Question about Akai PT4298HD Rear Projection Television

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Pt4298hd no audio or video only flashing red timer light,no fluid leakage.I read the other posts,it was mentioned to replace convergence amp,where can i find one? any help appreciated.

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I will be more than happy to assist you. first is the red light blinking a code at all. if it is the convergence ic you can purchase these at any electronic component dealer.

Posted on Nov 04, 2007

  • Troy Shull
    Troy Shull Nov 04, 2007

    you will have to look at the ics to know which ones for sure you will need. they are mounted on a large heat sink. should be something like stk392-110 or stk392-120

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1 Answer

The screen shows a double print in red


Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:
ee1ca68.jpg

You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Mar 24, 2010 | Akai PT4298HD Rear Projection Television

2 Answers

I have a sony projection tv and the red is coming out of line where it makes you see double like a red rainbow effect shadow. I tried the flash focus and the problem still persists any ideas on where to go...


When you first turn it on,Count the flashes on the standby/power button.

Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground,or held high), IK video path is defective.

Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.

Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This isalso a problem in the power supply circuit, check T603 and R672.

Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted.Check IC1509, Q1505

Five blinks - AKB circuit (automatic kine bias), 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. In addition, unit could be in IK blanking, try turning up screen slightly.

Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206.

Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits
.
Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some projection models of Sony TV sets, this code means that T8005 (flyback
transformer), or the associative components in the high voltage circuits are defective on the D board.

Nine blinks - Replace D 6116 and D 6301 on the "G" board, do not resolder as this will fix the problem temporary. Or Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times
you get flashing, then change the switching regulator on the "G" board or check connections. Make sure the regulator is -12 or -13 (negitive).

Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors
are bad, check R8051 and IC8005, also on the "D" board

Please rate this solution

Jan 03, 2009 | Sony KP-53V80 53" Rear Projection...

1 Answer

Akai PT4298HD problemo


I'm not a repair guy, just happen to have one of these TV's. Seems to me that unplugging the Convergence Board removes it from the equation and suggests something else might be the problem. I got most of my help from here and also from this thread:

http://www.tv-forums.com/forum/TV_Equipment_C4/Projection_TV_Forum_F24/Samsung_42_Convergence_problem_P4569/

The samsung TV is the same TV as this Akai, it's just a rebadged Samsung.

One important difference in my TV from yours. I did have a timer light, and with the back off, I could hear it power up when I plugged it in and turned it on. The timer light would flash then it would go off.

When I removed the convergence board, I could clearly see burn marks on the bottom of the board where one of the amps was soldered on. That gave me some piece of mind in ordering the part. I just scanned that other thread but remember some people talking about the power supply failing as well as the main board, you might pursue those avenues.

I wish you luck in fixing this!

Mar 15, 2008 | Akai PT4298HD Rear Projection Television

1 Answer

TV cant turn on


replace the convergence board. you can get it from VanceBaldwin.com. The part number is BP95-00142E. Easy install. You can test this TV before you buy the part.

If you take off the lower back of the TV, you'll see the board mounted near the middle of the TV on the right. On mine the power connector is red. Unplug that connector, replug in the TV and turn it on. It should come on, but the picture will be a mess as the tubes won't converge (obviously).

Plug in the new board, and keep right on going... $78 delivered. Took three days.

Feb 23, 2008 | Akai PT4298HD Rear Projection Television

1 Answer

RED TIMER LIGHT BLINKS AND WILL NOT POWER UP HELP


Open back of TV, there will be two STK's (black boxes) unplug the harness connector from the power supply into the stk board and turn on. If you get some light to the screen, you know now to replace the two STK's and then replug the power supply to the convergence board. If that does not work, the power supply may also be bad.

Feb 11, 2008 | Akai PT4298HD Rear Projection Television

1 Answer

AKAI PT4298HD - Does not turn on


Mine had the same symptoms. It was the convergence board. I replaced it and all is fine. the part number is BP95-00142E and is available from vancebaldwin.com. It's simple to replace...

you can check this before you buy the part. take off the lower back of the tv. Convergence board is on the right in about the middle of the tv - top of the lower part of the back. comes off with one screw. you can unplug the power (mine was a red plug), then plug the TV back in and it should come on. If it does, picture will be bad, (it can't converge the tubes, obviously), but you should see the picture.

good luck

Jan 28, 2008 | Akai PT4298HD Rear Projection Television

1 Answer

Dead projection tv


replace ic's again with original part check low ohm resistors...disable one side of res. to test..john

Sep 12, 2007 | Akai PT4298HD Rear Projection Television

1 Answer

Akai


yep you need convergence amp replacment for your set..very common prob call experienced repair person for this job use original replacements....john

Jul 31, 2007 | Akai PT4298HD Rear Projection Television

1 Answer

Akai tv


have a good tv guy repace you convergence amp's john

Jul 31, 2007 | Akai PT4298HD Rear Projection Television

2 Answers

My Picture is in Red and Green??


This is a convergence problem. From your menu, go to Menu, Function, Convergence and then use you remote to try to adjust your colors. If you can not get them to line up this is a problem with the convergence board. The convergence amps (STK392-040 x 2)are internally shorted. These can be replaced or the whole convergence board can be replaced. It's cheaper to replace the amps, but more convienent to replace the board (especially for the less electronically inclined!! :) Hope this help you out....

Aug 22, 2006 | Akai PT4298HD Rear Projection Television

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