Question about Sony KP-65WV700 65" Rear Projection HDTV

2 Answers

Hello my sony kp-65wv700 tv will turn on for just a few second then it turns off. Then would not come on for at least a few minutes. Thanks Mark 770-318-9925

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  • dorry707 Sep 14, 2010

    I have a Sony kp65wv700 turns on and then comes off immediately, prior to this there was a green line across the tv when watching even after it was turn off almost a wave line (rainbow ), I just notice now that it would not even come on now.

    Mark
    770-318-9925

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2 Answers

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  • Sony Master
  • 5,807 Answers

Hi,


Here are some


Troubleshooting Tip:

if a failure occurs in the 5V Standby Power Supply the unit will

not even attempt to turn ON.

If this condition occurs,

check the following components:

1) FH501

2) 13V at IC501 Input Pin (I).

If missing, suspect T502, D503 and/or C507.

3) 5V at IC501 Output Pin (O).

If missing, suspect a defective IC501.

4) NOTE: Q503 is used as a current source for the AC relay

(RY6501).

If the collector/emitter junction of

Q503 becomes an Open circuit,

the set will still turn ON (using voltage through D509) and

function properly with sufficient AC power input.


If the AC power input is weak (Low Voltage ~90VAC, the unit

will have difficulty turning ON

without Q503 functioning properly.


5 ) If the 200V line on the CRT Board equals the voltage

value of the Power Supply (135V ) then your Flyback

is not oscillating

Posted on Sep 14, 2010

  • 4 more comments 
  • Rommel Cana
    Rommel Cana Sep 15, 2010



    Could the green line be slanted upward to the right or just plainly

    a horizontal line?


    Whichever the case, you might need to hang freely the CRT Board

    to determine if power tries to go on, and not turning Off


    while troubleshooting

    the unit

  • Rommel Cana
    Rommel Cana Sep 15, 2010



    You should also be having a sound , even all the

    CRT Boards are hanging , only if there

    are 200V on the 200V line.

  • Rommel Cana
    Rommel Cana Sep 15, 2010




    sample image of a CRT Boards:


  • Rommel Cana
    Rommel Cana Sep 15, 2010



    Hanging meaning Unconnected to the CRT s

  • Rommel Cana
    Rommel Cana Sep 15, 2010



    If you can hear sound ( with a source connected like Ant or AV In )

    on your speakers,


    then you just have troubleshooted a large percentage on

    electronic troubleshooting.

  • Rommel Cana
    Rommel Cana Sep 15, 2010





    • And when it is hanging you can probe your Multimeter




    How to use a multimeter






    here ( 200V line )



    sample image on Red CRT Board:

×

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  • Sony Master
  • 11,800 Answers

You have a faulty part either in the power source or the high tension module. To identify the faulty part the tv must be opened and tested - this is a job for someone qualified in that, so call a repairman, there's nothing more you can do.

Posted on Sep 14, 2010

  • Azrael SRL Sep 14, 2010

    A green line is caused by the fact that the green tube in no longer suppressed when shut down -and later this has spread to all 3 tubes. This is a major malfunction in the high tension and the final video boards - the ones that power and control the tubes (the power source is probably just fine, it was shutting itself down to protect against the overload caused by the failed parts). Start checking the voltages at the tubes especially the G2 one - and that of the cathodes.

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1 Answer

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You may very well have issues with capacitors on this set being that it is or very similar to the V26 chassis. Since I have spare test lamps laying around, I would normally try that first. If the lamp still would not stay lit, I would then suspect the electrical chassis (capacitors). When I suspect the chassis, I can usually verify it by pulling it out and partially disassemble it and find blown capacitors

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