Little Known Way To Solve Sony Mini Hi Fi Push Power Protect Problem
The complaint of this Sony HCD-RV6 Mini Hi-Fi was once you turned it On, you can see the message “Push Power Protect”. If you search from the Internet, it seems that lots of people are searching for the solution.
It can be caused by shorted wires in the audio speaker, shorted speaker, power related problem and bad Class AB 2 Channels AF Power Amplifier IC. As usual, in order to see the circuit board, one has to remove the back cover first-see the photo bellow:
You also need to remove the tray before you can pull out the circuit board.
From many previous repair case histories, the major cause of the Sony Push Power Protect Problem were due to the bad Class AB 2 Channels AF Power Amplifier IC and the part number was STK442-130-see the photo below:
Besides the IC, I also found 2 pieces of 100 Ohm resistors had an opened circuit and two 22uf 100 volt were bulged.
I had to buy a new IC for replacement and for the other parts I had them in my spare parts compartment.
Here is the STK442-130 IC schematic (hard to find datasheet) for you to refer.
Once the parts had been replaced and powered On, look at the result below:
Conclusion- The Sony hi fi push power protect problem seems to be very common in quite a number of models. What you need to do first is to check and make sure the output voltages from the power supply are good and no shorted audio speaker wires. If these checked to be good then you need to go straight to the amplifier IC section. Don’t straight away replace the IC and retest because sometimes corresponding components also can be the cause of the problem. All the best to you.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link:
https://www.jestineyong.com/most-popular-way-to-modify-lcd-tv-inverter-board/
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Albert Hoekman
February 2, 2016 at 5:52 pm
Thanks for sharing the article, nice job!
Earl Joshua Catalan
June 8, 2020 at 5:19 pm
I am so desperate that i can repair my sentimental valued SONY MHC-RV6. i can see sometimes in our city's electronic repair shop that the ic circuit board of SONY MHC-RV6 are replaced with TRANSISTORS and the board was also replaced can you give me some idea of that?
Thaha
June 21, 2020 at 10:23 pm
The power amplifere repairing by replacing the stk ic and associated power amp pcb parts is the best professional way to repair. It is done by professional technician and the IC is still available in market
Albert van Bemmelen
February 2, 2016 at 6:19 pm
Thanks for another nice Professional repair. Sony like Packard Bell and many others make devices for the Consumer Market at Home that often seem to be dropped into the Stores even before they apparently are thorougly tested. Which won't do them any good in the long run. The result is bad publicity all over the Internet by unsatisfied customers who will buy their next product from other Manufacturer's. Therefore it is a good idea not to buy any new product but to wait and afterwards buy any older product that earned its value. Recently I bought a second hand HDD/DVD recorder, and a used perfectly working Printer/copier on Marktplaats (Dutch daughter of Ebay?). And I know the devices are cheap and well produced!
Tito Kanshulu
February 2, 2016 at 7:15 pm
Thanks for sharing the information Suranga. Your explaination is quite comprehensive. I also,happened to come across a similar problem but the only culprit was a bulged capacitor.
Robert Calk
February 2, 2016 at 9:06 pm
Nice job, Suranga. Thanks.
Parasuraman S
February 2, 2016 at 10:11 pm
Good Job!
Mark
February 3, 2016 at 7:05 am
Hey Suranga,
Thanks for a well written article and diagnostic path.
I have been working on a Panasonic SA-HE70 Amp which comes up with a F70 code. It usually is a power issue at fuses etc, but mine has had other issues, including dry solder joints and faulty power amplifier. At the moment it is sitting on my workbench, just staring at me, taunting me, but as my confidence grows with my skills, I will tackle it again. I have a full schematic for it, which is a help, but for now time is a factor.
One day......
avatimus
April 1, 2020 at 5:45 am
I am having same push power protect problem in same model. I changed two 100 ohm resistor (they were faulty , open) , removed STK IC from power amp board and even disconnected "protect" pin from power amp board to main board.
