Question about Philips 21PT4475 TV

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No raster, No sound

Model of the phillips tv x04636 21'' wooden was not found on line, i used the above to pass over my problem to you experts to help find a solution. the screen of my tv lights with no raster and sound. the channel display is also off. where does the problem lie. eargall waiting for you troubleshooting guide. best regards, sam wepukhulu

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Re: No raster, No sound

Your problem discription is not very detailed but certainly it sounds like the first place to look would be at the fuses if the set is completely dead. Good luck.

Posted on Jun 23, 2006

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When tv is powered on tv only displaying channel number and sound -no raster. using video mode displays are ok. sound is also ok

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.

Dec 06, 2014 | Sharp Standard (CRT) Televisions

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In LG 21" CTV, there is no raster on screen and sound is normal. When increasing screen of FBT only plain raster with retrace lines are appeared. when measuring voltage at cathode of CRT, picture apears...

Please try testing each voltage of RGB output in the small pcb attached to the CRT. If one of these voltages is missing (they are tipically almost of the same value), replace its output transistor. If all voltages are present, but very high (above 180V), please check the filter capacitor in the RGB supply voltage line near the flyback transformer (47uF/150/200V) by replacing it. It is cheap.
Please be careful when dealing with high voltage section of a tv set as capacitors may store a letal voltage. So disconnect the set from main and discharge any capacitor before dessoldering it.

If this helps you, I shall be glad.


Sep 26, 2013 | LG Standard (CRT) Televisions

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I got a problem in TV. TV starts and shutdown immediately, while from sound its looks like that raster is going up but no picture, no sound. Red light is blinking. This happens only when i power off the tv...

Hi Sikandar,
Let me know how many times red led blinks as there would be an interval of 3 seconds so count blinks from pause to pause.
Is it Sony AR25M61 model or any other?
Above info will help to diagnose problem.

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1 Answer

No vertical deflection, only a thin horizontal line.

Hi and welcome to FixYa,

A few ideas you may want to consider/explore;
  • While it is true that capacitors do dry out, the values that you posted (22uF & 32uF) are relatively low for the pump/boost capacitor which is responsible for the "top of the picture was a couple of inches short". Normally this should be around 100uF connected between pin8 & pin 12 of LA7836;
  • agree that the Vertical IC LA7836 is busted hence the single line;
  • in most vertical designs, there would be a diode from pin7 that goes to pin12 that needs looking into for a leak;
  • pin7 is the Vert B+ ~ 24VDC while pin1 is secondary B+ 9 ~ 12 VDC. In some designs to accomplish this, there is a dropping resistor from pin 7 to pin 1 and sometimes a zener diode from pin1 to GND parallel with a filter capacitor;
  • pin11 is the vertical output that goes to the yoke. From the yoke some design uses another capacitor (about 1000uF) before going to the ground through a low resistor (~ 1 ohm);
  • above mentioned parts need to be checked out of ciruit preferable and special attention to possible leaks of the diode when testing in reverse bias mode.
Good luck and thank you for using FixYa.

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High pitch buzzing.

Hi there
Let's make ur problem a bit clear. "white lines" how? where?
meaning retrace lines with full raster or a single vertical line?
buzzing sound? without even turning the power switch of the TV to "ON" or when u just plug the power cord?
I'll check for schema, mean while can u tell me where the resistor leads to? is it a fusible resistor? if so , to which area the resistor suppliers power?

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CS 35607 Mitsubishi TV No Video


Please CLICK HERE and once you are at the site enter your model no.

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The only thing you can do is unplug your video out lead from your dvd /cd player while playing it, also check your menu on your sony to see if it has a blank raster setting to activate. Second, why would you want to listen to a cd thru your tv, unless you don't have a stereo or surround sound system to play it on, of which I would definately have anyway. Hope this helps...

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Sound problem


  1. no picture &no sound raster ok.


  1. your problem is in tuner to vif section.
  2. check supply to TUNER & VIF section .
  3. check loose contact in above section.
  4. check components in VIF section.
  5. for ckt open the web site & download it fron there as given here.
  6. hope this will help.
  7. good luck.

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No raster, No sound, No channel number

wepu, Buddy it sounds like you got a power supply problem. As you say the picture is all blue?? With no video or sound and the fact that the channel display is out is the first indication that i would guess this. Do you still have the owners manual that you got when you first got the set? Good, cause thats the only place i can think of where to look in case of service over in your part of the world as I did try!! Man I tryed but to no avail. No one has heard of this model but that dosent mean that it dos'ent exsit!.. If your a tech or know your way around solid state circuitry then you should have no problem finding the fault once you get a service manual from the service location in your owners manual. Now if your not a tech and a handy man ?? If I were you I wouldnt mess with the tv as theres over 25000 volts inside the set and i've seen it make a grown man cry. Man dont attempt the repair or troubleshooting if you dont have the right or proper tools and equipment!!! Good Luck

May 26, 2006 | Philips 21PT4475 TV

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