Question about Akai PT4298HD Rear Projection Television

6 Answers

IF REFERENCE TO AN AKAI PT46DL10 REAR PROJECTION TV. AFTER TV IS ON FOR A WHILE, THE PICTURE STARTS FLICKERING. IT IS LIKE A LIGHT FLASHING ONCE IN A WHILE

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  • lanrob Jun 18, 2008

    I DISCONNECTED AND RECONNECTED ALL CONNECTIONS AND MAKE SURE THEY WERE CLEAN AND CORRECT. STILL HAVE THE SAME PROBLEM. IT IS LIKE LIGHTENING FLASHES. IT DOES NOT COVER THE WHOLE SCREEN.

  • lanrob Jun 18, 2008

    WHAT DO YOU MEAN BY REHEAT THE POWER SUPPLY SECTION

  • lanrob Jun 18, 2008

    STILL HAS FLASHING

  • lanrob Jun 18, 2008

    I DID ALL OF THAT

  • lanrob Jun 18, 2008

    STILL FLASHING

  • lanrob Jun 18, 2008

    WHAT ARE CRT.

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6 Answers

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  • 1,894 Answers

Disconnect it from the receiver it was plugged into

if no problem comes means the problem is due to external interruption. some sort of interference probably with ground looping.

else it is internal.

Most of the flickering also comes from the 75 ohm connector in the back. Wiggle the cable and picture flickers.


Posted on Jun 18, 2008

  • 1 more comment 
  • dewan nafees ahmed Jun 18, 2008

    coming to internal issue

    >>Sounds like a L-MAIN board

    >>Could be a bad ground or its picking up some static in the air.

    >>Your problem may be due to intermittent power in the backlighting circuit.
    This is usually caused by swelling of electrolytic capacitors in the
    power board. If you can find an honest electronics technician it is
    about a $40.00 fix.

    >>try resoldering the vertical output. Its located on a aluminum heatsink.

    >>Check the Power Supply board to see any puffed capacitors. If found faulty cap, replace them.

    you must get fixed with any one of these above.

    thanks for ur patience in reading my solution

    hope it helped you

    dont forget to accept the solution if u go by it.

    thank you once again

    have a great day

    good luck


  • dewan nafees ahmed Jun 18, 2008

    http://www.youtube.com/watch?v=rt1282vcX...

    have a look at the video

    if that is happening what u would do is buy a can of freeze from radio shack and spay the
    convergance ic it as soon as it starts, if it comes back to normal it's
    the ic's if not try another ic or transistor

    http://home.earthlink.net/~oleg.filippov...

    if convergence ICs:
    Your set needs to have both Convergence ICs replaced they are Both
    STK392-010 you can get new ICs at the following link and they provide
    free step by step instructions with pics so you can do the job yourself
    which takes about 45 minutes. Heres the link.

    http://servicemanuals.vstore.ca/




  • dewan nafees ahmed Jun 18, 2008

    source: fixya co-experts solutions

    thank you once again

    have a great day

    good luck

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1:Check for poor solder connections on the sweep/power assembly.
2: Check the fuses on the convergence panel.

Posted on Jun 18, 2008

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Hello

if your set under warranty? - If so please get it replaced.
The CRT's might need to be replaced. That wont be cheap.

in this case I recommend you contact a professional repair man.

Posted on Jun 18, 2008

  • 3 more comments 
  • Ekse Jun 18, 2008

    The CRT (Cathode Ray Tube) Projection System

    When rear-projection televisions first arrived on the scene, television technology was based on the Cathode Ray Tube (CRT). In a CRT-based rear-projection television, three small CRTs (one for each primary color), coupled with a light magnifying lens, projects a color image onto a mirror and is then reflected onto a screen. With the proper video processing circuitry, CRT size, and lens combination, a CRTs can produce excellent high resolution images.



    read more here

    http://hometheater.about.com/cs/televisi...

  • Ekse Jun 18, 2008

    I may be mistaken this may be a DLP type television.

  • Ekse Jun 18, 2008

    Yes I was wrong this is not a CRT type rear projection.

  • Ekse Jun 18, 2008

    In this case the bulb would need to be replaced.

  • Ekse Jun 18, 2008

    It may also be a problem in the ballast which powers the bulb might be best to get a repair man inspect the television.

