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behind the speaker grill open up the access panel look for the focus block - it has 6 knobs, labeled very small and hard to read, r, g, b - focus and screen -dont move screens unless you need to change the drive of the crts.
there is also a wingnut (mechanical) focus knob on each lens, dont move unless electrical focus doesnt work
You may have a bad blue picture tube but there is a way to deal with
this first---This is a 2003 model ---I
did one of these with the same problem a week ago---the set has a black
plastic block with six controls---three are Focus(red,green,blue)
the other 3 controls are Screen controls(red, green, blue) Someone has
to remove the entire piece on the front of the set below the
screen(usually a plastic part) most of the time it is secured with 3
screws on either side of the set in the back; once you remove the
screws the entire piece should pull out(pull from right to left(it will
not fall off or come out easy--it is held in with several large plastic
pegs) With it removed there is an inspection plate with 4
screws-----the screen/focus block is behind it.
You need to look
very closely at the block to identify the focus versus screen
controls----one row left to right will be marked Focus and the other
row left to right will be marked screen------YOU need to locate the
Blue Screen control(they are black like the block) With the set on(be
careful) go to a video
input with nothing connected---if you see a blue screen as well as the
input number turn the BLUE SCREEN CONTROL SLOWLY TO THE LEFT UNTIL THE
BLUE is gone.
If this cures the problem you may only be buying
yourself some time----if the blue picture tube is bad sooner or later
this trouble may return----I have seen sets where this was adjusted and
the set worked for a year or more with no repeat of the
trouble----replacing the blue tube would likely cost you 400 - 500
parts and labor.
IF YOU HAVE ANY QUESTIONS OR NEED ADVICE LET ME KNOW- I am here to help people.
Hi, this will probably **** you off but here goes anyway, That part can be purchased from on line parts places but my advice to you is "leave it to a tv tech". The part will NOT come adjusted to your tv, it has to be wired in correctly or you WILL damage your tv big time, once installed the set has to be turned on and all 6 controls WILL have to be adjusted, your dealing with a high voltage device and it can kill you if you handle it incorrectly once powered on, in other words you will probably never get it adjusted right and it`s dangerous to do by a non tech, just trying to help you out here, video-tek
This set has 3 CRT's (picture tubes)
Remove the back bottom cover
Clean the CRT's with windex and a soft cloth.
(Find the Screen/Focus block)----Remove front grill cover and panel which covers the Screen/focus block.
Cover 2 crt's and adjust the focus control for remaining crt---(using the convergence pattern in the menu for the set)
adjust for the best focus.
cover that crt and move on to the next crt using the same procedure.
After setting the focus on all 3 tube's you will have the best focus possible for this set. If picture is still bad, you have bad crt's and the set is junk.
Cost to replace the CRT's is enormous!
finally a consumer that gives us plenty of info :)
sounds like an overdriven green tube, the only thing you can try is to find the G2/Focus block assembly, either behind front speaker grill or remove back of set and look for a black box approximately 5"X5" , this box will have 6 philips type adjustment screws(plastic) 3 are for focus, do NOT adjust these,
the other 3 are marked "screen" the center screen adjustment screw is for green, turn it VERY slowly counterclockwise while the set is running and pray that your problem dis-appears, be advised that this is a HIGH VOLTAGE device so one hand in your back pocket the other hand turns the screwdriver, if the problem does not go away you have a poor green tube, good luck, sorry I can`t give you the exact location of the G2/Focus block, manufacturers move them to different places every year.
Remove the rear cover and adjust the focus control on the flyback. Use a non-conductive probe, available as adjustment tools from any radio shack. On the FBT (Flyback Transformer) you have two protruding adjustments - one marked screen, the other focus. The screen adjustment increases the G2 voltage to the crt and brightens the picture by increasing the voltage exponentially. You don't want to adjust the screen voltage. The other is the focus, you can easily turn that clockwise or counter clockwise and watch the screen to set it at your preference.
Hope this helps.
The blue picture tube of a projection tv is usually the weakest in ability to focus and in
most cases loses its focus ablility before the red and green. Connect a cross-hatch generator to the rf inputs of the unit and check to see which areas
are most out of convergence. The corners are usually the worst. HD will always bring out the slightest imperfections. If the unit was totally out of convergence, I would have suggested replacing the convergence IC'S.In my experience with rear projection, your problem is normal wear . You could conceivably improve the picture by adjusting the blue focus on the screen focus block. Scrivitron
behind the front grill is a door with 4 t20 torque screws in it, remove that & to the left will be a screen/focus block, three knobs will be for tube intensity STAY AWAY FOM THOSE. the other three will be your focus for each tube