Hi everyone. I have this AV reciever Pioneer VSX-421-K. I didn't use it long time and last day I decided to power it but not working.
When i push the power button, nothing happened. I tried to reset it with (BAND + STAND BY/POWER) buttons but nothing going on, also tried with (ALC/STANDART SURROUND + STAND BY/POWER), the result is same. Nothing. After pushing at the same time (ADVANCED SURROUND + STAND BY/POWER) relay is clicked and device turned on but for only 2 seconds and turned off again.
I opened the device to check the main fuse and it's OK. I checked transformer also and it's working. After this i checked the Amp board transistors, and i found two broken on front right channel and replaced them, but problem with turning on is same.
There is nothing hooked up to reciever like TV, Plastation or speakers.
=== Update (09/30/23) ===
Yeah, sorry for that there is photos. Replaced transistors is for front right channel (2sd2390 and 2sb1560)
[image|3087840]
[image|3087841]
And that is other visible pcb board
[image|3087844]
Hi everyone. I have this AV reciever Pioneer VSX-421-K. I didn't use it long time and last day I decided to power it but not working.
When i push the power button, nothing happened. I tried to reset it with (BAND + STAND BY/POWER) buttons but nothing going on, also tried with (ALC/STANDART SURROUND + STAND BY/POWER), the result is same. Nothing. After pushing at the same time (ADVANCED SURROUND + STAND BY/POWER) relay is clicked and device turned on but for only 2 seconds and turned off again.
I opened the device to check the main fuse and it's OK. I checked transformer also and it's working. After this i checked the Amp board transistors, and i found two broken on front right channel and replaced them, but problem with turning on is same.
There is nothing hooked up to reciever like TV, Plastation or speakers.
=== Update (09/30/23) ===
Yeah, sorry for that there is photos. Replaced transistors is for front right channel (2sd2390 and 2sb1560)
[image|3087840]
[image|3087841]
And that is other visible pcb board
[image|3087844]
Hi everyone. I have this AV reciever Pioneer VSX-421-K. I didn't use it long time and last day I decided to power it but not working.
When i push the power button, nothing happened. I tried to reset it with (BAND + STAND BY/POWER) buttons but nothing going on, also tried with (ALC/STANDART SURROUND + STAND BY/POWER), the result is same. Nothing. After pushing at the same time (ADVANCED SURROUND + STAND BY/POWER) relay is clicked and device turned on but for only 2 seconds and turned off again.
I opened the device to check the main fuse and it's OK. I checked transformer also and it's working. After this i checked the Amp board transistors, and i found two broken on front right channel and replaced them, but problem with turning on is same.
There is nothing hooked up to reciever like TV, Plastation or speakers.
+
+
=== Update (09/30/23) ===
+
+
Yeah, sorry for that there is photos. Replaced transistors is for front right channel (2sd2390 and 2sb1560)
Hi everyone. I have this AV reciever Pioneer VSX-421-K. I didn't use it long time and last day I decided to power it but not working.
When i push the power button, nothing happened. I tried to reset it with (BAND + STAND BY/POWER) buttons but nothing going on, also tried with (ALC/STANDART SURROUND + STAND BY/POWER), the result is same. Nothing. After pushing at the same time (ADVANCED SURROUND + STAND BY/POWER) relay is clicked and device turned on but for only 2 seconds and turned off again.
I opened the device to check the main fuse and it's OK. I checked transformer also and it's working. After this i checked the Amp board transistors, and i found two broken on front right channel and replaced them, but problem with turning on is same.
There is nothing hooked up to reciever like TV, Plastation or speakers.