Saturday, September 16, 2017

Sayona SHT-1132BT Woofer repair dead now repaired

A few days ago I got a knock at my gate very early in the morning and I wondered what could have necessitated the visit and I almost came out armed.

Upon opening the gate I found one of my neighbor standing there holding a woofer and after excusing himself he told me that he wanted it checked urgently and he suspect it burnt after the power surge though I can’t remember experiencing any in my house.



I took the machine and kept it in my workshop which is within my house and went to work. In the evening I came back and went straight to the woofer and before opening I could smell something burnt inside and after opening this is what I saw.

Yes! The four bridge diodes were burnt beyond recognition.

Before continuing I decided to check if the transformer was gone or not and after dis-connecting it from the board I applied the power and I was able to test all the outputs and were okay and with this I concluded the transformer was okay.

To me this was a big relief since getting the spare for this kind of transformer is not easy in my place.


I decided to replace the four diodes and therefore I removed them carefully and replaced them, since the two fuses were okay I did not suspect any more components shorted.

I then decided to apply the power with the motherboard connected but since I was not sure if there were any other component shorted I decided to use my series lamp current limiter.


After applying the power I noted the bulb remained bright and this means there was still something shorted in the system.

To get the culprit I decided to use the touch method whereby after applying the power via the series bulb for a few minutes dis-connected the power and started touching main suspect component which are prone to shorting like transistors, I.Cs and I after touching one of the amplifier I.C TDA2030A I noted it was very hot for my finger and concluded this must be one of the culprit.


Also keen observation I noted one of its leg was dark meaning it was getting very hot to the point of changing the color as you can see the picture above.

I pulled it out of the circuit and again applied the power and this time the series bulb lite and then went off.

This is a good sign that no more shorted component in there and therefore got a replacement ic TDA2030A which was readily available in my store.

I replaced it and after applying the power I got aloud humming sound from the woofer and I concluded I may have finally got the system working again.
Here is the inside of the woofer



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64 comments:

  1. Dear Sir,

    Thanks for your useful classes, will you please explain me, How to add the USB port option in old CD player.

    ReplyDelete
    Replies
    1. add MP3 Decoder Board..

      Regards Humphrey

      Delete
    2. Hello sir . I have the same problems but how did u get the value of those burnt diod??
      Thank you

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    3. Use normal diodes...rectifier diodes.
      Regards Humphrey

      Delete
  2. My sayona lost the should. What could be the problem.

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  3. I would like my radio to be fixed where can I find your shop

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  4. My sayona transistors are hot and are meassuring a shot .what may be the ploblem ?

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  5. My sayona has just went off from functioning and i am told that the problem is the usb/sd port. Where can i get one thats made from sayona repair accessories

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  6. I need my sayona to be repaired how do I contuct u

    ReplyDelete
    Replies
    1. I need a replacement for my sayona cooker trivet and grid they got misplaced when still new

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  7. I need a sayonna sht 1148bt motherboard

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  8. My saying has aproblem with bass, sometimes there's bass na other time it's on there, any help pls

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  9. My Sayona woofer SHT-1134 lost bass and frequently goes off.what could be the culprit?

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  10. If your LED has a thick and well-made glass panel then you may have fewer issues with a compromised viewing angle or glare down the road. best smart tv

    ReplyDelete
  11. Hello, I have a sayona pps SHT-11488T.the is a problem with the bass I have tried repairing by replacing transistor but iam not successful. It was brought to my workshop from another workshop.
    Kindly if you have an idea on how the transistors are placed, assist

    ReplyDelete
  12. Hello, I have a sayona pps SHT-11488T.the is a problem with the bass I have tried repairing by replacing transistor but iam not successful. It was brought to my workshop from another workshop.
    Kindly if you have an idea on how the transistors are placed, assist

    ReplyDelete
    Replies
    1. Were you successful since got the same issue

      Delete
    2. Use 1943 and 5200 transistors for best output. Then check drivers 5551,5401, 2683, 1013 lastly resistors around if they have open replace with same value.

      Delete
  13. my sayona pps sht -1132bt 1s not displaying after powering it but i can hear the humming sound

    ReplyDelete
    Replies
    1. Check rectification replace diodes and also if capacitor have swollen replace also if needed. After there check the regulator 7805 output

      Delete
  14. Mine having the same problem with two diodes bridge is dark it is not performing well asist me wat to do

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  15. I need speaker change for my sayona woofer

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  16. Great.wgat other resistor can I use to replace a cerment 5W0.25ohmsJ resistor please.

    Thank you

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  17. Please can post the schematic

    Circuit diagram

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  18. My woofer does not produce any sound despite of it being on

    ReplyDelete
    Replies
    1. I have a question my sayona 1149bt can't produce bass but tremble is functioning well what might be the problem because it is using tip 41&42 for bass

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    2. Check the drivers transistor if any short replace .5401,5551,2386 ,1013 replace them. Then check main output transistor. Tip42(pnp) and tip41 (npn) .eqvaulent tip 42,(1941,688,1943)tip 41(d688 ,5198,5200)

      Delete
  19. What isthe price to the motherbord

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  20. My sayona woofer take long time to open after connecting to power what might be the problem......

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  21. My sayona woofer take long time to open after connecting to power what might be the problem......

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  22. I Need to know IC number os Sayona Model SHT. 1203BT

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  23. Price of IC of Sayona model SHT. 1203BT

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  24. How much is mother board of sayona sh11bt

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  25. I need motherboard for sayona sht 1148bt

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  26. My cecuit has buns beyond regognition no where you can replace the two diods do you have an image that can assist if I have to replace it with a rectifier.

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  27. Hallo I have a sayona1206 have a problem with bass please assist

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  28. Mine has no bass, its producing roaring sound.

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  29. That's great,i want to use the same model of transformer to a 2.1 amplifier is it possible and how?

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  30. How do i use the same transformer to a 2.1 amplifier

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  31. Diode burnt beyond recognition

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  32. How can I get sayonapps sht 1130bt motherboard

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  33. My sayonapps sht-11318T is not turning after connecting to power supply

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  34. How can i repar the speker cable

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  35. Do you have bass speaker 🔊 and it's how much plus the IC of soud

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  36. Thanks for your assistance. Now my question is, my sayona SHT-1217BT can't probably receive Bluetooth sometimes when you open till you restart several times. Other issue is that after working for sometime it produces some noise and it will not allow to adjusted anything be it volume or any other operations. It will just stick to what was going on before. Am in Mombasa

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  37. My sayona sound is just disappearing but the power is still on.. What could be the problem please

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  38. My woofer just went off bass line ,,using 41 and 42 tip

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  39. Hi I have Sayona SHT 1134BT - ..base not working because of resistor have been spoiled..can any any resistor affect the base like make it to produce bad base than usual

    ReplyDelete