My samsung HCN4226wx1xaa will not power up with the CG Amp +/_20v plugged in. Unplugging it allows the set to power up with the raster and sound. My schematic of the Sub1 and sub2 bd is not real clear and can't find the signal source that is keeping the power supply from coming up with the board plugged in. None of the fuses are blown from this problem.
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Replace R858 and R859...They also go bad frequently when the STK chips fail.
For everyone else...
All projection TV sets have two very common problems. One is convergence ( 3D/Warped video or dead set) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.
Common Problem #1) Convergence has gone out
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. In some cases the TV will also not show any video. 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 pics of convergence problems.
Common 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.
Part # BP95-00142E is the correct convergence amp board for a model # HCN4226W. Part # BP94-00155A is listed as a "CG Amp assembly board" also, but is not correct for a model # HCN4226W. They are both basically convergence amp boards. Here's a link to order the original Samsung covergence amp board for this model (HCN4226W) from a major parts distributor:
to test this set
unpug the 4 pin conector labeld + and _ 20v on the cg convergence module
if set turns on, the problem is that modual
replace bolth convergence IC'c stk392-040
also check all 3.9 ohm resistors and both pico fuses.
Mine is doing the same thing. I just talked to the repair guy. It is a power supply problem. Try unplugging it for 5 minutes and turning it back on. Also if you were having problem with any picture issues it is the convergance, and that requires chip replacement. They are estimating $350.00 to replace the power supply.
It's most likely convergence -- the small board up and to the right inside the back of the TV, which has two large amp Ic's attached to it..
Unplug the +/- 20v line on the fron left corner of that board (red in color) and then try and power on the set... If the set comes on the board needs to be repaired and it's an easy unplug and two screws that mount it inside.
If this is an HCN4226 open the back and locate the convergence board - it's up and to the left mounted on the frame rail. Unplug the power to it, the board is marked with a +/-20v symbol. Now plug the unit back in and try to power it up. If it comes up and has good sound that convergence board board needs to be repaired. The amps on it need to be replaced and both the return and line resistors have to be tested and replaced as needed. Some shops, ours included, have started offering cooling packages to help prevent this circuit from overheating by mounting a cooling fan directly in front of the amp board. It's an inexpensive measure to help cool that circuit.
It requires some pretty good solder skills and there may be a couple of resistors that need to go also. Take that CG board out it probably doesn't need it and you will likely have to completly re-align the set after repairing it with the new CG in there, just the IC's and resistors usually require minimal alinment