Originally Posted by wswain
So LaxLong, did replacing the LED Driver Board solve the "pink" problem? I have almost the same issue with my HL67A50 (with the additional issue of reduced brightness). I too love my 10-year old Sammy (with a 2-year old DLP chip) and would love to keep it kicking (or at least restore it to "normal") so that I can donate it. Any help appreciated.
Yes, I believe the LED driver board was the issue. I replaced the sub-power board, and that didn't fix the problem. I swapped the light engine (or optical engine as Samsung calls it in the service manual) and the problem went away. I believe the light engine only has six electronic components, the three RGB LEDs, the actuator, the DMD board, and the LED driver. While all of these were obviously replaced when I swapped the light engine, the problem I was having was LED-related, which meant it could only be the LEDs, LED driver, or the sub-power board. I ruled out the LEDs and the sub-power board, which only leaves the LED driver.
Make sure all three of your LEDs are working properly by using the built-in test screens in the service menu. Be careful in the service menu as you can mess up the output of your TV, though performing a factory reset will get you back to defaults. With the TV off, press MUTE, 1, 8, 2, and the POWER on the remote. Use the down arrow to move down the menu to DDP3021 and hit enter. Then scroll down to Test Pattern(DDP) and hit enter. Once Test Pattern(DDP) is at the top of the screen, you can use left and right arrows to move through the test screens. Moving right after initially entering the Test Pattern(DDP) screen will give you the red, green, blue, and white test screens in that order (along with several others subsequent to these first four screens). Each of the red, green, and blue screens should be of equal brightness and uniform. If the fourth test screen is magenta (pink as I originally called it) instead of white you probably have the same problem I did. You can exit the service menu by hitting power.
The LED driver can be had on eBay for $35 shipped. There might be a how-to on this board for replacing the LED driver. The service manual for these TVs can be had via Google quite easily, and it explains how to replace the LED driver quite well. It's really an easy job if you know how to use a screw driver.