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Great Idea To Solve Sony Push Power Protect HBD-TZ210 Problem

By on April 1, 2016
sony home theater system repair









sony hbd-tz210 home theater system repair

Customer sent to me this Sony HBD-TZ210 home theater system with the complaint of “push power protect”.

In fact this kind of problem is very common in home theater system and mini hi-fi. You can read my previous article about push power protect in Sony Mini-Hi-fi in the below link:

Push Power Protect HBD-TZ210 Repair

Once the cover was removed I could see the power supply board, main board and the main amplifier section-see the photos below:

home theater repair


I focused on the sound and pre-amplifier board and resoldered all the ICs but the problem remained the same.

home theater repairing


The next step was to remove all the three sound ICs to isolate the problem. The sound IC part number was CXD 9965 TN and available from the local market.

sony home theater repairing

cxd 9965 tn ic

After removal of the sound ICs, I then powered it up to check if the error message (push power) still display or not. I was happy to see that no error message appeared and the player starts to read DVD disk. In fact this is one of the great ideas to solve the push power problem.

how to repair home theater


I concluded that one or may be more than one of the sound ICs were having problem causing the push power protect problem. Replacement with the 3 new sound ICs solved the problem. The photo below is showing that everything was working fine.

how to repair home theater system




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:





  1. albert van bemmelen

    April 1, 2016 at 5:37 pm

    A great job Suranga as always! The CXD9965TN chips only cost $6.00 a piece so replacing the old ones was not a question of costs.
    However I wonder if you were not able to disable the 3 chips separately by just cutting the Vcc lines or Enable signals going to any of them?

    Maybe only one of these was bad and that would save a lot of time and soldering work.
    I tried to find a datasheet of this chip to find its powerlines but I couldn't find any data. Which states that it was easier to buy one then to study them.

    • Paris Azis

      April 3, 2016 at 4:14 am

      Hey Albert

      I agree with you. At least this is what I would try to do. To locate the defective one. And this because I believe, although there is no proof, that only one of them was defective...As with car batteries...Always one cell fails rendering the entire battery useless...On the other hand, apart from those (2x6)$ thrown in the garbage bin, the PCB suffered two unnecessary "surgeries" and this is what I always try by any means to avoid...
      Anyway, as regards the time parameter, Suranga's method is the right one.


      • Albert van Bemmelen

        April 3, 2016 at 11:55 pm

        Indeed Paris, Time is always a Factor. But I was thinking like maybe the bad chip didn't get hot. And in that case knowing this also could save Time and Money. Or vice versa maybe only the bad Chip got hot?
        Which would be of great help if the same kind of device would pop in for another repair like this one any next time. I am just thinking out loud.

        Thanks for your reply!

        • Paris Azis

          April 5, 2016 at 10:38 pm

          Hi Albert

          That’s why in the past, when running my own repairs business, I used in such cases to detect the current in the return path of the power supply in order to locate the culprit.
          Well, I have the relevant article ready long ago in order to be sent for publishing in this blog but I lost the necessary test jig I had made and used at that time.
          Worse than that, I cannot find its schematic diagram in order to rebuild it again.
          And my memory fails to “retrieve relevant data from hard drive”. I don’t remember the circuit…
          Although I have tried some simple designs of my own, they failed. All of them had during the tests a tendency to oscillate. You see the amplification factor is had was very high, around 10000.
          The tests method was based on Ohms Law again. I was measuring with the jig microvolts across a few centimeters of the PCB foil tracks and by amplifying these micro-voltages into the volts range it was possible to use an ordinary (cheap) multimeter in order to locate the shorted component. These amplified volts were the picture of the running current through the track. This is an absolutely fail-safe method in order to resolve enigmas like these cases.
          As soon as I succeed with a new jig I will send the article to Jestine.

          Best Regards

          • Albert van Bemmelen

            April 6, 2016 at 5:29 pm

            Understood Paris. I know what you mean about finding the
            lowest shorting resistance on a pcb board. I had examples on
            Laptop mainboards with about a dozen parallel switched
            Capacitors of which only one Capacitor was the cause of the
            problem why the pc system wouldn't start. I used to connect
            a low Voltage on the Board with a highest Amperage available
            that caused the, as a low resistor acting, short circuiting
            Capacitor to become hot or even go up in smoke! Saving the time
            having to check every Capacitor on the Mainboard. But now I use
            also some of the very low Digital Resistance Meters available.
            But checking the low Ohmic values still is tricky knowing todays Microprocessors only need about 0.9Volts or less at those very
            high Currents. I am looking forward to your article describing
            that jig you mentioned. I hope you'll be able to recuperate the
            old Data. It could be a better more promising way to use in
            cases all other methods fail? Thanks!

          • Robert Calk

            April 6, 2016 at 8:45 pm

            Hi guys,
            I wonder if that is what the "Leak Seeker" does to find shorts?
            I am also waiting for that article! It will be very interesting.

