PHILIPS MAGNAVOX REAR PROJECTION TV [CRT REPLACEMENT PROCEDIGS]
PHILIPS MAGNAVOX - 51 MP6100 _ 51 PP9100 _ 60 PP9100 - REAR PROJECTION TV
REMOVAL OF A SINGLE CRT/LENS ASSEMBLY FROM THE LIGHT RACK
- Remove AC power from PTV.
- Remove upper and lower back covers. [1/4"] screws.
- Remove the barrier board and the shield cover from around the lens assemblies.
- Carefully remove CRT socket board for CRT of the CRT/optical assembly being services.
- Remove yoke and convergence plus, of the CRT/Optical assembly being serviced, from large signal module.
- Remove the high-voltage anode lead from the HV splitter block on the large signal module of the CRT/optical assembly being serviced. Remove ground leg connectors from the coupler frame.
- Remove the 4 (1/4") screws that secure the the CRT/lens assembly to the right rack. These four screws are located in each corner on the top of the coupler assembly. (Do not remote the bolts with pressure springs or inverted Torx screws of the CRT/lens assembly. The removal of these components could result in fluid spillage into the PTV cabinet.
- Carefully remove the CRT/lens assembly from the PTV cabinet.
SERVICING THE CRT/LENS ASSEMBLY
All repairs made to CRT/optical block assembly require the removal of the coupling fluid.
How to remove the PTV Coupling Fluid
- Lay the CRT assembly on its side with the plug pointing up.
- remove the plug [X8].
- Remove some of the fluid from the coupler to prevent spillage when the CRT is removed. An empty coupling fluid bottle with a cone top recommended to lower the fluid level within the coupler. Squeeze and hold the bottle and insert the tip of the cap into the drain hole of the coupler. Loosen the grip on bottle, allowing the fluid to be pulled up into the bottle. Save the fluid.
- Reinstall the plug [X8].
- Stand the CRT assembly up with the neck of the CRT pointing up.
- With an awl or marking pen, outline the edges of CRT onto the coupler. (The correct positioning of CRT to the coupler is critical to optimum performance of the optical system.
- Remove the four CRT mounting bolts, with springs and spacers, and remove the mounting bracket.
- Remove the four CRT mounting ear screws. [The mount ear screws are not use in some assemblies.]
- Gently remove any metal shavings from around the screw holes. Do not allow the metal shavings to get into the fluid. Note the position of the high voltage anode cap with respect to the coupler.
- Carefully remove the CRT from the coupler. Wipe any excess fluid from the face plate of CRT. Set CRT aside.
- Use an empty coupling fluid bottle to extract the reminder of the fluid from the coupler. Complete removal of the coupling fluid is not necessary when only replacing the CRT.
- Clean any remaining fluid from the coupler and CRT gasket channel using absorbant tissue.
- Make all necessary repairs
PHILIPS MAGNAVOX - CRT REPLACEMENT:
CLEANING THE COUPLER, C-ELEMENT LENS, AND CRT FACE PLATE.
- Remove all CRT coupling fluid as described in Part-1.
- Using denatured alcohol on a cloth made of 100% cotton or a lens cleaning tissue, gently clean the C-element [fisheye] lens, coupler and CRT face plate. Thoroughly clean the coupler assembly, including the expansion chamber bladder, and allow fully dry. [do not use soap or detergent type substances to clean the C-element. Water can be used as an alternative to denatured alcohol, but the assemblies must be completely dry before reassembly of the coupler and the addition of coupling fluid. A hair dried may be used to dry the coupler and its assembles before reassembly. If contaminated fluid is discovered , the coupler and its related assemblies must be completely disassembled and cleaned to prevent a reoccurrence]
- Replace the CRT and C-element gaskets.
- Reassemble C-element lens and output lens to the coupler.
REPLACEMENT OF CRT
- Remove plastic protective coating, if present, from the face plate of the replacement CRT.
REPLACING THE PTV COUPLING FLUID
- Before replacing CRT coupling fluid, ensure the expansion chamber bladder is fully collapsed. This can be easely inspected by viewing the bladder through the small hole on the expansion chamber assembly. If the rubber of the bladder is not easily visible through the small hole, then the bladder may be considered collapsed and fluid can be added. If the rubber of the expansion chamber bladder is visible at the hole of the expansion chamber, then the expansion chamber bladder need replacement.
- The CRT coupling fluid is critical to the optimal performance of the PTV. Use only part number (4835 310 67032) [three bottle kit] or (4835 310 67031) [single bottle], to ensure the optical integrity and performance reliability of the PTV when replacing CRT coupling fluid.
- Re-install the CRT gasket into the gasket channel of the coupler. Confirm the placement of CRT, C-element lens, and went plug gaskets.
- Place the CRT onto the coupler with the high voltage anode properly placed as repalaced CRT.
- Start the CRT mounting ear screws but do not tighten them.
- Tighten the CRT mounting ear screws in star pattern. make sure that the CRT does not shift position from the outline defined with marking pen previously. Do not over-tighten the CRT ear screws.
- Install the CRT mounting bracket and start the four CRT mounting brackets with springs.
- Tighten the bolts in star pattern.
- Lay the CRT assembly on its side with the plug pointing up.
- Remove the plug.
- Using PTV coupling fluid bottle with cone top, refill the coupler with fluid through the drain access hole. Completely fill the coupler chamber, so the fluid level with the top of the coupler at the plug. Wipe any excess fluid.
- Re-install the plug and check for any fluid leak.
- Install the repaired CRT/optical block assembly into the PTV and perform any necessary adjustments.
REPAIR OR REPLACEMENT OF THE OPTICAL/COUPLER ASSEMBLY
- Remove the four inverted type Torx screws, which secure the delta output lens to coupler. An inverted type Torx socket can be purchased using part number [4835 395 17303]
- Remove the delta output lens will allow access to the C-element lens, C-element gasket, and its assemblies.
