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Old 01-20-2020, 03:10 PM   #1
mferna14
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Default Pioneer VSX-531

Does anyone have the Schematics diagram for Pioneer VSX-531???
The HDMI LED starts to blink & this is the protective mode. I checked all the Transisors array on the power transistor board, all the transistor seems to be fine, but as soon as I plug the cable into CP403 socket, the HDMI starts to blink. This cable is coming out of the main board at the botton where the big caps are located & out there too I do not see any short. Without this cable attached the receiver works fine & the display & all modes works fine. means something short???
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Old 01-21-2020, 06:49 AM   #2
madan1
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Default Re: Pioneer VSX-531

Have you checked the schematics of the previous models?
I'm sure pioneer uses the same power amp board in previous models. Most likely you will find and the schematics of the smart parts ( the mainboard(s) ) but with some ICs missing.
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Old 01-21-2020, 10:30 AM   #3
SMDFlea
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Default Re: Pioneer VSX-531

This service manual might help https://elektrotanya.com/pioneer_vsx.../download.html

Last edited by SMDFlea; 01-22-2020 at 05:21 AM..
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Old 01-21-2020, 05:07 PM   #4
R_J
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Default Re: Pioneer VSX-531

CP403 supplies B+ and B- for the amp outputs. You likely have shorted output transistors in one or more channels. Check the voltage on each pin of CP402, they should be near 0 volts

Last edited by R_J; 01-21-2020 at 05:11 PM..
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Old 01-21-2020, 06:04 PM   #5
madan1
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Default Re: Pioneer VSX-531

Quote:
Originally Posted by R_J View Post
CP403 supplies B+ and B- for the amp outputs. You likely have shorted output transistors in one or more channels. Check the voltage on each pin of CP402, they should be near 0 volts
Hm, you just made me download some VSX manuals... damn, when I first saw "pioneer" and "8kg" for a 5channel AVR I immediately thought - class D amp!
The lightest AVR with similar output specs that I've seen was 12kilos... but damn.. accounting and marketing departments at their best!

Anyway... op, download the service manual from the link in the above posts and see how to enter the service mode. Try to see the recorded errors with disconnected CP403
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