Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Tv wont turn on after fixing convergence problem

I made sure i did everything right but when i plug it in the tv wont turn on.
the red light in front flashes thne it turns solid. so i press the poweer button and it sound like it powering up but no picture comes on. in min or 2 the red light goes off.

what could be the problem?

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  • mikeryan Apr 16, 2008

    its a Samsung HC-P4752W

  • mikeryan Apr 30, 2008

    i checked all my soldering they were bridged and i fixed that. I checked my connection they were hooked up right.

    I got the same problem but the blinking light in the front still flashes but it only flashes four times (a second between each flash) and then it stays red. When i push the power button again nothing happens.

  • mikeryan May 04, 2008

    ok i found 2 bad resistors havent replaced them yet but could u E-mail me a schematic so I go through everything and make sure there are no other problems.

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  • Samsung Master
  • 8,617 Answers

Check the pins with a strong magnifying glass to make sure they are solderd correctly with none of the pins bridged with solder, then recheck all the wire connections to make certain they are correctly hooked up.

Posted on Apr 29, 2008

  • Sonny Berry
    Sonny Berry Apr 30, 2008

    If the pins were bridged and you powerd it up you may have opened a couple of the convergence resistors located right next to the ICs these will need to be checked with an ohms meter but 1 side of each resistor will need to be removed from circuit to acurately check them.

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1 Answer

When i turn on the tv there is no sound only clicking sound and no picture. then it atomaticly turns off. also the lamp light flashing red? not sure what is wrong.


Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • 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.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

42d3683.jpg

7859b01.jpg

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Here is a quick test....

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

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

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

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Wont work


3 blinks is convergence error.

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1 Answer

TV won't turn on after a repair


you changed all the eprom info but didn`t "save to ram" before un-plugging ac cord, you will have to call a tech and be sure to advise him what you have done so the tech will be sure to bring service manual, info will have to all be re-entered, video-tek

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Adjusting the blue convergence on tv


1st. Go back over your soldering and make sure you didn't break a trace and joints are solid.
2nd. Make sure you installed the correct value resistors in there places.
3rd. I believe the blue crt is on your right, follow the convergence leads down to the board to the 4pin plug. Go from pin 1 of the plug to pin 11 on each of the IC's ( 1at a time ) with an ohm meter, when you see 0 or just about 0 that will be the blue IC, I have the PTV 915 manual that i'm using. I suspect you will find a mistake along the way. Take your time and double check everything again and let me know. Good Luck!

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Hitachi projection tv


Solution:
Your TV has a convergence problem. Here are some of the most common symptoms.

Screen looks 3D
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed in but stationary.
Here is a quick test....
Using your original remote go-to the tv settings then goto the convergence or magic focus 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.
You can get a repair kit that includes all the parts from www.TvRepairKits.com.
They have put together a kit for the Hitachi TV sets.
The kit includes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc.
Everything you need to fix it yourself. Its a fairly easy fix on the Hitachi sets.

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1 Answer

Troubleshooting AV-65WP74


You need to replace the two Convergence amp ICs they are both STK392-110 thats a easy reapir on that model , But dont remove the rear panel with the power cord plugged in you will destroy the digital circuits. the Ics are up front behind the speaker grille. You can get new replacement Ics at the following link with free instaltion instructions with pictures. Here's the link,
http://servicemanuals.vstore.ca/

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Toshiba TN55X81 Wont turn on but I hear clicking


Pull the three connectors to the yokes on the convergence board. If the set powers up, it's a good chance the STK392-110's need to be replaced. I fixed one today, and it has been running for 6 hours now.
-Dan

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7 Answers

Samsung HCN4226WX/XAA Rear Projection 42" TV Wont Turn On


take off the back there is a board at the top right with two black stk-392-040 chips on it unplug the red connector at the left side of the board then plug set up and see if it comes on if so the chips on the board are bad or replace the board about $100.00

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JVC MODEL # AV-48WP74 48 IN. BIGSCREEN TV.


I had a problem with my TV colors not lining up. One day I turned it on and the green was out of wack. I checked this message board and replaced the STK chips, bad soldering and all led to me just giving up on that and buying a whole new Convergence Board ($185). I just plugged this in and though now my Green lines up okay, my red is out of whack. Is there something I am doing wrong? Can anyone help me? Did i miss a step? Frustrated......Bruce

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5 Answers

No power,red power lights keeps flashing.


I had the same problem with the 47" version. I called the Sears technician who tried for more than an hour to fix the problem, even calling Panasonic. Final solution: a board repair for $550. Now I have a plasma and a big desk.

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