Question about Sony KV-35S42 35" TV

2 Answers

Problem: After depressing the Power "on" pushbutton, the Stand By/Timer pilot light flashes but the set (Picture Tube) does not turn on. Cause of problem: After a power outage I plugged my entertainment center (including TV) into a portable generator. The TV operated at first but after starting the separate devices, I noticed smoke emmitting from the DVD/VCR combo unit. I immediately shut everything down. Once utility power was restored, the DVD/VCR combo unit and the TV would not turn on. The other devices were unaffected. I suspect the cause to be related to a low voltage condition rather than a spike. Analysis: After removing the back of the TV and unplugging and removing the power circuit board I could not find any unusual or abnormal condition...I using a meter the fuse checked OK. What should I be checking next?

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  • 3 more comments 
  • hollowhead1 May 08, 2010

    I've removed the power board and need help trying trying to identify the location and quantity of capacitors that need replacement. Should I take a photo and email it to you?

  • hollowhead1 May 08, 2010

    I'm not working on the combo unit as of yet. Regarding the TV power board, the power source is ok. good power coming into the board. I'm still trying to determine which components are capacitors. There are three (3) components that look uniformly "bulged" but I cannot discern whether they are capacitors or if they are "bulged" witout a comparative component. I went to two Radio Shack stores and nobody (not even the managers) could identify the suspected components as capacitors or not.



    Description:

    All three suspected (bad) capacitors are turquoise, and look like an overstuffed suitcase measuring 1/2" tall and 3/4" wide and 3/16" thick with two leads protruding out and soldered to the board. None of the suspected capacitors have any indication of overheating. All of them are marked with the SA logo followed by 2B224M. I cannot find a micro farad value.

  • hollowhead1 May 08, 2010

    Sorry, it's a Sony KV-35S42 serial # 9060205

  • hollowhead1 May 08, 2010

    After re-assemblying the set, I plugged it in and the standby/timer indicating light began cycling off and on as usual. I tried to reset using the remote control by pressing display, but couldn't find a "channel" button. I pressed "5", then "volume plus", then "power", then "8" and then "enter". No Luck. I repeated this sequence numerous times beginng with the set on (standby/timer light flashing) and then with the set off. Please keep in mind the picture tube never illuminated so I cannot view anything displayed.



    Unless there is another way or sequence to reset, it's probably a more serious issue requiring replacement. i just hate to give up on troubleshooting.

  • hollowhead1 May 09, 2010

    Thank you for your expert advice. Yes, you are so correct that the root cause must be determined only after performing proper troubleshooting measures. Part of that process is a service manual and schematics (which is only the first step). Presently, I've chosen the option to contact an Authorized Sony Service Center for a repair quote. Normally, I'd view my approach as a failure to meet the challenge of personally solving the repair task, but your detailed explanation (listing the complexities involved), expedited my decision. I'm now confident this approach will cut my time losses. Again, thank you for chiming in and providing guidance that I'm sure will also save money and further headaches.

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2 Answers

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  • Sony Master
  • 12,061 Answers

Http://www.eserviceinfo.com/index.php?what=search2&searchstring=KV-35S35+ch.AA-2D
http://www.givemefile.net/smanuals/tv/sony/file/8230.html
Above are two service manuals, download BOTH and use them to sort out your problem if you can.
The Power supply, always start at that... Anyway please use this Service manual above, inside are all the troubleshooting and repair guides, circuit diagrams instructions the lot. &, well I applaud you for wanting to have a go and try to repair you set. But PLEASE, start in the right place, otherwise you will simply waste your time and money, You see, you MUST start, in the right place, The power supply, FIRST, as, if, that isn't right, nothing else can be. But you simply cannot do anything without a Service Manual. In this it has everything one needs to repair the set. OK if it is shutting down, after that amount of time, of working and then faulting, then it is most definitely a "Thermal" problem, the way we "Find" problems such as this is "Freeze Spray" you use this on each component that is suspected of being the "Culprit" and you will soon,find that errant component. Now, also not every fault is a Capacitor, I see many, many people that think, that Capacitors are always the "Culprit" and replace them, because someone else had done so and it worked, well that maybe sometimes true, but most Symptoms, can, and do have many, many different "Causes" & also, now while that may be true in a few cases, a faulty Electrolytic Cap, or even, ordinary, Cap goes faulty, this is only a SYMPTOM, something has damaged those caps causing them to "Fail". One MUST always find the root "Cause", otherwise if you just treat, the SYMPTOM, the "Cause" will just make the "Symptom" come back, in short order, as the prime cause still, hasn't been fixed., Now Capacitors hate AC ripple, or Over Voltage. Thats it. Oh.. and Heat, if these Capacitors, are too close to a Heat Source, then thats a prime cause of failure. Resistors, hardly ever go faulty,and if they do, it is generally obvious. However it doesn't hurt to check values with our Multimeter. Remember though resistors are made, with up to 20% tolerance from stated value, as such, are not too critical, unless in Timing circuits etc. Always check, the Values, of resistors, as with any other component, with the power OFF. Now Diodes especially "Zener Diode", are another thing to check, those and ordinary "Signal Diode" should always be suspect. next we have Transistors and IC's. The Transistors MUST ALL be checked to see if they have a good, "Junction" this is done, with our meter set to "Diode Test" and usually are about 0.6 to 0.7. With IC's you must check, voltage levels, or Logic Levels, going in and out, have a look at the circuit diagram, and it will tell you what they should be. It is a good idea to always measure the Power Supply voltages, see if a "Rail" is Low, that will be because some component has gone somewhat or all short circuit, to Earth, now, if the "Rail" is Higher, suspect an "Open Circuit" component, like a Diode, or Transistor. The voltages expressed in the manual are spot on, ANY variation MUST be investigated. I have been doing all this for over 30 years now, and I do indeed wish, we could have a set of "Symptoms" and be ables to say.. "Oh that;s the so-in-so and replace this" however unfortunately this although does happen, most "Symptoms" can have literally tens, of "Causes" all often "Interlinked" One simply has to do a methodical troubleshooting procedure, and always think, "are my Voltages Correct" as this is how, you Fix the problem, by making them so. Keep up the good work. If that link above doesn't furnish a Service manual, it is imperative you get one, even if you must pay for it. It will pay for itself in about 2 mins.
it is nearly always my professional opinion that one should always get a "Quote" from the manufacturers recommended service center, SONY, in your case, contact a local or head office, and ask for a referral to an Authorised service center, I cannot stress how important that last point is. It is even worth the cost of shipping. you see an authorised service agent, will have trained staff, trained on their brand, also they have first hand access to parts, original parts. This will actually save you money and ensure you can actually get it back fixed. Of course asking for a "Quote" also gives on the option of repair or replace. Often my clients,do not go through with repair, unless it is moderate, but in some of the more costly jobs they see it, as do i, that a replacement, with a warranty, is a better option. As an aside here, one could then tear the TV down, and sell the Known Good bits. You'd be surprised who needs parts, i myself often must by from third party sources to effect a repair. So money could be recouped, somewhat,and help out someone else.

Posted on May 09, 2010

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  • Master
  • 8,619 Answers

Hi


Thanks for using FixYa. Please use a different power socket for both the TV and the combo. Also please check both the units one by one whether these are working properly or not. It also seems that the issue is with the power board or the main board and we’ll need to check few things. When you open the unit up; take a look at the power board-the board where the power cords/plugs goes into. You might see some filter capacitors a little bulged up in the top-If this is the case-this is your defective part(you can try to replace them-but some soldering equipment is needed). If not, then probably the main board has gone bad. This is the other board-where all the inputs are going into. All this is only recommended if you have electrical expertise and know how to solder/re-solder components. Please note that the TV components consists high voltages even when in off position. Please do accept the solution if the issue is resolved or post a comment for further assistance.



Thanks
Rylee

Posted on May 08, 2010

  • 1 more comment 
  • Rylee Smith
    Rylee Smith May 08, 2010

    Have you tried a different
    power socket for both the TV and the combo? There is no need to send the photo. Just check
    the two boards – one where power
    cords/plugs goes into and the other board-where all the inputs are going into. The
    capacitors which look somewhat popped or bulged on the top and are looking different from the others are gone bad and
    required to be replaced.
    Please do accept the solution if the issue is
    resolved or post a comment for further assistance.









    Thanks


    Rylee



  • Rylee Smith
    Rylee Smith May 08, 2010

    I think
    there is some misunderstanding as you have not provided the make and model #. Please
    let me know it first to arrive at any conclusion.









    Thanks


    Rylee



  • Rylee Smith
    Rylee Smith May 08, 2010

    Ok. No
    need to be sorry as this was my fault as well. Please re-assemble the TV set
    and reset the TV by
    going into the service mode by pressing display->channel
    -> 5 ->volume plus -> power and then press 8 and Enter.
    If still the issue is not resolved
    then it seems that the main microprocessor video jungle IC is not working. This
    happens when the IC data lines appear busy and the bad IC is not letting it to
    boot up. This is a pretty tough repair because identifying the fault location
    is not easy. Replacing jungle IC won't help either if the bad components or
    cold solders are not corrected. You should also require multimeter and
    soldering equipments. However, this set is old enough as it is not displaying
    the newest trouble codes.
    You can order the par(s) online from
    the links---






    Sony Parts





    Part
    Store.Com





    However, I will suggest that this set has served well and the symptoms you
    listed are always serious and you should anticipate that any repair will not
    only be costly but may be followed soon thereafter with another failure as this
    set is ancient enough to be worthy of a replacement.
    Please
    do accept the solution if the issue is resolved or post a comment for further
    assistance.









    Thanks


    Rylee



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