Question about Pioneer PRO-710HD 64" Rear Projection Television

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Blue color gun just went out of wack. cannot re adjust. Blue lines make horizontal hour glass. down on top and skewed up and to left on bottom

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Sounds to me like a convergence problem. There are two convergence amplifiers inside the tv that keep the red and blue lined up with the green tube. This repair requires solder/desolder equipment and test equipment. What needs to be done is the parts need to be replaced on a circuit board. Most repair shops charge about 200-350 to do this repair. This set was very expensive and has many years of good life in it. If the service person says they need to replace the entire circuit board they are wasting your money. This board can be rebuilt by anyone with some experience in tv repairs. I would think that if a repair on that set doesn't exceed 450 most people would fix it. The set should stay in the home although some shops prefer to remove the circuit board to return to their shop for repair. Good luck, Russmann.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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Replace the convergence ICs they will be big black ICs and will have Part number on them example STK392-110
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I have a philips HD rear projection TV 60 in. inside there are six adjustment knobs. Three are color the other three are for brightness contrast and hue. Which is which Left to right


If yours is a rear projection TV the adjustment knobs on the focus block inside are screen (red, green, blue) and focus (red, green, blue). The ones you are referring to as color are the screen controls and they adjust the intensity of the color from each tube. The other set adjust the focus of each color. They are also not intended to be adjusted by the user. Unless major components have been changed these controls should not need adjustment. That is why they are inside the TV.

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1 Answer

Every thing on the tv is mostly blue


Read Each Step Completely - Make Sure 3 Color Guns Are Off And Cool -
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1. Remove Rear Dust Cover 2. Remove the Front Speaker Cover May be Held In By Plastic Pins and or Anchors on the Bottom Note" - Remove The Plastic Cover Just Above Speaker Cover Maybe 2 Piece. Remove The Screws Holding Top Of Speaker Cover. Then Pull Toward You the Bottom Maybe Anchored So Lift Up. 4.Once Speaker Cover Removed, May Have Screws Just Below Center Plastic Cover Remove Them, Now Remove Center Cover Between Speakers -NOTE" Do Not Touch, Move Any Color Convergence KNOBS" - Lift Front Screen UP - Towards Roof - It Has 3 Flex Grab Anchors On Top And 2 Pins One On Each Side Of TV Frame. - NOTE" Lay Screen On Floor It Is Plexi Glass So It Will Brake If Bent Or Drop Hammer On. NOTE"- May Have To Remove plastic Cover Frame positioned Around Front Screen And Then Remove Screws. 5. I Use Windex Glass Cleaner And Either Cotton Balls Or White Tube Sock On Color Gun Lens Covers And Clean Mirror Like The One In Bath Room. 6. Take White Sheet Or Bead Spread And Anchor On top Of TV With Weights, Stretch Around Each Side Of TV Use Chairs To Anchor On Each Side Of TV. Place Dust Cover Or Heavy Card Board Where Plexi Glass Was Positioned. 7. Turn On TV - go To Rear and Now You Can Adjust Colors Brightness And Low Light - High Light - Horizontal - Ect....While Looking at Picture. 8. Install In REVERSE - Order Just Wipe Color Guns Lens Last. Note" - If you have Wet/Dry Vac or Fan Or Blow Dryer Take A 2 - to - 3 Inch Paint Brush And While Brushing Circuit Boards Any Dust For That Matter Blow Dust Off And Out Even Brush Speaker Cover"...ECT...Do This Before Any Cleaning 9. Just A Thought If You Ever Want to Change Color Gun Cooling Oil - Wrap All Circuit Boards With plastic Bags And then I use Bath Towol And Paper Towols To Catch As Much Spill As I Can And Then Spray With Windex To Make Dry While Blowing Air Onto Spill - Also I have Found Clear Mineral Oil Like Johnson Baby Oil To Work As Well If Not Better Then Glycol Oil. I Get For $2.50 For 20 Oz Bottle.

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First you need to determine if it is optical skew or mechanical skew.
If the machine is used as a printer then do the computer prints come out skewed? If it is not connected to a PC then print out the counter list using UserTools/Counter. If that prints straight then you are dealing with optical skew. Ricoh's in general are bad about the left front corner of the machine drooping from someone pushing down on that corner. If you have optical skew try lifting up the left front corner of the copier and try making a copy. That might fix your problem.
If the UserTools/Couter print out is skewed then your back to a mechanical skew and there are numerous causes for that.
The optical skew is more likely so let's start there.

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1 Answer

Thin red horizontal lines across screen


While looking at your TV, remove the bottom right speaker grill. There you will find a cover held by a couple of screws. Remove the screws and behind the cover you will find the "focus pack" which is a group of 6 adjustment screws. The top screws adjust (in order from left to right) the brightness of Red, Green and Blue.

What you will do preferably at night (or with the room dark) turn the top left adjustment screw (Red) all the way to the left and then gradually turn it to the right until the point you can see the retrace line and then turn it slightly to the left until the retrace line disappears. That's it! You can do this for all three colors - if need be. These do go out of adjustment every now and then. The 3 screws on the bottom are to focus the colors individually to minimize "bloom" on the screen. It's best to be in service mode on your TV when doing this OR open up the cabinet and cover (with something) the other 2 colors while you adjust the focus of the color you're adjusting.

Good Luck!

S

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frist set blue and green than set red itwill shoew yu single chakall will be focous in single line than than gun will be allign horizontal if it will correct if itisnot comming than cathode problem.

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