I have picked up this receiver, which looks like it is brand new, with box and all the accessories, for $40. Usually, when there is a bad channel, it is easy to find, because there are shorted final transistors. On this one, they are all good. It does the amp diagnosis and shows Check SP Wires, at the end. Sometimes, it turns on normally without entering in this test and then it shuts down in like 30 seconds, or so. Other times, there is no display at all, because as soon as it turns on, instantly shuts off. I have tested all the semiconductors, at the amp and preamp section at all channels, and did not find anything bad. Maybe, there is a bad resistor, or capacitor somewhere?! I would need some ideas, on how to narrow it down to the bad channel. Also tested idle current, at each channel and I did not notice anything out of ordinary. Any help would be appreciated.
It is hard to find a sm for this model. It is in TX-RZ610. Do you refer to the two diodes(D7002/D7003) at the MCU? I'm measuring 0.24V, respectively 0.13V. To me, it seems like when the speaker relay turns on, then when the unit shuts down. After the amp diagnostic,it stays on, because the relay is not turned on.
In the service manual it shows that, if it comes up with Check SP Wire, that means that it is all good. But next time, if I reboot it, after a few seconds it will shut off. Than next time when I turn it on, it will check again the amps, that means that something caused it to do the test, right?
I would test right at the + speaker terminal for short to ground. I once had a new in box unit that had a factory assembly error where a speaker output metal strip was touching the chassis inside where it was hard to see.
I thought, that I should test for positive DC, at the speaker terminal. I did not see anything wrong there, except a few millivolt max. I have measured, at MCU pin #38(thermal) 3.28V. I haven't checked yet, what that means.
No short. For a few minutes I thought that is all good, I have listened to some Tune in music, I have even upgraded the firmware. At the next reboot, it went blank display again, just a click on and off. I have managed to get to the description screen, and it was showing Protection: I.
This is weird. Yesterday, I have listened to music for a few hours and it worked flawlessly. Today, I turn it on and it shuts down instantly. Than it makes an amp diagnosis, and it comes up with Check Speaker Wire result, which if I'm not mistaken, on this model that means that everything is OK. After that, I turn it on again, and it runs very well again.
lfcfan: Hi Todd, have been reading endlessly about the topic, and I really don't think that I'll be capable to 1. do the job myself as I don't have enough of the right equipment, and it looks like only the people who have access to TI exclusive distribution networ
Apr 9, 2020 17:17:06 GMT -5
skydronelink: Thank you I advance
Jan 29, 2020 4:01:41 GMT -5
skydronelink: Hi Repairaj, I have the same issue, but I am not able to get the cap value, I can tell it is the same board but deffirent rev cause of the side CAP is not the same value ! any idea how I can get the right burnt cap value?
Jan 29, 2020 4:01:31 GMT -5
skydronelink: Hello Jerme, thank you for the those images, is there is any chance to get the C2 (Cap) value or an image for it ? Thank you in advance.
Jan 27, 2020 23:15:06 GMT -5
skydronelink: Hello Sergio, I have the same issue, but I am not able to get the cap value, did find out what is the cap value?
Jan 26, 2020 18:01:17 GMT -5
jbmeyer13: Wolfy's Marquee isn't working? Did you spill a pint on it and short the MB?
Apr 25, 2019 8:32:28 GMT -5
wolfman: Always the same sarkasm Kurt that's why I never checked in until now. I knew you wouldn't give me a cheerful answer so let you hang for a while. Removed the last part you probably are a decent guy Eye to Eye.
Apr 19, 2019 18:55:30 GMT -5