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On switching Philips Tv type:21PT 240B/94R no sound,picture

On swithching on Philips Tv type:21PT 240B/94R no light,sound or picture comes.Blank screen.Red light blinks.

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I have Philips CTV 21 PT 240B/94R. and this time a problem are when set on chenel are not stop to change only forward and bottom right side Display Scan+

Posted on Nov 03, 2009

  • Dipankar Oct 04, 2013

    I have a simoilar ty . can I get the circuoit diagram?

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Not useful at all.

Posted on Oct 10, 2013

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Philips 21 pt 240b/94r tv is switching off automatically after 30mins running???can any1 help me with tis


Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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Engineers are right, you need a new LED panel., or the component that supplies the light to the screen.

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YOU NEED TO REPLACE BAD CAPS ON MAIN POWER BOARD 4167e67a-4c77-4574-ae00-a26d52afd0ea.jpg

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hi,
There is problem with the back light of your tv. In LCD tvs CCFL are used as back light to give light to independant pixels. CCLF lamps required high voltage to light. This high voltage is provided by the inverter board inside ths tv. If any one of the chopper transformer (high voltage transformer) have some problem then the inverter will shuts off itself preventing damges to the power supply.

You have to check the 24V from the power supply. If its ok the you have to check the inverter board.if avilabe replace the same. if you are not able to do the same i will prefer to consult some one experienced in it. Back light inverter board will look like one in the picture.
ajin_g_25.jpg

ok

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To make sure that the external speaker is good or deffective try to use others speaker.If the other speaker work it means that your speaker is deffective and if the other speaker not work it means that the problem is the sound output amplifier or driver of the TV.You need to check the inner part othe TV.The board of the TV inside at the sound section, just fallow the speaker wire to the board,that is the sound section.Check if theres a loose connection.

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You have no high voltage, like many in this forum, this model of Philips has some of the same problems. Look around here you may find the answer to your set. If not check Vertical IC, TDA8177, audio ic on signal board up front on left. check Power supply first for blown fuse, 1000, 2004, 1300, 1900 etc. No sound or pic means something is open. Does set has L E D lights on front of set?

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