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Sony Home Theater Push Power Protect Error Solved

By on April 6, 2020
home theater system repair push power protect

 

 

 

 

 

 

 

 

 

Sony home theater receiver model HBD-DZ810 came in with “push power protects” error now repaired.

This customer was referred to me by another customer whom I had repaired his Sony Bravia television which had backlight problem. After the phone call I visited the client and was shown the home theater receiver, testing was done in the presence of the customer to confirm what he said was the symptoms as my usual practice.

So I applied the power and the machine came up beautifully and then displayed “push power protects” on the screen and with that I confirmed the customer complaints. I took the machine with me to my workshop, opened it and did visual scanning and nothing seemed suspect.

sony home theater push button protect

I tested the power supply and found it was okay and all the output were within the expected range.

Next I removed the motherboard from the system and scanned the bottom side and again nothing seemed suspect.

sony home theater push button protect repair

So I decided to start testing the diodes above and I bumped on one which had reading both ways and from my electronics class was told a diode is a one-way valve and should not have reading both ways(resistance)

To be sure I lifted one pin from the circuit and re-tested again and still got the same reading (both ways). Since this diode was at the output of the amplifier circuit I was very sure this was the cause of the problem. The diode of labelled D3101, to be sure the exact diode type I had to google this model and I got the service manual from the internet effortlessly.

sony home theater push button protect repair and fix

From the circuit diagram I was able to see the diode was actually a 39 volts Zener diode, having no smd 39 volts Zener diode I bought an ordinary 39 Zener diode and replaced it.

I re-assembled the machine quickly and very happy for the quick fix and applied the power again and with my eyes fixed on the display, after booting there again I got the “push power protects” error.




Actually it was like nothing was changed, I again removed the motherboard and decided to do more investigation on the motherboard and first I checked the replaced the diode and found has reading both sides, I soldered it out and after testing out of the circuit I noted it was okay.

This lead me to suspect that maybe the reading I am getting both ways when the diode is in circuit could point to an internal short on the digital power I.C (IC3100) which in my case was CXD9981TN.

CXD9981TN ic

To be sure if the I.C.3100 was causing the problem I removed it out of the circuit and replaced the zener diode. I re-assembled again and applied the power but this time without much expectation and after booting up this is what I saw.

how to fix sony home theater

The machine no longer goes into protection mode, I connected the speaker for testing purposes and I love what I heard. Nice, soft and soothing music coming out of the machine. Since this I.C was not in my market, I ordered it online from China and because of the outbreak of Covid-19 there was a lot of delay in shipping the part to Kenya.

I explained this to the customer and requested him if he can be using the machine without one amplifier and he agreed. I took the machine back and paid me ¾ of the total charges, we agreed that when the market is back to normal will replace the faulty I.C.

After testing the machine, the client was happy and I left it at that, now it is over one month and customer has not called with any complaint and therefore I hope he is still enjoying.

You can learn more about home theater repair by reading my DVD player repair guide sold here.

Thank you friends. Take care and maintain social distance.

humphrey kimathi

Humphrey Kimathi is from Nairobi Kenya and the author of:

1) Lcd-Led television repair guide

2) DVD Player repair guide,

3) CRT Television repair course and

4) Basic Electronics course.

He is also a blogger at Electronicsrepairmadeasy.com

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Note: You may check out his previous post in the below links:

https://jestineyong.com/hot-keep-on-shorting-immediately-after-replacement-now-repaired/

 

Likes(54)Dislikes(1)

32 Comments

  1. Yogesh Panchal

    April 6, 2020 at 4:34 pm

    Good job! Sir,

    Always testing suspected components off the board is good practice else it is very time consuming process specially in laptops.
    Because of unavailability of spare/components most of equipment are going to dump yard now a days.

    Likes(2)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 12:55 pm

      Thanks and well put Yogesh.

      Regards Humphrey

      Likes(0)Dislikes(0)
      • Francis Benson Muniu

        April 24, 2020 at 1:48 am

        I have a Sony Hometheatre D340 which has same problem I put it on plays for like 20 minutes then goes off and displays push power protect on the LCD screen.

        What could be the problem. And how much would it cost me to fix it permanently.
        With Regards

        Francis Benson

        Likes(0)Dislikes(0)
  2. Parasuraman S

    April 6, 2020 at 4:59 pm

    A time consuming job, but got result finally. Good job there! Yes, this Virus has paralyzed almost all human activities! What to do! Let us hope and pray for early restoration of normalcy around the world!

    Likes(2)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 12:59 pm

      Sure, scientists has no solution for this pandemic, our help will come from the sky(heaven) to quote the prime minister of Italy.

      Regards Humphrey

      Likes(1)Dislikes(1)
  3. Mark

    April 6, 2020 at 6:09 pm

    Well done Humphrey, good logical testing.

    Likes(1)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 1:00 pm

      Thank you and welcome Mark.