The problem remained. Pls help.
gene
February 5, 2016 at 12:49 am
great article
Reychie canonigo
February 7, 2016 at 6:30 am
Nice job sir
Manoj
July 26, 2016 at 3:02 am
I have MHC RV5 MINI HIFI COMPONENT IC STK402 120S HAS BENN CHANGED STILL PROTECT PUSH POWER PROBLEM CHECKED CAPACITORS ALL SEMMS TO BE OK NO BULGED OR LEAKED WHAT COULD BE THE FURTHER PROBLEM
NEGLAY
October 25, 2016 at 10:57 pm
THANK FOR EXPLAINING.
karim metwally
November 9, 2016 at 11:50 pm
Is there is any solution to fix the ic by reprogramming it by somekind of external kit
Tesfaye kebede
February 16, 2017 at 11:46 pm
Thanks suranga a well written article
asanda
April 7, 2017 at 11:09 pm
My sony MHC-RG22 has display the protect push power what can be the cause?
reychie canonigo
June 19, 2017 at 3:32 pm
wow yo are awesome.
ahmed
July 10, 2017 at 3:31 am
hi i need some help about a no sound from my mhc rv5 when i power up it display " C81 " excuse my bad english email me any solution
Receive my cordial greetings from algeria
Priyadarshi Dutt
September 8, 2017 at 1:41 am
Hi Suranga,
Great article especially thanks for the supporting pics you posted.
I have Sony MHC V40. Its display stopped working long back. I was using this system by connecting mobile using aux cable to enjoy music under MD/Video option.
Recently sound also stopped working. And no response to remote also. Only power switch is working.
My friend said that it must have went into protect mode.
What can be the possible cause?
Changing STK402-100s ic will solve the issue?
Both display and sound..what else can be the cause..
Please help.
I badly want to make it functional..
One additional info.. Sometime back while playing song at louder volume suddenly disturbing sound could be heard..
I found out that speaker coil was partially broken near the joint at connection to frame..and spark in that damaged part produced that disturbing sound. That speaker I'll get fixed..
But the system needs to be fixed.
Kindly help me fix this issue..
Thanks in advance..
micheal
October 10, 2017 at 7:54 am
my keyboard Yamaha displays the program but there is no sound, what could be the problem?
Rotex
January 11, 2018 at 8:01 pm
Please, can a bad STK IC cause the unit not to power on completely?
Ndumbehson
March 1, 2018 at 8:58 pm
I removed the capacitor and put a new one but the problem is still there. So I am looking for the intergrated circuit STK 422-130 so I can replace it. Hope it works
Jeffy Mathew
March 3, 2018 at 3:24 pm
Where can I can buy The IC for this. It is not available here in kerala
José
July 31, 2019 at 12:11 am
J'ai un hmc-rv6 qui a cessé de fonctionner,j'ai vérifié l'alimentation et tout semble ok, l'écran s'allume mais anormal, j'ai essayé de chercher un schéma de cablage sur internet mais personne ne peut m'envoyer. Pouvez vous m'aider pour qu'on puisse remettre en marche mon appareil. Très cordialement
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I have a hmc-rv6 that stopped working, I checked the power supply and everything seems ok, the screen turns on but abnormal, I tried to look for a cabling scheme on the internet but no one can send me. Can you help me get my device up and running again? Best regards
Daniel
November 17, 2021 at 3:53 pm
Hello, I have a Sony CT790 soundbar, to which the subwoofer no longer connects with the bar. When plugged in, the LED is lit RED. When the ON button on the back is pressed, the LED lights up for a fraction of a second GREEN and then changes to flashing RED. I would like to know if the problem is from the power board (model: 1-980-622-11) or the motherboard (1-980-620-11). In principle, I would like if there is an electrical diagram of the power supply board or a diagram showing the voltage values between the pins (the 2 boards are connected through a 10-pin socket). The problem seems to be overheating protection. How can I solve the problem? Thank you very much!