Yamaha HTR-5450

Carlosraj

Member
2010-01-17 11:12 am
Hi

I need help with troubleshooting this Yamaha HTR5450 AV Receiver. When press Power ON, it shuts off within a sec. I downloaded the manual, and refering to the manual I entered the self diagnosis mode. In this mode, it shows "PS PRT 060" . Upon opening up the amp, the +5V and +12V regulators were blown. I replaced them and then it started working normal. The sound on the left channel was intermitent and I realised it was the relay contact, so opened up the whole amp and replaced the relay. Now after putting back the amp, it powers up and turns off within a second again. In the diagnosis mode it shows "PS PRT 000". upon entering the sub menu it shows "DC > 026 PS > 000". I think it indicates a power supply problem, but upon checking , all the regulators are OK and the +12V, -12V, +5V and +25V and -25V are present. the high voltages to the power amp read +54V, -54V. I do not understand why it is showing PS as 000. Can someone please assist.

Thanks
 
...Now after putting back the amp, it powers up and turns off within a second again. In the diagnosis mode it shows "PS PRT 000". upon entering the sub menu it shows "DC > 026 PS > 000"...
There's DC at the output of one (or more) of the channels;

Yamaha_DConOutput.jpg

Clear the 'Protection Log' and make sure that the errors are repeatable, and fix the duff channel(s).

Good Luck!
 
Last edited:

Carlosraj

Member
2010-01-17 11:12 am
I have checked all the components in the 5 output stages twice, and they are all OK. According to the DIAG menu, Menu 11-AD DATA CHECK sub menu a DC reading should be between 3 to 34, so this reading of 026, I guess is normal because earlier when the amp was working normal the sub menu was showing DC>027, PS>140. Also if there is a fault in the output stage, it will show DC PRT followed by the DC reading, if a fault in the Power Supply then it will show PS PRT followed by the PS reading. Also if it is a DC fault, the relay will shut down after 3secs, not instantly. Here it is showing PS PRT 000, which means 0V I guess. All the necessary power supply voltages are present, I checked. I am suspecting the CPU, can it be the problem, maybe it is not detecting the voltages


Thanks