I have this sony receiver and it doesn't power on at all...

Power Supply model: 09DAV-POWER-MR-MP-13
I started looking the power supply and fuse on it are ok.
At rectifier output i measure 32V dc

The red circle the output is 8V and on pcb it reads 32-0 32-0
So i suppose this is the problem but don't know how to find the defective part
Every part on pcb looks ok...

Any suggestions will be appreciated

 

Here you have the circuit diagram
http://elektrotanya.com/sony_hcd-hd..._hcd-hdx576wf_hcd-hdx675_sm.pdf/download.html
Try to replace C926; C912; C908; And check if 20V is present at Q901 emitter

 

Thanks alot Jony130. That was a big help!
I will replace the caps and see the voltage on Q901 and come back later.

 

Here you have the circuit diagram
http://elektrotanya.com/sony_hcd-hd..._hcd-hdx576wf_hcd-hdx675_sm.pdf/download.html
Try to replace C926; C912; C908; And check if 20V is present at Q901 emitter

without replacing the capacitors emitter of Q901 is 15,8 V
Tommorow i will have C926; C912; C908 new and will replace them...
I hope this will do the trick.

with C908 on pcb i measured at below marks on picture:

 

I have the PS circuit below.

 

Have changed the capacitors with new ones and problem remains
Strange thing is that volts at emitter of q901 is 1,6V
Before i replace the caps it was 15,8 V

Is the transistor defective? (Q901)
Any idea what to check ?

 

Can not find datasheet for the IC MR4020-7103 (IC921)
Anybody know where to search ?

 

The only think I find is this
https://www.shindengen.co.jp/product/semi/datasheet/MR4000.pdf

 

The schematic in post #6 shows both the base and emitter of Q901 strapped directly to Gnd. That can't be right?

 

Well i am back with not so good news
I powerd on the PS with 1,2 A fuse in place of FR929 and fuse blown and burned smell came from IC921 MR4020-7103

After that i replaced fuse (FR929) and without mains power connected i tested the resistance of IC921 and it is 28 ohms...

So this IC is dead i suppose and hard to find for replacment ?

In a store i looked i found only the one in first picture below(the burned out is second pic with long legs)

Will this work for replacement if i use wires to connect all legs as the old one ?

 

Have MR4020 (pic 1 above) installed after long and hard soldering of the pins it is ok and think it is working fine but reciever dosen't power on again

I need the datasheet of IC 901 STRF6138
Could not find anything about it...

 

As for the fuse. Next time use a 75W or 100W instead of a fuse. If you still have a short the bulb will glow bright the whole time but after you get the short cleared the bulb should come on for a second or two then go out.

 

I have this sony 5.1 home theatre system

Power Supply model: 09DAV-POWER-MR-MP-13, it doesn’t power on at all
I started looking the power supply ac input and dc output came out from rectifier diode, all are fine, but 32V and the rest of auxiliary voltages 4V, 6V are all missing.

Please advise what I shall do, is it due to STR F6168 IC failure?