Question about Standard (CRT) Televisions

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Dead set, on standby mode only

DEAD SET, NO RASTER, ON STANDBY ONLY

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  • ed2008 Jul 29, 2008

    DAEWOO DTQ-20V4N DEAD SET, ON STANDBY MODE ONLY

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  • 623 Answers

You might have a burnt transformer,take it to a tv repairman or buy a new tv set

Posted on Jul 29, 2008

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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 Standard (CRT) Televisions

1 Answer

Why my sony TV ES29M80 switching to standby mode immediately?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Sep 04, 2014 | Standard (CRT) Televisions

1 Answer

WHEN SWITCHING ON MY PANA CRT TV IT MAKES A SOUND LIKE A SQUEEK 7 OR A TIMES AND GOES BACK TO STANDBY


There is short circuited component/s at its horizontal scan output stage circuit. Check the horizontal output transistor first. Check it for collector to emitter, or collector to base, leak. Replace it with the same numebr, and check. If it do not help you, check and replace the Line Output Transformer [LOT]. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.

Jan 01, 2014 | Panasonic Standard (CRT) Televisions

1 Answer

My sony kv-ef3491 Has entered standby state after horizontal raster


If set does not make it on then the light on the front blinks for example--count the number of blinks before a pause----Horizontal line left to right?

Oct 31, 2012 | Standard (CRT) Televisions

2 Answers

Can't change channels, volume, or power off or on


You need a new frount control raster for this TV, what has happend is this little circuit board under the buttons has given out. You might have lost the function to control with the remote as well. The best thing to do here is take it to a tv repair shop. and have it looked at.

Diagnosis: bad control raster
Prognosis: replace raster with spare or new

Do not shoot the messenger please do leave postive feedback and ratings today.

Jun 14, 2010 | Toshiba 32A33 32" TV

1 Answer

Retrace green, relay on/off..when turn on the screen is green and after a few seconds it turns off by itself


Oh dear ! I fear my answer may not be what you want hear but my advise is free. Bright green raster with Flyback (retrace) lines may indicate a heater cathode short in the tube (crt) this causes a sharp increase in beam current and the power supply shuts down into standby mode. To prove the point isolate the red and green cathode pins on the tube base and cross couple the red video output stage to the green cathode pin and the green output to red cathode pin using wire links. If set now comes on with bright red raster the fault is in the green video output stage and not the tube. If still bright green then tube is most likely cause. Gently tapping the tube neck may prove the point, but take care the tube neck is thin glass and if hit too hard will break compounding your problems. WARNING if you do not feel totaly confident to attempt this level of repair there is no shame in seeking the advice of your local service technician. Safety first always

Mar 04, 2010 | Sanyo 21MT4 21" TV

1 Answer

SONY TV PICTURE TURN GREEN WITHOUT RETRACE


Picture goes to high green with retrace lines that shows picture tube is defective and requires replacement.
Usually in above symptom, TV goes to standby mode and standby light blinks when green raster problem occurred.
New TV is better option because picture tube of KV-34XBR960 would not be available any more.
Thanks.

Aug 14, 2009 | Sony Standard (CRT) Televisions

1 Answer

TV dead; unresponsive, no raster, nothing.


You may have lost the standby power supply. There should be a 5v supply that runs with the set in standby, see if you can find that. Also check for B+ (around 160VDC) at the large filter capacitors in the power supply.

Oct 06, 2008 | Toshiba 36A60 36" TV

2 Answers

Dead Set


No power, no sound. your tv is gona be dead set problem when they have no standby mode or standby ligth. need a repairman tech.

Apr 10, 2008 | Samsung CW29M64NS 29" TV

1 Answer

Circuit board was damaged in electrical storm. Replaced with new board. Now, screen comes on full raster, but with retrace lines. Picture is very faded and barely visible behind lines. Sound is OK and...


I am unable to find in your statement about which brand or type of motherboard is used. One thing i come to know your using service mode kit. knowing in your statement your are a technical person. My simple idea is first you set the TV in standby mode using remote. Then in FBT reduce the screen control minimum position, the release standby. Now the tv is oscillated, now slightly increase screen control till get maximum video and zero retrace line set in position. Even no improvement give me clear picture of brand and microprocessor ic etc. there is a chances to solve by having the above details.

Aug 27, 2006 | Sanyo DS31520 31" TV

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