            • Albert van Bemmelen

              April 7, 2016 at 6:40 pm

              I tried to see how a "Leak Seeker" exactly works Robert. But I
              haven't found any Operating Guide of such a device yet. But I
              noticed that the Seeker model 82 was no longer sold or produced.
              It has no "jig" obviously since there are only a Ground crocodile
              clip and a red Testpen attached to the Device.

  2. Yogesh Panchal

    April 1, 2016 at 7:50 pm

    Good Job,

  3. Robert Calk

    April 1, 2016 at 8:20 pm

    Good job, Suranga.

  4. Parasuraman S

    April 1, 2016 at 10:58 pm

    Good job! Fast fault finding due to your experience! That is what counts ultimately!

  5. Humberto

    April 1, 2016 at 11:57 pm

    Good repair Suranga. Congratulations.

  6. Ezekiel

    April 2, 2016 at 4:24 am

    Nice job keep up.

  7. Ernst

    April 2, 2016 at 5:12 pm

    Hi Suranga. Thanks for the tip because i have the same problem and know now how to fix it

  8. Suranga Electronics Sri Lanka

    April 3, 2016 at 12:48 am

    Hi All,
    Thanks so much for your comment !

    • Eric

      April 16, 2019 at 4:24 pm

      Can the Sound IC u posted also work wth DAV-TZ715 sony home theater

  9. Paris Azis

    April 3, 2016 at 3:59 am

    Good job, Suranga.

  10. ramli

    April 3, 2016 at 11:09 am

    good job mr.suranga

  11. suranga bandara, Suranga Electronics

    April 3, 2016 at 1:32 pm

    Hi All,
    Thanks for all the comments.

  12. Tito Kanshulu

    April 3, 2016 at 7:27 pm

    Good work Suranga. In Malawi it is not easy to find those ic. We just remove the culprit and let the remaining ones continue their work.

  13. Kevin Gardner

    April 4, 2016 at 12:24 am

    Another great repair to save unit from adding to the E-Waste stream. On a different note I sure would like to have a way system added to this blog that requires people to have to explain why they "dislike" the article before they can post a "dislike" mark. Either we have a "Troll" here or someone must think that they are of a higher order of intelligence than the article author.

    • Jestine Yong

      April 4, 2016 at 7:55 am

      Hi Kevin,

      Thanks for the feedback but sad to say there is no such function for it. If you look at Youtube videos, even the videos with super good repair info, there are still dislike. Even a nice movie and nice songs there are still dislike.


  14. Sanjay nanda

    April 9, 2016 at 2:37 pm

    How to repair push power tz-230. Sony

  15. Hashim salim

    January 20, 2017 at 8:32 pm

    Hi?iam shoke from having a problem with power supply circute.its complitetly dead.the idea of buying a new one to very good the problem is i actual do know where in kenya i can get this this gives me headache.can somebody plz help me.atleast to find the components. I suspect str located at the board my have something to do with this help is my hope thanks.

    • Martin Gitzs

      October 11, 2017 at 8:45 pm

      Which str do you require?

  16. ejk

    May 16, 2017 at 1:35 pm

    remove sound ic and preamp drivers but err message show same no change.....

  17. sibs

    July 21, 2017 at 1:21 pm

    Hi I have model DAV-TZ145 sony dvd player. but it showing protect mode. I reset to factory default remain same. Can you help me how to fix this?

  18. Dhirsing

    September 16, 2017 at 2:26 am

    I opened all three ic cxd 9965 yet problem remain ed same push power protection what can I do next step 30 voltage is not present

  19. bijoyjoseph

    September 20, 2017 at 6:39 pm

    Hi I have model DAV-DZ290K sony dvd playerthe problem was push power protection . Is this model have the same IC (cxd 9965). The technician told me Amplifier IC also has the problem . Where will get the IC's It is not available in the market. what can I do ? Can you help me ?

  20. Dev Aggarwal

    October 24, 2017 at 9:12 pm

    Hii I have a sony DAV-DZ 370 Home Theater System there is also problem of push power protection. So what can I do there is no IC in market. Can you help me?

  21. amit khanka

    January 18, 2018 at 9:38 am

    Hi suranga,
    My sony home theatre system DAV-DZ340K keeps changing functions on its own i have connected my samsung led tv with the theatre and the theatre is always set on tv mode. But it keeps changing to dvd mode.. its getting a alot frustrating for me as i'm not able to watch tv in a constant flow..please help..

  22. Gopal Pradhan

    May 29, 2018 at 7:56 pm

    i have Sony DAV-DZ650 DVD Home Theatre system and right now its has been very low sound output while our volume is 35 and maximum volume. so please help me to reslove this issue.

  23. siva

    September 4, 2018 at 6:02 pm

    Hi in my sony home theater system power to audio board is showing 40v instead of 32 or 31.5 is this the problem or audio ics?


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