I installed a new lamp lamp starts to lite for 4 ot 5 seconds and goes out ,then lamp lite comes on
Most of the time it is bad capacitors in the power supply. These will be obvious from the tops of the capacitors being bulged up. The power supply is located on the front of the chassis cluster and is the only easy to get to board. You will have to remove a shield cover to get access to it. Getting the chassis cluster out is a major job by it's self. After removing the screws from the back, you need to remove the secondary back shield. The chassis cluster is on you left side. You will need to take the mounting screws out. There are 3 on the left on the bottom side and getting to them may require a stubby phillips screw driver. There are 2 at the bottom facing the back of the set and there is one at the top facing the back of the set. next you need to remove the the black data cables from the top of the chassis at the back of the set on the left near the fan. Next you need to loosen the wire harness wire assembly thar goes to the optical block. There is also a power wire cable that goes to the fan that is mounted to the secondary back shield. This needs to be disconnected. The chassis cluster should be able to be removed by pulling lightly making sure that no wire harness gets stressed. There should be 5 or 6 screws securing the power supply shield. Once the shield is remove, it is pretty easy to remove the power supply. It is mounted on it's side and should have 5 or 6 screws holing it in place. I would replace any capacitor that has a bulging top. The values are important and should be matched accordingly. Make sure you replace the capacitors in the correct position noting the dot indicates the negative leg position. Reinstall the board, chassis, and all plug connectors before applying power and turning on.
I hope this helps,
Dec 09, 2010 |
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