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Sony KV-27FS13 fell face down from stand onto floor, maybe 18 inches. No physical damage to case, buttons or any marks. Power on causes standby light to flash, but no picture. Unplugged power waited 10 minutes and re-powered up. Same symptoms. No picture or sound

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  • kfcbkmd Oct 06, 2008

    Which board is most likely to crack? How are are the traces to repair or what kinds of breakage on the board? Can you be more specific?

    What other kinds of damage might be caused?

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Hi,

How many times does this light(standby) blink, as there is a built in diagnostics for these Sony TV set.

The possible problem could be no reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.

how much electronic circuit training you have? and if you can use a schematic and know how these TV circuits work ?
You will need a mutimeter and a scope to trace the video.

The problem you have is on the M board or the U board, but a good going over, checking voltage will determine this .


Mostly the BLOWN FUSES will cause this problem that are positioned right next to each other on one of the boards. maybe from the M or U board, not sure.....

Kindly refer to any service center if you dont have enough training or knowledge in this area......

Thanx ....
Hope my info solves your problem.....


Posted on Oct 06, 2008

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The condition seems that there is a cracked/broken parts caused by shock

to troubleshoot:
try to open its back compartment,then check or inspect for the broken part inside
if its motherboard got a crack,try to fix it by soldering the broken line using jumper wire
how to solder: http://www.kpsec.freeuk.com/solder.htm
if there is a broken electrical component inside,desolder it and try to find exact value of the component from the electronic store near you. and then solder it.

Posted on Oct 06, 2008

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After a fell down the tv flashes the standby light and the picture is not coming so its the definate problem of powersupply board in the tv.but the tv was working properly before the fell down so it could also happen due to any of the parts getting loose inside due to fall down so its advisable to open the back side of the tv and check on the main board if something is got loosed or broken internally which will be easily visible as the part will be damaged there and you just have to replace that part.and also check the small glass tube which is called the fuse as if the fuse is broken inside the same problem can occur as u are having in your tv.the fuse is made of very thin glass so if could break due to fall down.it looks like a mini tubelight and its located on the main board.and if everything looks proper and fuse is just cracked you can just replace the fuse it will be very negligible to replace the fuse of the tv.
for the new fuse you can click this link and they will provide you
www.radioshack.com
just click the above link and tell them your proper model number of your tv and they will send you the fuse at your door step.

Posted on Oct 06, 2008

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Your circuit board is broken at the high voltage transformer. It is heavy and the board is thin. This where tv boards always break when they fall. If you can solder you can fix it. Run jumper wires to repair each individual broken line. Once it is repaired, though, the shadow mast inside the tube may have shifted and the color will be off. You can't tell until the set powers on and you get a picture. This is unrepairable.Good Luck!! Please rate this solution! Thankyou!

barneyluc

Posted on Oct 05, 2008

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Can you tell us how many times the stand by light flashes ?

It would give us a code to work with ...

thanks,

Posted on Oct 05, 2008

  • Karthik P Oct 05, 2008

    Seems it has to be fixed by Sony Service Center

    http://eservice.sony.com/webrma/web/inde...




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Try re-seating the lamp. If that doesn't work, check warranty status.

Even if there's no physical damage, a fall is a fall. Internals is what make it work.
Some fragile parts inside includes mirrors (each color has it's own set of mirrors).

Posted on Oct 05, 2008

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Here is a list of the problems that might have occurred indicated by the number of blinks. The words in parentheses are those, which you will see for each of these faults on a diagnosis screen described later in this article.

  • Unit is dead, No blinks - Problem in the standby power section. Might check fuse, R607, Q601, IC601, R612 and VDR601 (should show open).
  • Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.
  • One blink - not used for the self-diagnosis
  • Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
  • Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.
  • Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505
  • Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.
  • Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206.
  • Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
  • Eight GA_googleFillSlot("TL-IMU-Article");
    blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some projection models of Sony TV sets, this code means that T8005 (flyback transformer), or the associative components in the high voltage circuits are defective on the D board.

  • Nine blinks - Replace D 6116 and D 6301 on the "G" board, do not resolder as this will fix the problem temporary. Or Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing, then change the switching regulator on the "G" board or check connections. Make sure the regulator is -12 or -13 (negitive).
Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board.

Posted on Oct 05, 2008

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This model it is very easy to crack a circuit board from even a minor fall. Most likely this is what happened. If the crack isnt to bad it will be repairable for less than $150 if you find a good repairman. If the crack is worse it could be non-repairable.

Let me know what kind of information you are looking for so I can better assist you!

Thank,
Tim

Posted on Oct 05, 2008

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