Question about Samsung HCL4715W 47" Rear Projection Television

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Samsung hcp44752 From what I have read so far I think I have a convergence problem. I have a discolored two tone picture.If you know of anything I can do please email me at thank you.

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Re: samsung hcp44752


Posted on Jan 10, 2008

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Got new STK392-040 chips and picture is still distorted. Manual convergence still won't alligne all colors.

the 183 is entry into the tech menu===you need to test all the low value resistors around the convergence chips(only 6 or 8) and they will read low and a resistor with NO reading may be your problem.

Also these sets use a pico fuse going to each chip--either right with it or back at the source----know what a pico fuse looks like"

Mar 12, 2012 | Samsung HCM4216W 42" Rear Projection...

1 Answer

Power light flashing

unplug the convergence yokes then try powering up the set. If it powers up the ICs are bad.

Jan 29, 2009 | Samsung HCL4715W 47" Rear Projection...

1 Answer

HCM4215W convergence issue

mute 183 power.

You may have done alignment previously in service mode and not initialized or saved correctly. add/erase saves

The test for convergence ICs working is if the V and H can be adjusted for all colors in different picture quadrants. The adjustment may be so far off that it looks broken.

There may be low ohm resistors that have increased in value. Some Samsung chassis use low ohm resistors that have built in Zener diodes for stabilizing the voltage drop across the resistor. Replacing with ordinary resistors (as the schematic shows) may cause poor convergence that can be adjusted after warming up, but always varies noticeably when going from cold to hot.

Using the correct part number from Samsung will ensure that the right part is in place.

When 1 or 2 ICs fail with no resistor damage, only small or no adjustment is necessary (if the replacement ICs are well made and imitate the original). When resistors burn and are replaced, adjustment is required more often than not.

Call someone that has aligned and repaired numerous Samsung RPTVs and your problems will be over.

There is a list of repair techs on the Home Page. Projection Televisions

If you are in Calgary, call me.


Jul 13, 2008 | Samsung HCM4215W 42" Rear Projection...

2 Answers

Rec convergence will not work

Your IC's likely need to be replaced. Also check your resistors that corrispond with the IC's. Here is more info on this.

Mar 03, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

I think I have a convergence problem but looking through solutions I have become confused Help?

to tell which board you have there should be writing on the corner of the board in white.

Jan 27, 2008 | Samsung HCN4226W 42" Rear Projection...

2 Answers

Red convergence way off

I had the same issue as you pretty much exactly and so do others right around this last few weeks so I am thinking that this is a common problem with the product itself.

You can fix this pretty quickly with the link below. I bought it and it resolved the issue.

Jan 02, 2008 | Samsung PCN5425R 54" Rear Projection...

1 Answer

Sudden discoloration, ghosting, bowed horizontal lines in top and bottom of picture

The most likely cause is shorted convergence chips and possibly a few pico fuses.

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,Pioneer2_bing.gif 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
*Colors wont align
*Screen may look distorted or warped
*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
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix herebb0cf99.png

Nov 10, 2007 | Samsung PCL6215R 62" Rear Projection...

1 Answer

Blue is mis-aligned.

You need to replace the two convergence IC's - part# STK392-040. Also look for burnt/discolored resistors near the IC's

Aug 19, 2007 | Samsung HCL4715W 47" Rear Projection...

2 Answers

Convergence? not sure, check these pictures...

Check Convergence IC's for cold solder joint pins. Also check the resistors in front of the IC's, they may have smoked or changed value. Replace IC's if you see burnt or discolored resistors.

Jul 03, 2007 | Samsung HCM4215W 42" Rear Projection...

2 Answers

Sudden discoloration, ghosting, bowed horizontal lines in top and bottom of picture

The convergence ICs probably have a cracked solder joint on the foil side of the circuit board. Re-flowing the the solder would help. I will always replace the convergence ICs when doing this job. The labor remains the same and you will have to pay a few extra bucks for the parts. To fix this yourself, you will need to be able to identify the two convergence ICs, have a basic knowledge of electronics and be able to use a soldering iron. You will also have to do an alignment through the service menu.

Apr 01, 2007 | Samsung HC-P4752W 47" Rear Projection...

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