Post by mastertech on Mar 24, 2022 15:34:09 GMT -5
HDMI inputs will not have any +5v on pin 18 when there is no connection. Only HDMI outs have +5v on 18 with nothing connected.
When a connection is made, the source device sends the +5v to the receiving device. If the receiving device is working correctly it will acknowledge the +5v and then send a signal back to the source device via the HP detect line. Once both devices acknowledge both signals then a connection is considered established and the devices will begin communication with each other.
When you checked the voltages did you check them on the chip or at the voltage regulators? Onkyo uses coils as fuses in these designs so if the other one blew, it could have caused one of the coils to blow open. You can either check each of them with a meter or check to ensure you have voltage at the pin.
Yes, I did. We talked about this on the last page. I have just placed an order, for 2 ICs. What I could do until then, is to measure the voltages, at the IC level. Which are the most important ones?
Todd, you ever had one, with the main board cracked(lifted one side)? I have solder joined those traces, and at some wider ones, I have placed component terminals to join them, but I still feel like, the soldered joint won't hold up. I'm referring to the tiny ones. Specially when I pop the board back in.
Ack, IIRC, the HDMI board is a multilayer board which means they have routing between some of the layers. If one of those is broken it would be a nightmare to find. You would have to test every single connection looking for an open. The fix would be to install bluewire to replicate the trace.
To be honest, you would be better off rebuilding another broken board. I have 1 working NR838 HDMI board and I may have another in a state of disrepair. Let me know if you would like me to search through my stash.
All of them are important. You need 1.3v, 1.8v, 3.3v and 5v.
Note that the HDMI subsystem takes all of its direction from the VMPU (Q8701). If this video processor isn't working properly, the HDMI subsystem won't boot. These devices are a royal pain simply because I have not found any way to program them except for the Onkyo firmware process and they are programmed in the factory to match up with the HDMI chips installed.
Yesterday I repaired a blown RZ820 HDMI board that had been hit by lightning (I suspect). The HDMI chips were missing when I received it and I immediately found that the MAIN CPU, the VMPU and the NET ARM processor were blown. I first replaced the MAIN CPU and after a ton of work using my Renesas programmer, was able to get it working (Onkyo sets the protection to on for all of their newer systems so you can't grab a working copy). Next, I replaced the VMPU with one from an NR838 and then added the 2 HDMI chips. At this point, the amp would turn on and I could get sound (the DSP was fine) but I couldn't update the firmware because the NET ARM CPU was dead. I checked the firmware revisions and found that the MAIN CPU was booting, the VMPU was booting and the DSP was booting but the OSD and the NET ARM firmware were all question marks. I figured the VMPU wasn't talking to the HDMI chips properly because the NR838 used SII parts while the RZ820 used Panasonic and thought I could fix it by simply updating the firmware so I removed the NET ARM cpu and replaced it with a good part from a dead RZ810 board I had purchased a couple of years ago. Now that I could update the firmware I had it run through the process only to have it fail every time at the VMPU. It seems that Onkyo uses different settings and I simply couldn't get around it so I ended up pulling the VMPU off the RZ810 board and installed that knowing that it used the same main HDMI chip as the RZ820. Only after all this work was I able to get the RZ820 working perfectly.
Last Edit: Apr 14, 2022 20:32:39 GMT -5 by tjmotter
Wow, that is a lot of work. Good job finding all the issues. I wouldn't be able to do all that. I'm trying to stick to simple amp issues, or maybe HDMI IC replacement. Lately I'm not to dedicated on repairing these receivers, since I'm about to start building a Locost(similar to a Caterham car). Picked up a mini mill and a mini lathe. I'm busy repairing and improving them. Eventually, I will take those measurements at the IC, because at the four coils I have those voltages.
Replaced the Q8302, updated the firmware again, and I have measured the voltages, and I don't really see nothing really off. 5.0SBVCC at pin #101 shows 4.87V, other voltages are 1.37V, 3.23V. Everything is still the same, no video. I have tried Main and Sub, and it still shows UNKNOWN at the input. Any other ideas would be appreciated.
nodols: Checked CPU doesn't give power to secondary CPU any idea what seems to be problem?
Jun 13, 2022 22:22:51 GMT -5
nodols: Repairing this Denon AVR 5800 dead to the world. checked fuse and power supply seems to be okay.
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julio: Hello, someone who can share the latest firmware update for the pioneer sc-lx56 please, I would greatly appreciate it, regards.
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jadi: Good afternoon everyone. I need help with CY920 Error on screen. Denon AVR x7200wa. What does it mean and how can I fix it? Tried reset and reboot but massage reappeared. Thanks
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nashou: How is everyone doing?
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nashou: Haavnt been here for a while!!!
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dinotech: Hi Guys... my Pioneer VSX-D1S is stuck in standby mode. resetting the amp didnt work. any help in getting it running is most appreciated.
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ali: i need help about onkyo txnr626 board no bchdm 1357 2 i buy a month ago dead i found something that a capistor number c8901 16v 100uf is missing plz guide me
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ali: i am new in electronics feild
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docsss: Hi, HELP ! I really need firmware DSP2 Q3401 for ONKYO TX-NR3007 . [email protected]
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timorenga: Gracias por aceptarme como miembro del foro, Estoy buscando manual de servicio para Denon AVR4310CI si alguien lo tiene se agradecería mucho que lo comparta Gracias
Jul 17, 2021 20:07:03 GMT -5