8151 and check it out of circuit, or Q8151 is bad for sure? What about pin 3 ?? |
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Post by tibimakai on Dec 9, 2018 14:54:36 GMT -5
Forgot to measure that, sorry about that. It is 3.23V.
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Post by mastertech on Dec 9, 2018 15:51:01 GMT -5
Well it looks like you have input voltage and it looks like it is being turned on so you just do not have any output or the output line is being pulled down. That diode reading does not seem to indicate anything.
Is the ic getting hot or is it warm or just stays cold. If it is staying cold then I would think the ic is probably no good.
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Post by tibimakai on Dec 9, 2018 17:32:40 GMT -5
It's under the HDMI board, most likely I won't be able to touch it.
Do you know, if I would remove the backplate of the receiver, it would still work, or that plate is needed for grounding purposes?
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Post by tibimakai on Dec 10, 2018 18:23:55 GMT -5
I have managed to "feel" that area, and nothing was hot.
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Post by tibimakai on Dec 12, 2018 0:50:38 GMT -5
The output of Q8151 measures 4.5Kohm, so it is not shorted.
This IC is most likely bad. The bigger problem is, that is not available.
I have even contacted Digikey, and they couldn't help me.
I had an idea, to start looking in the service manuals of the receivers that I have(609, 717).
Hurraa, found one in the 609. It is used for the same purpose.
Replaced it, and now I have 5V at pin #18 at the HDMI OUT.
Unfortunately, there is still no audio and video on the TV.
Next, I will go over Q8000 soldering. Maybe something is not soldered properly. I will need to poke each pin, with a needle.
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Post by tjmotter on Dec 13, 2018 7:36:21 GMT -5
The output of Q8151 measures 4.5Kohm, so it is not shorted. This IC is most likely bad. The bigger problem is, that is not available. I have even contacted Digikey, and they couldn't help me. I had an idea, to start looking in the service manuals of the receivers that I have(609, 717). Hurraa, found one in the 609. It is used for the same purpose. Replaced it, and now I have 5V at pin #18 at the HDMI OUT. Unfortunately, there is still no audio and video on the TV. Next, I will go over Q8000 soldering. Maybe something is not soldered properly. I will need to poke each pin, with a needle. It is time consuming but I ALWAYS check each pin after soldering a big chip like this. Even when a visual inspection shows no solder bridges I often find a couple of pins that are either not soldered well to the pad or are shorted to the pin next to it. BTW, this might be why you have no video on the RZ800.... |
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Post by tibimakai on Dec 13, 2018 11:18:10 GMT -5
Most likely you are right. In the past, I have always found a few pins, that were still unsoldered.
The excitement to try it out, is to great to resist.
With the RZ800, there are to many issues.
Lately, I have picked up two Xbox One S consoles to repair ($40 & $50), one had a bent metal inner case and the other just needed to be reset.
I have upgraded the HDDs, to bigger ones.
That is, why I have neglected the RZ800.
I will have to clean up that Micon, to be able to send it to you.
I'm buying a microscope for myself(Christmas present), in separate parts.
The idea is to save money, so I will try to use, a dual monitor stand(gas spring type, with this the load can be adjusted) for the microscope and a monitor.
Another idea that I have is, to modify a GoPro Hero 5 camera, to be used as a camera for the microscope. The ones on the market, are way to expensive. And I'm a machinist.
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Post by tibimakai on Dec 14, 2018 1:08:23 GMT -5
Yeap, that what it was. Went over with the soldering iron and it's working great. Didn't even bother trying each pin.
Thank you very much, for all your help.
Now, back to the RZ800.
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