Question about Sony KV-29FX30 29" TV

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TV cant be switch on, RED LED diagnostic Blinks .. 3 times... then 4 times. Please advise probable cause and send sTV hcematic diagram.

When power is switch on, the two green LED lights up but the screen remain blank .. after a few seconds, two green LED switch off and the red LED diagnostic blinks 3 times... then 4 times ... then continue blinking 4 times.

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  • prosant May 21, 2009

    Thanks Local wonder.. but I would like to correct ... model number is SONY KV29SF1. and this is the problem...." " " " " --> When power is switch on, the two green LED lights up but the screen remain blank .. after a few seconds, two green LED switch off and the red LED diagnostic lights up for 2 secs... then blinks 4 times .and continue blinking 4 times " . However, There are times that the TV will normally operate after switching on.. Suspect problem with Horizontal ckt - unable to generate horizontal sweep current to operate the CRT which is being sense by the microprocessor protective circuitry.? This is a guess... as I dont have ckt diagram .Please advise..

  • prosant May 21, 2009

    I studied Radio TV servicing but practice Control system engineering.. So I still understand quite well TV circuitry operation and can repair down to component leve -- given the correct information. l. I just need familiarity with the operation / function of the IC used in this KV29SF1 , service manual and ckt diagram will be very helpful. There is no Sony service center near our place so I have to fix the TV ..Will appreciate if anybody can e-mail me a copy of Schematic Diagram..

  • Anonymous Mar 17, 2014

    LED blink and no power and i need circuit diagram. my email address is stewardmoli@gmail.com

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  • Master
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Hi, this is main board failure and you will need to replace this vital board. you power board is fine but, it is unable to send a proper current through the main mother board due to the damage at hand.

Posted on May 21, 2009

  • Michael Masters
    Michael Masters May 21, 2009

    Ckt is probable but, this component may be discontinued. i will do some further research on this a and return within the hour. this could be a faulty CRt tube as well. i will resarch this further...

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Sony TV set, KV20FS120 BA6 chassis: light blinks, set isn't coming on. Why?


Sony sets like this have a built-in self-diagnostic function.
The blinks of the Standby LED are the self-diagnostic codes.
There may be more than one error. The blinks indicate only the first error.

Unlug the set. Wait 30 seconds.
Prepare to count the number of times the Standby LED blinks.
Plug the set back in. Count the blinks.

2 blinks
  • Diagnostic Item Description: +B overcurrent (OCP)
  • Probable cause:
    • H.OUT (Q506) is shorted. (A Board) (20"/21" models only)
    • RGB Amp (IC1751) is shorted. (CV Board)
  • Detected Symptoms:
    • Power does not come on.
    • Load on power line is shorted.
4 blinks
  • Diagnostic Item Description: I-Prot
  • Probable cause:
    • +13V is not supplied. (A Board)
    • IC545 is faulty. (A Board)
  • Detected Symptoms:
    • Has entered standby state after horizontal raster.
    • Vertical deflection pulse is stopped.
    • Power line is shorted or power supply is stopped
5 Blinks
  • Diagnostic Item Description: IK (AKB)
  • Probable cause:
    • Video OUT (IC545) is faulty. (A Board)
    • IC001 is faulty. (A Board)
    • Screen (G2) is improperly adjusted.
  • Detected Symptoms:
    • No raster is generated.
    • CRT Cathode current detection reference pulse output is small.

The above may be of little help. Your best bet is to download the service manual for the KV20FS120.

...Google search: Sony KV20FS120 service manual

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1 Answer

I have 3 flashing red lights when I try to power up my TV.


Over Voltage Protection . this is the cause for 3 blinks you see by its stanby/power LED.


Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1000 posts to different brand TVs now. Pull up older posts there.

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Bought in Dubai 3 years ago Pan.Viera LCD 32"\r\nStandby light flashing red/green. Have to switch on with on/off button after a few minutes switches off itself..........then back on itself


Power LED Blinking timing chart
When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
blinking

1 dg board, (stv 5v sense time out)
2 d board
3 d board
4 p board
5 d board
6 su sd sc boards
7 su sd sc boards
8 ss board
9 panel config
10 digi board-
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12 h board
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Tom Miller
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1 Answer

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