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

Apr 26, 2016 | Sony Televison & Video

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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2 Answers

Sony Triniton TV KV 32FS120 will not turn on


In standby mode (red led on/after the led stops from blinking), press "Display", "5", Volume (-)", "Power on" on the remote control in sequence, self diagnostic screen will be display, let me know the what is on the screen to diagnose where the fault came from.

Nov 25, 2011 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

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-
11 pb board
12 h board
13 dg board

Tom Miller
Broadcast Eng

Mar 04, 2011 | Panasonic VIERA TX-32LXD80 32 in. HD-Ready...

1 Answer

Whitch one part of the ''WANSA'' TV? STV3325 OR STV 9325


My TV produces an buzzer sound when I switch on. The TV is WANSA TV. Can U advise how to resolve it.

Jun 10, 2009 | Daewoo Televison & Video

1 Answer

The power light keeps blinking and it doesnt matter if i unplug the tv and plug it back in when i go to turn it back on it just blinks.


the blinking power light is actually a diagnostic of a faulty part inside the set.

Here is the diagnostic info and which part you need to replace.

1 blink STV 5v sense DG Board

2 blinks 15v SOS D Board

3 blinks 3.3v SOS D Board

4 blinks Power SOS P Board

5 blinks 5v SOS D Board

6 blinks Driver SOS 1 SU / SD / SC Boards
(SC energy recovery circuit)

7 blinks Driver SOS 2 SU / SD / SS Boards
(SC floating voltage area)

8 blinks Driver SOS 3 SS Board
(SS energy recovery circuit)

9 blinks Panel Config. SOS

10 blinks Sub 5v SOS / Main 3v SOS DG Board
DTV 9v SOS / Tuner Power SOS

11 blinks Fan SOS PB Board

12 blinks Sound SOS H Board

13 blinks Communication error DG Board
with IC8001 (Pesks Lite 2)

if this set is still unedr warranty, please use the warranty to replace the part. Else, have a professional install the new part for your safety.

hope this helps.

regards,

voodoo

Jun 09, 2009 | Panasonic Viera TH-50PZ85U Plasma TV

1 Answer

Sony wega kdsr60xbr1 blinks red 4 times


Probably the power supply is failing

Dec 21, 2017 | Sony Televison & Video

1 Answer

Tv wont turn


The blinking red light at the the front of the television is the "Diagnostic STANDBY/TIMER LED".
This little red light will blink 2, 4, or 5 times and then stay off for three-seconds. And blink again for 2, 4, or 5 times. This cycle repeats. The most common diagnostic code is the 4-blink code.

When the red LED blinks 4-times, it means one of two possible causes:
1) +13V is not supplied on the A-board. Or, 2) IC502 is faulty.

It is best to take this television set to a repair facility and ask that the +13V power supply be repaired.
The copper tracks and integrated circuit pads are very thin and delicate on the KV-24FV12 circuit board, and will easily lift off of the circuit board, if the incorrect desoldering tool is used. Unless one has a good quality PACE vacuum desoldering unit, one should not attempt to repair the television.

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1 Answer

Power LED blinks red


it is a bad fan. it also could be a power supply. Quite often the real problem is dirt clogging up the fan(s) to the point that they need to be replaced. Operation of the set in a dirty environment is not a good idea

Feb 26, 2008 | Sony KDS-60A2000 60" HDTV

1 Answer

Kv24fs120 dead set with two led blinks


Two-blinks of the "Diagnostic STANDBY/TIMER LED" indicates one of two things:

1) Horizontal Output (Q502) in shorted on the A-board.

or

2) IC702 is shorted (CB board)

Two-blinks of the diagnostic red LED is a " B+ Overcurrent" problem.
The red LED will blink 2-times, stay off for 3 seconds, then blink 2-times. The cycle repeats.

The circuit board is quite delicate. One should not attempt repairs (unless one has high quality vacuum desoldering equipment such as a PACE desoldering unit).

Feb 01, 2008 | Sony KV-24FV12 24" TV

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