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  • 638 Answers

The problem in your tv is not external.
The problem is in the power supplies internal filtering.
On the primary side of the power supply main board you will find
a large electrolytic capacitor very near the fuse and the primary transformer( the small one). Next to this capacitor you will find a
large 5 watt diode.( black with a silver band at one end). Next to this you will find one lone 1/4 watt resistor. This resistor in conjuction with large electrolytic capacitor is responcible for the internal filtering of the high voltage side of the board. As your unit heats up( anywhere fron 5 to 30 mins) you will notice horizontal
flickering and prior to that red or green or even purple pixelation.
Check this 1/4 watt resistor for dark discoloration and or a bad solder joint on the solder side of the board. This resistor
is directly responcible for controlling the bias current to the high voltage regulators for the 160 volts DC. At no time should you handle or troubleshoot this board with the line plug in.
Even when this board is powered down that capacitor still holds a charge for up to an hour and can knock your you know what
in your sock. If you do not feel comfortable please take the board to someone else. Hope this helps.

Posted on Jun 18, 2008

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The most common problem of picture flickering,its by a power supply problem ,the solution is to reheat all the the power supply section and of horizontal section also. so flickering will gone.

Posted on Jun 18, 2008

  • LORETO LACARON
    LORETO LACARON Jul 10, 2008

    If
    still under warranty or if you have no electronic repair experience you
    should take the set back to the shop or to a repair person. Some of the
    solutions described below can be dangerous, TV's are very hazardous to
    service. Even when plugged out, TV's can store very high voltages.

    The
    five blinks(count them again just to be sure) is an error codes that
    stands for the following: "FIVE Blinks---AKB circuit (AKB), the
    timer/standby indicator blinks for about 30 seconds then goes to the
    self-diagnosis function. Something is wrong with the video. Check video
    out, Q705, 732, 761 and other components on the C board, also check
    Q218, 219, 220 on the A board. Also unit be in IK blanking, try turning
    up screen slightly."

    So what is the AKB? It is Auto Kine Bias;
    a circuit that holds the video OFF until the picture tube (kinescope)
    is warm enough to run video. So, if there is trouble within the AKB it
    may not be turning on the crt. Or, the crt could be cold, or there
    could be power supply problems (which I favor because the audio is
    gone, too, which means it is not a "video only" matter).


    Therefore, I do not favor replacing the C board (or A board as
    indicated in the url above). I favor finding out why the AKB circuit is
    not functioning.

    It is necessary to get the set to come ON
    long enough to make sure the crt is heating up. You may have to
    manually defeat the protection circuit and force the set to come ON. If
    you can find the ON relay you may be able to hold it ON manually - at
    least long enough to find out more symptoms, but not too long or some
    further damage may occur.

    Go to: http://www.schematicsforfree.com/archive... where you may find a schematic or service manual for this set - or one that is close/similar enough to be of great value.


    Last comment: Some sets will, upon failure of the AKB function, after a
    few seconds, go into diagnostics - which is similar to protection. So,
    the audio may be working okey. Turn the set on with the volume up; if
    you hear audio for the until the set cycles into the flashing light
    routine it means the audio is really good. So, check that carefully.
    You may have to do a hard reset to cause the AKB function to reset. So,
    do this: Unplug the power cord for 4 hours or more. That will reset
    everything.

    Hope this helped, or gave you a general idea, but please don't take a further step unless you know the safety issues involved.

    Good luck

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  • 790 Answers

Hello lanrob!!!


Many problems are due to poor connections. Don't just check your connections, unplug the cable, clean the ends and the contacts on the components if necessary with "isopropyl (rubbing) alcohol" and if possible "reverse" the ends. Put what was at one end into the other component. Make sure that the "colours match". Red-red, Green-Green, etc. Make sure the cables are inserted all the way. Often, if the connectors are very tight, people don't insert all the way. Check every connection - don't forget the ones coming from the wall.





Regards
Smilemaker

Posted on Jun 18, 2008

  • Kanth raj
    Kanth raj Jun 18, 2008

    there are many things in the set that can cuase this. Most likely there
    is a short on one of the circuit boards, or the power supply itself has
    failed!! U need to contact the technician

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