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I am the guy with the sony KV27S42 tv. I have a B+ overcurrent indication. My question is as follows: Supposedly the set shuts down after 7 vertical traces. The set stays up for 4 to 5 seconds before it shuts off the power relay. Does it turn off the flyback immediately so that I would not be able to voltages on its terminals or does the unit stay on for the 4 to 5 seconds that power is on? I can't get any voltages from the flyback.

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  • schmitt_alvi May 02, 2010

    Hi -- I disconnected the collector of Q502 which is the Horizontal Output from the foil. I left all other parts connected including the flyback transformer. The error light changed from a two blink to a four blink which indicates that +13 volt was not available. So that indicated to me that the flyback was working producing the +13 volts when the Q502 was connected. Maybe what is to sense the +B overcurrent is not working or pin 18 of IC301 which senses the B+ overcurrent is bad. What do you think? Thank you. Alvin....

  • schmitt_alvi May 02, 2010

    I get 135.7 volts (is that B+ or is it the 200 volt line?) I disconnected the 135 v connection from the flyback. I disconnected the collector of the Horz Output transistor going to the flyback. I still get 135V. Disconnecting the C of Horz Out with the flyback caused the +13v supply to not appear causing the 4 blinks . If the +13 is working could the flyback still be bad?

  • schmitt_alvi May 02, 2010

    Now, after resoldering the pin back in circuit I do not get 135 v at that flyback pin. Also I do not see the heater voltage when I turn on the TV. Should the heater V be on while the few seconds that the TV stays on? Thanks for all your help.

  • schmitt_alvi May 02, 2010

    I am going to replace the flyback transformer. I will leave a note when done. Yes you have talked to me before. The set is a SONY KV27S42 BA4D chassis.

  • schmitt_alvi May 02, 2010

    I removed and replaced the flyback. The set comes up now but makes scary noises of a high voltage nature. It stays up for about 15 seconds before shutting itself off - Shows a green raster with the set trying to develope a totally green screen without any raster. I hooked up a tv signal generator and placed the set at channel 3. I see a wide (2 inch) raster along with a set of closer lines which may be the signal generator output. It still shuts off, now after 15 seconds, and blinks the light twice indicating the B+ overcurrent still.

  • schmitt_alvi May 02, 2010

    SD provided all the help I needed. The only better thing would been if he was here fixing it himself. Great Guy!!!!

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  • Master
  • 5,138 Answers

2 things Check video IC on CRT board,disconnect the CRT board on neck of tube then turn TV on.Also near high voltage FBT 47uf 160v cap or 100uf 100v capaitor.

Posted on May 02, 2010

  • ladywinn
    ladywinn May 02, 2010

    I think you are going to find Bad Tube,heres what happens tube begins to short and in return set burns FBT, it isnt untill you replace FBT that you will discover defective Tube.

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  • Televison & ... Master
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FIRST: trouble shooting suggestions:

1. Locate the pin where the b+ enters the flyback and unsolder it.

2. Locate the pin where the collector of the Horz output connects to the flyback AND unsolder it also; check for full b+ on the foil going to the flyback from the power supply---it should be in excess of 130 vdc and use the correct ground when you do this.

If voltage returned at the source going to the flyback the problem is either the transformer or something near it. If voltage does not come up at the source going to the flyback with both pins completely loose of the board, the problem is back in the main power supply.


Let me know if you have questions and what you find as I am here to help you.


SD TECH

Posted on Apr 28, 2010

  • 2 more comments 
  • SD Tech
    SD Tech May 02, 2010

    Please consider unsoldering the two pins from the flyback to see if you get the b+ at the collector. If it is not there many secondary voltages do not come up and function.

    The 130 B+ has to be present. A set that is not producing High Voltage from the flyback may mean the transformer is bad. Most shops have a ringer to test the transformer out of circuit. The error codes and shutdown points can be misleading and the problem is more often the flyback or sometimes a open horizontal driver transformer.


    You got the 130 B+ or not?


    SD TECH


  • SD Tech
    SD Tech May 02, 2010

    I do not have a schematic of this model but yours should show where the 13 volts comes from. The term B+ refers to voltages from the power supply--you have the most critical one.

    You are sure the driver transformer is not open? You have carefully checked the board for bad connections or a possible crack?

    All this seems familiar to me and I wonder if we have talked here before about this set?

    9 out of ten times these sets have problems where the 130 volt is down, it will read higher with the set not working. If you have the 130 B+ with everything soldered back, it may be the high voltage transformer with a bad single winding inside it.

    If the voltage disappears when you solder the output and flyback back into the circuit, 99% plus chance the flyback is bad.

    Does all this make sense to you?

    SD TECH

  • SD Tech
    SD Tech May 02, 2010

    NO, if voltage is gone with flyback and output back in circuit next real possible part is the bad high voltage transformer.

    Give me exact model number of set and I will see if I can find online at a site that shows parts breakdowns for most sets the part number.

    SD TECH


    PS: I will be going offline here in about fifteen minutes for the evening and return at noon tomorrow California time.






  • SD Tech
    SD Tech May 02, 2010

    Part number is :







    1-453-268-21

    It is pricey from Sony at about 83 dollars but you may find a generic replacement on the internet for much less--I have done this with several of their sets.

    Search the part number carefully with GOOGLE and see what you can find.

    SD TECH


    Remember if you are satisfied to leave a "very helpful" rating so I get credit for helping you.

    I am going now and will see any further comments you make tomorrow.

    You are on the right path.

    SD TECH


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You can also try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..


If you are having some problems with your Sony Television, then this post is for you. Generally speaking, when there is trouble with your Sony Television set -- it indicates the issue in either the diagnostic mode, or even more commonly by flashing a series of LED blinks or flashes on the front of your television. Each set or frequency of the blinks indicates a very specific problem with the television itself. In some cases, you may be able to repair the television set yourself -- or in the worst case you may need to order parts, call a local repair shop to the have a repairman sent out, or even purchase a new television set.

First off, here are the list of codes and what they generally mean on my set (which applies to many recent model Sony Television sets. Sony has provided a "self-diagnosis function" with your TV, that in the case of abnormalities or problems the LED or red blinking light on the Timer/Standby indicator flashes a number of times to indicate the issue. Here are the values of the various blinks.

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* 4 times, Diagnosis: Vertical deflection stopped. Possible causes: +- 15V is not supplied. (D board), IC8003 is faulty. (A board) Symptoms of the problem: TV has entered standby state after horizontal raster, Vertical deflection pulse is stopped, Power line is shorted or power supply is stopped.
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If you would like to attempt a DIY, you will need a service manual to guide you. You can find one here:
http://servicemanuals.vstore.ca/

However, be aware that there are voltages inside your TV set that can kill, even if unplugged.



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