Electronics > Repair

Yamaha RX-V473 repair. PS3 PRT: 094L [SOLVED]

(1/6) > >>

Comp_Sci_hater:
I recently bought a second hand Yamaha RX-V473 AV receiver. I bought it as faulty for 40$, after all i only need to replace C405 for it to work... right? ;D It was instantly going into protect mode afer i tried to turn it on, holding down TONE CONTROL, INFO and the power button allowed me to bypass the protect mode and check its history. The only problem that was being reported was PS3 PRT: 094L. The error code PS3 PRT: 094L means that the voltage on pin 106 (5.5V rail voltage monitor) of the IC21 (the processor) is too low. Of course i checked the 22nF cap on the ps board but it was almost perfect (23nF), without any visible ripple on the scope. The PS3_PRT line going into pin 106 is just a voltage divider hooked up to the 5.5V rail, from my calculations the output of the voltage divider should be equal to about 1.96V, and this is (down to the 3rd decimal place) exactly what i measured with my scope. From my understanding the 094L means that the voltage at one point dropped to (3.3/255)*94=1.21V which i think i would notice after turning it on and off a couple times with my scope hooked up to it. Is it possible that the microprocessor is just broken? What do you guys think i should do next?

Thanks in advance for any answers guys !!!

David_AVD:
Check that the sense resistors are still their correct values.

wasedadoc:

--- Quote from: David_AVD on September 05, 2024, 08:32:09 am ---Check that the sense resistors are still their correct values.

--- End quote ---
Seems you did not read and understand everything the OP wrote.

coromonadalix:
normally the PSx  is power supply   PRT is protection error  as guessed

i think your problems is elsewhere,  in the power supply section(s)

wasedadoc:
Which side of R223 are you measuring as 1.96v?

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod