Question about Sony KV-35S45 35" TV

3 Answers

I do have Sony KV-35S45 TV. I had before problems with blinking light and no vertical picture. Replaced 2SC5148 Hout transistor and it worked fine for 10 weeks. I think after I put back cover it got warm and failed again. I replaced 2SC5148 again but now it clicks and clicks only no standby light or any lights. So now after Power on I hear click and click and click....on T621 relay on G board which is Power supply. What I can check to fix it? Thank you Andrew

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  • 11 more comments 
  • andrewlacki Mar 25, 2011

    How to locate diode? Is it on main A board where I did replace Q502 H-out? I can see D502, D503, D504 but do not see R2KS/R2KN. What is closest large component to diode? How to check for open resistor at the power supply?

  • andrewlacki Mar 26, 2011

    After I locate diode how do I check ou if it is good? Can I take it out of circuit and check with ohms meter? If one way about 10Ohms ??? and the other way 100K ??? then it is OK? If both ways about 10Ohms then it is no good. What is the part number for me to order? Do I order from sony or you know better Websites? Thank you. Andrew

  • andrewlacki Mar 26, 2011

    How to locate diode? What is label on the main A board where I did replace Q502 H-out? I can see labels D502, D503, D504 but do not see R2KS/R2KN. What is closest large component to diode on main board A? Is R2KS part number to order diode or label on printed circuit main board A?. Does it mean that there is second diode R2KN which I also have to check located at Power Supply board G which has fuse? I can see labels D645, D648 but do not see R2KS/R2KN. What is closest large component to diode on Power Supply board G? How many diodes I need to check? How to check for open resistor at the power supply? Which resistors to check R615 R612.....?

    How to locate diode? What is label on the main A board where I did replace Q502 H-out? I can see labels D502, D503, D504 but do not see R2KS/R2KN. What is closest large component to diode on main board A? Is R2KS part number to order diode or label on printed circuit main board A?. Does it mean that there is second diode R2KN which I also have to check located at Power Supply board G which has fuse? I can see labels D645, D648 but do not see R2KS/R2KN. What is closest large component to diode on Power Supply board G? How many diodes I need to check? How to check for open resistor at the power supply? Which resistors to check R615 R612.....?

  • andrewlacki Mar 27, 2011

    Let me follow up with you. Are you capable of solving the problem? Are you able to locate diode? Are you reseaching the problem? Last time I have heard from you was one day ago. I expect within next 3 hours to respond to me if you need more time. Thank you. Andrew.

  • andrewlacki Mar 27, 2011

    Main board A is AA-2D 98. Power Supply board G is A 1316-399A. Why it is burning my Q502 H OUT 2SC5148 transistor? What I need to check to fix current symptom to constantly clicking T621 relay located at Power Supply board G? When I disconnect power, unplug connector going between Power Supply and Main board A then power on - relay stops clicking. I think something is wrong on main borad causing clicking. Please let me know what to check to pinpoint it to the bad component.
    Thank you. Andrew.

  • andrewlacki Mar 29, 2011

    I did look at capacitors and they look OK. When I have connected only Power Supply board then I relay is not clicking. As soon as I connect main board A as a load to Power Supply then it clicks and clicks. How to find out what is the root cause for clicking?

  • andrewlacki Mar 29, 2011

    Does it mean that I need to measure diode in the circuit and if have 10Ohms both ways then take it out of the cicuit and measure again. If then has 10Ohms both ways then it is no good.
    How to locate which diode to check?

  • andrewlacki Mar 29, 2011

    I have schematics for my model. On main board A there is IC001 Tunning MCON which has line labeled Relay. What is triggering that line? Is some voltage missing? Is it something else? When does it go to protect mode?

  • andrewlacki Mar 29, 2011

    How to find out what is the root cause for relay clicking? How to find out which diode to check? How to schematics with voltage pictures at specified testing points?

  • andrewlacki Mar 30, 2011

    How to find out what is the root cause for relay clicking? I have schematics and oscilloscope. Do you know about description of Power Supply on the Web which I can use to troubleshoot the problem?

  • andrewlacki Mar 31, 2011

    I have PIN 1 changing from about +2.1V to -1.8V, Same for Pin 5 and 7. Pin 10 is changing from +6.0 to +2.0V. It looks to me like I am missing 9V on Pin 5. What you think is the next step?

  • andrewlacki Apr 08, 2011

    Let me follow up with you. When I was checking output voltage of pin #1, pin#5, pin#7 and pin#10 of CN641 connectors(G-board) I did shorted two pins. This has blown fuse 6.3 Amp.I think that may be has damaged an additional component. Taking all into consideration I decided to stop trying to fix TV and buy new one instead. I do appreciate you plan and step by step professional instructions. As soon as you reply back to me I will close the problem giving you full credit for it. Thank you. Andrew.

  • andrewlacki Apr 08, 2011

    Technician was very professional. Thank you.

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3 Answers

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  • Sony Master
  • 2,098 Answers

Hi Andrew,
Check output voltage of pin #1, pin#5, pin#7 and pin#10 of CN641 connectors(G-board). These are DC voltages.
Let me know the reading to assist you further
Jdvillanueva

Posted on Mar 30, 2011

  • Jdvillanueva
    Jdvillanueva Apr 01, 2011

    You have an abnormal voltages reading in that board. Pull-out this G-board and make first some re-soldering to isolate bad solder joints from fault. Look for crack/dried/cold solder in that board, this is hard to spot, I would advice you to work in the brightest area or used table/portable lamp and magnifying glass. After that test again the pin-out voltages, if nothing changed, check the voltage across the largest cap C607(250v/560uf).



    - Stay the black test prod of you meter to ground of this cap then jump the red test prod to pin#2 of chopper transformer T605.



    - Set you meter to AC, check the AC voltages in pin# 10 and pin#11 (black test prod to pin#10 and red test prod to pin#11 or vise versa.



    Let me know the reading to determine the next steps.



    Note : ensure safety precaution while in testing of voltages to avoid electric shocked or further damaged.



    If you can send me the closer picture of the board (Top view and on the conductor side which I can read the labeled parts) much better.

  • Jdvillanueva
    Jdvillanueva Apr 08, 2011

    Hmmm, this how difficult working in the power supply section, a little mistake will result to additional damaged. Safety precaution is a must, however we will learn to our mistakes and that cenario also happened to me when I was starting in electronics troubleshooting. This is the real world of electronics...



    Good luck bro, and have a nice day!

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  • Master
  • 1,591 Answers

You're most likely right about it being the power supply section.
]The thing I am seeing most these days is failing electrolytic capacitors.
Look for any that are even a little bulged on top or worse, bulged and or leaking on the top or bottom.
This may be what took out your transistor before, or the failing transistor may have damaged one of the capacitors.
The caps I see going most nowadays are rated 10V 1000uF or 3300uF, but it hasn't been limited to these exclusively.

Give a check to the inverter boards too though, in case the power supply is going into protect (the click you hear) as soon as it tries to turn on the backlights.

Don't forget to check to be sure all the cables are well connected when reassembling the unit!

Posted on Mar 27, 2011

  • 2 more comments 
  • Norman Skinner
    Norman Skinner Mar 29, 2011

    If resistance both ways is 10 ohms, take the diode out of the circuit and re-test it.
    If a transistor is firing a coil, the transistor will have the coil's resistance across the emitter and collector (plus any resistance from series resistors)....you have to take a component that LOOKS bad out of the circuit to properly test it!

  • Norman Skinner
    Norman Skinner Mar 29, 2011

    A diode out of circuit should have much more resistance in one direction than the other.

  • Norman Skinner
    Norman Skinner Mar 29, 2011

    if you're going to diagnose over the net you should have a schematic, and i don't have one for your unit, and youj don't have one, so I am done here.

  • Norman Skinner
    Norman Skinner Mar 30, 2011

    At some point you have to determine if you can diagnose to a component level. If you can't, then replace the bad board completely. I can guide you to the solution but I can't completely teach you electronics in the process. It took me years to learn electronics, and I just cannot teach someone electronics in one chat session. Stop looking for components and replace the board.

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  • Master
  • 1,961 Answers

Check the zener diode on the horizontal section this diode is a circuit protector it became shorted once an over voltage occur it is labeled R2KS/R2KN replace it with a new one...check also for an open resistor at the power supply section good luck let me know..

Posted on Mar 25, 2011

  • Danilo Baraquiel
    Danilo Baraquiel Mar 26, 2011

    hold on sir! I'll be preparing a visual reference so you could easily find the diode in your circuit diagram.

  • Danilo Baraquiel
    Danilo Baraquiel Mar 26, 2011

    zener diode is located at the main board just within the high voltage section at the Horizontal output area and on the power supply board.Zener diode is a voltage limiter diode it is measured with a multimeter set your multimeter into a diode test because a diode has a polarity the reading from the multimeter must not have a reverse reading.when you measure it in forward bias the meter must have a reading and for reverse bias the meter must read 0000 no reading the diode is good.here is a link for a diode tutorial

    r2ks diode application circuit...

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