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Pnasonic color tv model tc-21sf2 it has no picture and no sound but it has a good high voltage output

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A missing voltage either in the power supply or one of the secondary voltages that come from the High Voltage area.

Posted on Dec 03, 2012

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Posted on Jan 02, 2017

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SOURCE: Pictures shrinks.. Panasonic TC-20LM Television

Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.

Posted on Oct 10, 2009

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SOURCE: Panasonic TV 4 System CATV Hyper-Band TC-20S10M

i want alternet nomber of the if L019

Posted on Sep 26, 2010

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UndefinedI've checked a Panasonic crt color tv model TC-21fj20p, and I find a hard way to discover the cause of the problem until now.. The set has a good primary voltage supply. No problem with the IC...


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/
Any short circuit at the horizontal output section circuit will shut down all the secondary SMPS voltages, as there is short circuit protection circuit to all Sony TVs.

Oct 28, 2014 | Televison & Video

1 Answer

Why do we have sound but no picture?


This is an older picture-tube projection TV.
There are just a few things that can affect all three color tubes at the same time. One of these is "Blanking" and the other is the High Voltage.

Blanking happens when there is not a good signal to the TV, and the high voltage and therefore picture are shut off to protect the high voltage system. Make sure there is a good, strong signal to test it from, like a DVD player, otherwise the TV could blank off from low signal levels. A signal good enough to produce sound may not be good enough to keep the picture on, so that is not a good indication of good signal.

The other, High Voltage, is complicated and dangerous to work on and best left to a qualified technician to work on. High voltage in a TV can hurt or even kill you if you get across it.

Jul 06, 2014 | Mitsubishi WS-55313 55" Rear Projection...

1 Answer

Hitachi L26D103. Less than 2 years old. Working fine one day. Turned on the next day and the sound works, but not the picture. This is an issue when in both the TV and DVD modes.


Good day!

If your TV doesn't have a picture even you play a DVD it means there is problem to your TV.It could be the Inverter board or the cold cathode lights is busted.


This are the steps on how to fix that problem.
  1. Remove the back cover of your TV.
  2. After that,plug in the TV and power it ON to perform a voltage data.
  3. Check the the output voltage of your power supply by using multimeter tester (range in DC) then check the 24vdc(supply of inverter board).
  4. If you have 24vdc in power supply output,check also the input voltage of inverter board if have 24vdc.If doesn't check the wire connection from power supply to the inverter board.
  5. If have you input voltage of inverter then check the high voltage output of it,if have at least 500vdc so be careful to check it because it have a high voltage.
  6. If doesn't have high voltage output replace the inverter board and if have a output voltage the cold cathode lamp inside is busted so you have to replace it
The inverter board looks like this:
bugoy31_2.jpg


You can buy it to this link: http://www.shopjimmy.com/catalogsearch/result/?q=Hitachi+L26D103+inverter+board

If this solution will be helpful please rate my answer. Thank you and good luck.

May 06, 2011 | Hitachi L26D103 LCD TV

2 Answers

Model TC-32LX700 Power indicator light on from is


Problem is caused by voltage irregularity. Pulled plug for an hour and then plugged it back in. TV reset and it works fine. If this does not work it needs a TV technician.

Sep 14, 2009 | Panasonic TC-32LX700 Television

2 Answers

1999 sony trinitron color tv -no picture-no sound.


Hello c_car,

What is happening is that the Shutdown Circuit is turning the TV off due to excessive current flow. The excessive current flow is most likely the result of a problem in the HV (High Voltage) section of your TV. This could mean that the Horizontal Output Transistor or the Integrated High Voltage Transformer has malfunctioned (developed a short circuit). I would advise that you let a qualified TV technician work on the set due to the nature of this problem.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Jan 19, 2009 | Televison & Video

1 Answer

Television won't power up


It sounds like the high voltage circuit got damp and arced. This arc caused the horizontal output transistor to short.
You might try replacing the output transistor if you're experienced in this type of repair. If not then you need to take it to a repair shop.
The "whistle " you're hearing is the power supply indicating that it has a short on its load. When the power supply has an over load (short) its frequency drops down when your ear can hear it oscillating. This type of power supply is a switching power supply normally operating a several thousand hz(cycles) which is out of range of human hearing.

Stargazer

Mar 15, 2008 | Televison & Video

1 Answer

Sony TV model KV29F3U


check high voltage rating capacitor hoirzontal output or around the the flyback transformer. if you need my help....dnlsabangan@yahoo.com

Feb 15, 2008 | RCA F27645 27" TV

1 Answer

No picture or sound - TV makes chirping noise


The chirping sound is the power supply coming up then breaking down because there is a short somwhere in the high voltage. The most common fail in this area is the horizontal output is shorted ( 237470 ) but what cause this short could be simple cold solder joints or the High voltage transformer ( 239111 ) If you have noway to "ring" the flyback change both parts

Feb 13, 2008 | RCA Scenium D40W20 40" Rear Projection...

8 Answers

Tv has sound but no picture


Sounds like you have lost video somewhere in the video circuits. Possibly the picture tube could have gone bad or lost filiament voltage. You can check to see if you have high voltage by holding your bare arm close to the screen. The hairs will stand up if you have high voltage. Absence of high voltage will also cause a black screen,but the sound might not work either since on some sets the power for the sound is supplied from the same circuit as the high voltage. Stargazer

Jan 24, 2007 | RCA G36710 36" TV

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