      Likes(0)Dislikes(0)
    • Imoudu Onwumah

      April 11, 2020 at 4:45 am

      Focus mind and suspection are two of the keys to electronic repairs.Good job.

      Likes(1)Dislikes(0)
  4. Mark

    April 6, 2020 at 10:24 pm

    Well done. I had a similar experience with my own Sony Home theater. I took it to one of the experienced technicians but to no avail. After reviewing some YouTube videos decided to use hot gun on the area around microprocessor. To borrow your expression ‘ I liked what I heard.

    Likes(1)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 1:03 pm

      I like what i hear Mark, Congratulations my friend!

      Likes(0)Dislikes(0)
  5. Albert van Bemmelen

    April 6, 2020 at 10:26 pm

    Pro job with hopefully a safe ending as soon as the ordered chip has arrived and is added to the circuit board.
    The mentioned virus indeed is not helping humanity in any way. But not exactly like in 1918 when also millions of people got infected and also died. Because now we know how to prevent infection and even know what virus infects us.
    I ordered and paid for a book through Amazon from Bibliotext.com on 1 March but that book got somehow lost and the tracking didn't make any sense either. Likely because the seller in India couldn't provide any correct information and/or send the book in time because also India suffers from the Corona epidemic now. And apparently the Indian government put all other foreign activities on hold. And I hope the book (on VHDL) still arrives in a couple of weeks as soon as the virus is under control.

    Likes(3)Dislikes(0)
  6. Andrew F. Ali

    April 7, 2020 at 12:03 am

    Well done. Good practice.

    Likes(0)Dislikes(0)
  7. Waleed Rishmawi

    April 7, 2020 at 5:30 pm

    a very good job on the repair. from experience, it is always good to check for related components when finding a questionable parts on board other wise it is time consuming and tiring. have a blessed day and thanks for sharing.

    Likes(0)Dislikes(0)
  8. DOĞAN

    April 7, 2020 at 8:13 pm

    Greetings from Turkey.
    A very good article.

    Likes(1)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 1:10 pm

      Greeting received in Kenya DOĞAN, thank you.

      Likes(0)Dislikes(0)
  9. Joshua Oloo

    April 7, 2020 at 9:55 pm

    Good job Hum.and God bless the work of your hand.

    Likes(1)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 1:11 pm

      Blessings received with BOTH HANDS,thank you bwana Oloo

      Likes(0)Dislikes(0)
  10. Francisco Rica

    April 8, 2020 at 6:30 am

    Good job Humphrey!
    I have a question about the first diode with two read. What was your two reads (forward and reverse) on-board and of-board for this diode?

    A time ago I read a repair blog when the repair-man said that a diode with two reads, must have similar two reads values. He measured an on-board diode with a forward read of 0.43 V and a reverse read of 0.83 V and say that it don't worry him becouse the reversed read was much high than forward read.

    Thanks.

    Likes(0)Dislikes(0)
    • Humphrey Mndaka

      April 8, 2020 at 10:52 am

      Hi Rica,
      Yes, the diode had same reading both in circuit and out of circuit both ways, actually had a beep.
      Regarding your question on diode having two reading, Yes, for zener and fast recovery diodes using analogue meter on 10K range you will get low reading and near infinite(small kick) when you reverse the probes.

      Regards Humphrey

      Likes(1)Dislikes(0)
      • Francisco Rica

        April 8, 2020 at 10:22 pm

        Thanks Humphrey for your response! But the diode was leaky? what was the voltaje drop in both ways?

        Likes(0)Dislikes(0)
        • Humphrey Mndaka

          April 9, 2020 at 1:25 pm

          http://www.electronicrepairguide.com/testing-diode.html

          See the above link for more info on testing diodes.

          Likes(0)Dislikes(0)
  11. Robert Calk Jr

    April 8, 2020 at 11:18 am

    Good job, Humphrey!

    Likes(1)Dislikes(0)
    • Humphrey Kimathi

      April 8, 2020 at 1:13 pm

      Thank you my friend Robert, pray you are safe back there in the USA

      Likes(0)Dislikes(0)
  12. Gassan Ali

    April 8, 2020 at 7:41 pm

    Great work! Persistance leads to success.

    Likes(1)Dislikes(0)
  13. Sylvester

    April 8, 2020 at 8:20 pm

    Keenly following. Sylvester Takisi from Kenya. Corona related delays have also affected me.

    Likes(0)Dislikes(0)
    • Humphrey Mndaka

      April 9, 2020 at 1:32 pm

      Thanks for following and passion you have in electronics Sylvester. Like I told you when you attended my seminar, i will be looking for you at the TOP.
      Regards Humphrey

      Likes(0)Dislikes(0)
  14. Tito Kanshulu

    June 4, 2020 at 4:44 pm

    Well written and informing. I just love that Humphrey. Thanks for the job well done.

    Likes(0)Dislikes(0)
  15. nader

    July 7, 2020 at 11:47 pm

    hi
    You are a good repairman.
    You are very good at troubleshooting...

    Likes(0)Dislikes(0)

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