Question about Akai PT5492S 54" Rear Projection Television

3 Answers

I have no green color

Is it the bulb or circuit board or no power to it

Posted by on

  • enzociardi Nov 17, 2008

    i might have said it wrong i have red and blue colors the green color does not light up

  • enzociardi Nov 18, 2008

    ihave opened the rear panel and saw that the red and blue bulbs were lit but not the green one
    thank you

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3 Answers

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  • Master
  • 10,594 Answers

Check filament / heater connection of green gun at CRT socket mounted on board, might have cold / dry solder joints.

Posted on Nov 18, 2008

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  • Master
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The green lamp has gone in the back of the TV, just like light bulbs they only have a short life cycle

best regards

Posted on Nov 17, 2008

  • Lee Hodgson
    Lee Hodgson Nov 17, 2008

    oppps i forgot to say that you can change these yourself :)

  • Lee Hodgson
    Lee Hodgson Nov 18, 2008

    to take the green bulb out is should just unscrew, take it to a store and purchase another one, before you do that you can check that the green connection works by screwing one of the other bulbs to it, this will not damage the tv at all, if the bulb lights up then you know its the bulb and you have to replace it to get a decent picture

    kind regards

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  • Akai Master
  • 19,396 Answers

If there is not power at all, not even the red led on , then test a different power outlet.

If it is not the power outlet, then it is a faulty power supply board.

Posted on Nov 17, 2008

  • Ginko
    Ginko Nov 17, 2008

    If the model is the same listed on title, ti should not have any green lamp.

    The fact is that the Color convergence is not working because one of the convergence ICs is faulty.

    The convergence board should be tested.

    If your model is different from the one in title, then it can be a faulty crt.


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1 Answer

Bulb goes out after a few minutes


The ballast for the bulb is the culprit. That is the circuit board directly wired to the bulb. You can get a replacement on line at:
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your color wheel/ color main bored has gone bad (red flashing indictating one of 3 things depending on flashing. no power to main board. or to much power/bad board on one of the color boards) or you just need to replace the bulb in it. i doubt its a bulb issue bc you do see a greenness to it at first. but *** will auto shut down till the board is fixed. sorry for the bad news but this is your solution. . if you can tell me what model the tv is i cna find out exactly what it is and how many flashes.

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Mitsubishi wd-y577 blinking green timer light doesnt stop blinking ever. Replaced all caps on pcb and dmb. Unplugged dvi board and still flashing. When power is pressed after aural response that bulb is...


It's possible that you have a fried diode on the secondary side of one of the power supply transformers. Look for one that reads like a wire on an ohmmeter. Note that some diodes come in TO-220 packages so they look like plastic power transistors. (Don't be fooled by capacitor bleeder resistors - if present, these are in the tens to hundreds of ohms, so this is what you will read instead of the diode if the diode is good.) The whistling noise could be a switching power supply transformer with an overload as a result of the diode, although the primary-side power controller circuit should shut down immediately before letting that happen. It could also be coming from the speakers - that would be a hint to check the power supplies feeding the audio circuits.

If after that you are sure all of the internal cables are connected, especially to the light engine, it's time to start checking voltages and waveforms, beginning with the power supply. You apparently have power to the bulb and color wheel, and probably to some of the control circuits, but that of course is not all of the set. Most sets have some fine print on the power supply circuit board telling you what the voltage outputs are supposed to be.

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1 Answer

The colors are not sharp any more and they all blend in together, its either too much red or too much green or blue what can be the problem?


manual convergence should fix the problem if it does not the set most likely either has a bulb burnt out or a bulbs power / focus needs to be adjusted by taking off the panel and finding a 6 screw control panel

...
...

should look like that 3 screws in a row on top of another three screws each of thees control the power and focus of each color this is a somewhat delicate process and is a huge pain on larger tvs that you cannot completely see the picture or color while you are directly under in front of it so I had my gf come in the room and sit across to let me know which color was doing what if you dont have someone you will need to check after each adjustment

now the diagnostic
as i said each screw controls a colors power and focus the focus is used if you see an outline of a color around pictures if everyone looks like a dead jedi with a blue aura around them the blue focus needs to be adjusted and so on for each color if you skies or blue screens seem feint your blue power probably needs to be turned up and so on for each color

if through the course of this you can see the bulbs and notice one is out your probably looking at dealing with the color issue until the time you can purchase a new tv as the cost of the bulb and the technician needed to install it as they are wired to a circuit board and requires technical knowledge and tools


hope this helped
Robb

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1 Answer

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1 Answer

Problem with convergence


you dont need new CRTs (tubes) you need either the convergence Board or the convergence power supply board depending on the symptoms. If its only one color that is out of alignment its most likely the convergence board. If all the colors are out of alignment you need the convergence power supply board. you can get whichever one you need at the following link as they have both of those circuit boards and have free shipping. Heres the link,
http://servicemanuals.vstore.ca/

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Toshiba 65hx81 65" Rear Projection tv. black & white color/green


Yep, your problem is a relatively easy one to repair if you know how to solder. You better repair it before it blows the fuse though. There are two capacitors in the main power supply that are coming loose and need to be re soldered. There is a Toshiba service bulletin about it. They are marked C809 and C810 on the main power supply board. Good Luck

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1 Answer

AKAI PT4298HD


If you have a good picture except for a missing color all the various circuits are working OK. Most likely you have a bad solder joint or component in the red circuit. This would also be indicated by the fact that ocassionaly the red pops in. If you have the experience remove the boards and inspect for cracked or cold solder joints. Resolder anything that looks suspicious. If this does not fix it you will have to troubleshoot the red drive circuits from the CRT back to the video IC. Another possibility is that you have a bad/intermitant red crt. I doubt that you have the equipment to check this but you can test it by moving the green crt board to the red crt. If it now works the red crt is OK. If all this fails you will need to find a reputable repair shop to look at it. If the unit is more than 5 years old it may not be worth fixing. Good luck.

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