Question about Akai PT4298HD Rear Projection Television

1 Answer

Blue line bowing down, irregular shape

Thank you, Techman, for your prompt response to my first posting regarding this TV. The set belongs to my daughter, who gave me an inaccurate description of her blue line problem. I saw the set for myself. The blue line is irregular and bows down from the top and up from the bottom. I am sure this description will prompt a different response from you and hope you can give us some advice. She tells me she has done everything the instruction book suggests, but I cannot vouch for that. Thank you.

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Sorry to say but you will need thehelp of a pro.The problem you are discribeing sounds like a Convergence defect,where the so called amps are bad and require replacement and a reajustment . Call around and see if you can get a quote ona Convergance repair Good Luck Walter Grzybowski

Posted on Sep 23, 2006

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1 Answer

Tv's picture is messed up.


Symptom: Blue convergence off, bowed inward at the top and bottom with No blue vert movement.
Cause: Replace IK05 (STK392-110) and RK54 (1.5 ohm/1W) and converge. RK50(2.2 ohm/1W)

Sep 20, 2009 | Hitachi 43FDX01B TV

1 Answer

Sony KP-43T75 rear projection set does not finish flash focus. According to manual it should finish by converging to white cross. Mine ends with a pink tint and a blue ghost to the right. Is this something...


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Screen looks 3D Colors don't line up One or more colors can't be adjusted when using the convergence menu. Screen is bowed or warped. Here is a quick test.... Using your original remote go-to the TV settings then go to the convergence section. Try to adjust the red and then the blue convergence. You should be able to move them up, down, left, and right. If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution #1 you need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for most models. If you don't see kits for your set send them a quick note under the contact us button please, you will get an answer within 24 hours or so.(excluding holidays Good Luck
Techman

Your TV most likely has one of two possible problems. Problem #1: Convergence Chip Failure ( common problem ) Here are some of the most common symptoms and example photos of a convergence problem Screen looks 3D Colors don't line up One or more colors can't be adjusted when using the convergence menu. Screen is bowed or warped. Here is a quick test.... Using your original remote go-to the TV settings then go to the convergence section. Try to adjust the red and then the blue convergence. You should be able to move them up, down, left, and right. If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution #1 you need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for most models. If you don't see kits for your set send them a quick note under the contact us button please, you will get an answer within 24 hours or so.(excluding holidays Good Luck
Techman

Sep 06, 2009 | Televison & Video

1 Answer

Samsung Progressive 100hz SP43W64P picture has gone out of focus on Right & Left side of screen?


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Screen looks 3D Colors don't line up One or more colors can't be adjusted when using the convergence menu. Screen is bowed or warped. Here is a quick test.... Using your original remote go-to the TV settings then go to the convergence section. Try to adjust the red and then the blue convergence. You should be able to move them up, down, left, and right. If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution #1 you need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for most models. If you don't see kits for your set send them a quick note under the contact us button please, you will get an answer within 24 hours or so.(excluding holidays Good Luck
Techman

Sep 04, 2009 | Televison & Video

1 Answer

Lost the convergence on my menu how do i fix this problem


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Screen looks 3D Colors don't line up One or more colors can't be adjusted when using the convergence menu. Screen is bowed or warped. Here is a quick test.... Using your original remote go-to the TV settings then go to the convergence section. Try to adjust the red and then the blue convergence. You should be able to move them up, down, left, and right. If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution #1 you need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for most models. If you don't see kits for your set send them a quick note under the contact us button please, you will get an answer within 24 hours or so.(excluding holidays Good Luck, if the menu is not there replace the convergence chips also as a pico or so is blown do not replace any blown pico fuses without first replacing the convergence IC'(S)
Techman

Sep 03, 2009 | RCA D52W23 52" HDTV CRT TV

1 Answer

I can't align the colors, manually, or automatically - is there a pratical fix??


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Your TV most likely has one of two possible problems. Problem #1: Convergence Chip Failure ( common problem ) Here are some of the most common symptoms and example photos of a convergence problem Screen looks 3D Colors don't line up One or more colors can't be adjusted when using the convergence menu. Screen is bowed or warped. Here is a quick test.... Using your original remote go-to the TV settings then go to the convergence section. Try to adjust the red and then the blue convergence. You should be able to move them up, down, left, and right. If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution #1 you need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for most models. If you don't see kits for your set send them a quick note under the contact us button please, you will get an answer within 24 hours or so.(excluding holidays Good Luck
Techman

Sep 02, 2009 | Hitachi 51F500 51" Rear Projection...

1 Answer

BAD PICTURE, DISTORED, MOSTLY ON THE EDGES, BUT THE BLACK LINE ON TOP IN HIGH DEF CHANNELS IS NOT STRIGHT ACROSS, IT BOUGHS DOWN LIKE A "U" SHAPE


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Apr 15, 2009 | Sony KP-51WS520 51" Rear Projection...

1 Answer

Blue and yellow out of alinement


Hello hbeakes,

I posted this before, I matches what you are requesting , so here goes:

It sounds like you convergence amplifiers have malfunctioned. If possible can you post a picture of what is happening. Again by the description you gave it sounds like the convergence amplifiers.

If you go to a shop the cost will about $400 - $500 (includes parts and labor).
If you do it yourself the cost will be about $25.00 - $50.00 (includes parts labor is free)

If you choose to do this yourself, here are the basic instructions:
1. Unplug the TV set
2. Take the rear bottom panel off
3. look for a large heat sink with two large black ICs (STK392-110) (6 sided components but rectangular in shape) on it, and remove the board the ICs are on from the TV set.
4. Unsolder the components using a soldering iron and a suction solder remover.
5. disconnect the components (ICs) from the heat sink
6. Unsolder all of the bias resistors and replace them with the proper values (usually 220, 150, 3.3, 2.2, and 3.9 ohms)
7. install the new ICs (STK392-110)
8. solder all connections IC and bias resistors
9. Inspect for shorts
10. reinstall circuit board
11. Plug the TV set in and turn it on.


I hope this helps

Thank you,
Shuttle83

Sep 14, 2008 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Philips 50P8341 green light


I believe its the vertical output IC. Diodes would tend to blow fuses . I would replace the vertical output and see if that takes care of the problem.

Aug 20, 2008 | Philips 50P8341 50" Rear Projection...

1 Answer

Tv picture shaped like hour glass


The link you posted has been deleted, so I cannot see the picture you posted. If the sides bow in like an hourglass and the red, green and blue colors are still aligned then there is a horizontal width or pincussion problem, but if the sides bow in and the 3 colors have separated and are no longer anywhere near aligned then you have a convergence problem, both of which should be serviced by someone with experience in servicing projection TV's.

Jul 03, 2007 | Akai PT4298HD Rear Projection Television

4 Answers

How can I unlock the TV?


Try pressing the "F" or function button and hold while pressing the Mute or "M" button at the same time. Good Luck

Sep 07, 2006 | Apex Digital AT2002S 20" TV

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