Question about Akai PT4298HD Rear Projection Television

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Akai/Samsung PT4299HD Convergence Problem

In the service convergence mode, I can line up everything but red. The red would adjust at first, but not much. Now when I enter the service mode the red lines come on, then fade and disappear.

Should I replace the convergence board (Samsung BP95-00415C) or should I be working on the ICs STK394-250 (B4F17 and B4F19 on top of ICs)? If it is the ICs what fuses should I be replacing also? I'd rather not replace the enitre board >.< I'm a poor college student.
I can email the service manual with circuit diagrams if needed.

Thanks!

Posted by on

  • snttgc Mar 05, 2009

    Fixed!!
    I replaced the ICs and fuses. Then something else on the board blew and the tv wouldn't come on at all.
    So I decided to replace the entire board.
    Samsung BP94-01289A ASSY PCB MISC-PWR DEF;DP, HCP424
    Found it on ebay for $110 after shipping.

    Don't order this from partstore.com. They kept backordering it... I canceled my order, and found this one cheaper anyways.

    Before replacing make sure everything in service menu is at original values.

    I still had to fiddle with the manual convergence to get the colors right. In the regular menu, disable auto perfect focus. It's worthless.

    Since I had to look everywhere to find all the info I needed here's a summary of what I did.


    1. Try to align convergence manually (mute-1-8-3) *don't hold down mute, just press them in succession* Do red first, then blue, then green. Work from the center out. Mute the colors you are not lining up! Makes life easier.

    2. Don't fiddle with service menu if you don't have to. Don't do it without the service manual at all!! You can seriously screw yourself over. If you need it, google 4226samsung.pdf.

    3. IIF THE CONVERGENCE WON'T ADJUST in the service convergence mode, just replace the entire board. It'll save you time and frustration. No special tools needed.

    4. Don't open a tv unless it has been *UNPLUGGED* for several days at least. Capacitors stay charged for a long time, and tv capacitors carry a very dangerous amperage range. It's enough to do serious damage! Mine had been unplugged for 3 days, and I still got a tiny shock from bumping a screwdriver somewhere it didn't belong.
    Total money in TV $190. Not bad for a 42 in HDTV!!

    If anybody needs help, feel free to email me
    snttgc @ mst . edu
    I don't know a lot, but I can tell you what I tried, and what worked for me!

    Thanks to everybody who helped me!! My new TV is gorgeous!





  • snttgc Mar 05, 2009

    That picture sucks: Here's a link to a bigger version of the service convergence menu controls:
    http://img105.imageshack.us/img105/3618/...


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  • Akai Master
  • 5,138 Answers

Ck 3 low ohm resistors 2.7 ohms they will be on same board as ICs.

Posted on Feb 15, 2009

  • ladywinn
    ladywinn Feb 15, 2009

    Sorry i didnt know you havent replaced ICs Yet But do that first.

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SOURCE: Akai/Samsung PT4299HD Convergence Problem

Try resoldering the pins on the ICs first. If that fails to resolve the problem, change the IC responsible for RED. You should be able to determine that from the service manual. In that area you should also see either fuses or low valued resistors that feed the STKs. Check those as well.

Let me know if you need further info.

Dan

Posted on Feb 13, 2009

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
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*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
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*Red/Orange looking picture

You can see some more examples and find a fix herebb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Let me know if you need further info.

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Convergence problems are very common on all Projection TV sets including Sony,Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit wiith instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms
  • Screen Looks 3-D
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Problem #2

Another common problem is dull or washed out video.
Your TV may have one or more of the following symptoms....
  • Dull looking picture
  • White looking picture
  • Halos around objects
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You can see some more examples and find a fix here
bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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