Question about Samsung HCL4715W 47" Rear Projection Television

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HCL4715W Rear projection "Red" color is dim

Color is off on set. "red is dim" Just put in new PCB SUB to fix convergence, great picture, but Red is dimmed.

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  • Mark Koonce Aug 29, 2007

    The other set of three dials on the focus block are only dummy dials or blanks.

    The dials are located directly on the CRT, and all three CRT dials turn but there is no response or change.

  • Mark Koonce Aug 30, 2007

    Yes, this is true. But the three marked for the screen are blanks! The dials are directly on the CRT boards, and this dials do not respond.

    Red is dim, and does not respond. Green and blue do not either, this is probably because they run in series with Red being the first in the series.

    Is there a possibility that something on the Red CRT board went bad? And can this be fixed, cheap.



2 Answers

Three are for the focus adjustments and three for the screen adjustments they should be marked /

Posted on Aug 29, 2007

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Screen adjustment,remove front bottom cove and find the focus block the screens are also on the same block,if your not sure don't try.

Posted on Aug 28, 2007


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Dim and Wavy Picture

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.
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 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.

TV set after fluid change


2c07611.pngSolution #2

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

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T'Con board fault. If you wish to get some details; visit the site linked here. Pull up older posts.

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Red CRT is dim....

Yes I did. You will need to get a service manual for this TV set to trace the voltage coming from the sweep power supply. If this is a problem that is new after you replaced the convergenbce4 board, you for sure have a broken wire or connection somewhere in the set. Have seen this happen may many times after a novice repairs a TV set. Good Luck

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Internal Screen Adjustments No Response

thr focus block assy.has the screen and focus controls on it it about 3"x3" in size has red wires attached to it and one feeding form the flyback transformer to it.

Aug 29, 2007 | Samsung HCL4715W 47" Rear Projection...

1 Answer

HCL4715W Rear projection CRT problem

your screen and focus controls need adjustment to acheive a good grey scale picture the adjustment are not on the crt neck boards.(focus block)

Aug 29, 2007 | Samsung HCL4715W 47" Rear Projection...

1 Answer

New PCB SUB - But blurry and color off.

have you tried to also adjust the lenses to fine tune the focus .

Aug 28, 2007 | Samsung HCL4715W 47" Rear Projection...

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