Question about Sony KV-32FS12 32" TV

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TV won't turn on

I picked up this TV from someone who didn't want to spend the $$$ to fix it. A repairman told him it was likely a bad step-up transformer. After the initial click when the TV is turned on, I hear 4 or 5 more clicks and then nothing. Sounds like something is repeatedly trying to start up but can't get going. If I can get help troubleshooting this & I'd like to repair it myself. Thanks so much! Bob

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  • Bob61E May 30, 2008

    Welcomejee - Thanks for responding so quickly to my post. I'm a definite do-it-yourselfer and believe I'm knowledgeable enough to avoid frying myself. That being said, if you recommend that only a true TV tech work on such a set, I'll probably get rid of the TV.



    Anyhow, in response to your question, the stand-by light blinks in the following pattern when the set is turned on (an "L" means a long blink, "S" means a short blink & a space means a pause between sets of blinks):



    LSS LSL SL SL (SL continues to repeat)



    Any suggestions or further questions you have based on the above are most appreciated! Bob

  • Bob61E May 30, 2008

    Thanks again Welcomejee! I have a multimeter for testing purposes & I should be able to locate the components you've referenced. Can you tell me how to test the components to see if they're bad?



    Bob

  • Bob61E May 31, 2008

    Welcomejee - Thanks for the detailed instructions. I tested the Hor. Output transistor Q502 on the A board & found no resistance in the base-collector contact. There was some resistance in the base-emmiter contact. Sounds like I should replace this transistor? Would you recommend any other testing or parts replacements while I'm making this repair? I can't thank you enough for your suggestions.

    Bob

  • Bob61E May 31, 2008

    Welcomejee - One more thing. I tested the Q502 transistor while it was still soldered in the circuit board. Does this transistor need to be removed for proper testing? Thanks, Bob

  • Bob61E Jun 02, 2008

    Welcomejee - Thanks for the further guidance. I'll take the transistor off of the board & re-test it. Unfortunately, I'll be unable to do that this week. I'll post my findings in a week or so & if you're still able to help that would be most appreciated. Take care,

    Bob

  • Bob61E Jun 16, 2008

    Welcomejee - I hope you're well. I finally got back in town & removed the Q502 HOT for testing. I found no resistance between the Base-Collector contacts. I found some resistance between the Base-Emitter contacts. Based on your previous guidance, sounds like the HOT needs replacing, but should I test anything else? Also, the HOT is labeled "D2580" but when I looked for parts online, I could only find a transistor number "2D2580" are these compatible, or can you direct me to a good website for buying parts?



    Thanks so mcuh for your help!

    Bob

  • steli steel Apr 15, 2009

    HI! I have same identical problem.After the initial click when the TV is turned on, I hear 4 or 5 more clicks and then nothing. Sounds like something(relley) is repeatedly trying to start up but can't get going.,the only different it is that ,will blink 4 times-pause-4 times-pause and so on. If I can get help troubleshooting this & I'd like to repair it myself. Thanks so much!

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Hello Bob61E,
life safty should be 1st priorty before opening of TV set ;)
if you are skilled or qualifeid, then go-ahead and
if its Sony TV, you will see stand-by light blinking while tv try to power up. let me know how many time this light blinks.

Posted on May 28, 2008

  • 1 more comment 
  • Shahid Electronics
    Shahid Electronics May 30, 2008

    Alright, 2 times blinks shows that its "Horizontal Output Transistor Q502" on A board or "IC702" on CA board could be defective.

    Please check n let me know out come.

  • Shahid Electronics
    Shahid Electronics May 30, 2008

    well, you can test Transistor by multimeter but cant test IC. Transistor has 3 pins named Base-Collector and Emmiter. Please select Resistance Measure X1 range at multimeter and touch both black-red probes to confirm needel movement. now put black probe on Base terminal of transistor and touch red probe to Collector. watch the screen og multi meter, it will show you some resistance, means good. now touch red probe to Emmiter pin of transistor and confirm same resistance value as it was on Collector. Transistor is in good condition. This is test procedure for general purpose NPN transistor. Now come to H-Out transistor Q502 in your tv. its base-collector contact will show resistance but base-emmiter will show very less resistance. hope this info will be useful.

  • Shahid Electronics
    Shahid Electronics Jun 01, 2008

    Hi Bob,

    Transistor should be out of board to test properly. If its found short, replace it pls.

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