Tuesday, May 31, 2011

How do i change a green 07mvc21 projection tube in my tv?

just need help figuring out how to do it....How do i change a green 07mvc21 projection tube in my tv?
THAT is a MAJOR JOB!!

Removal of CRT involves CRT board disconnection, Ground strap disconnection, then dropping the YOKE and the magnetic alignment rings just under it. THEN from the top, removing the 4 --1/4 inch screws that secure it to the frame, then pushing in and rotating 1/4 turn the HV Anode wire for the green CRT....



Then taking it out, removing the LENS (making sure of the actual position of the lens to the CRT....improper rotation of the lens will result in the OUTSIDE Edges of the picture being un-focus-able) If there's black metal strips UNDER the lens you MUST install them EXACTLY where they came from.....



THEN removing the White Fiberglass tape and installing it EXACTLY where it was positioned before....and the Black tape too....I just replace the black tape.....



THEN reversing-order the FIRST PARAGRAPH INFO, making sure the Magnetic Rings are properly positioned on the NECK of the CRT and rotating for tightest spot.....SAME with the YOKE.....



THEN you have to MECHANICALLY CENTER it, rotate the yoke for level picture, adjust the Electrical focus for TIGHT focus, then the MECHANICAL FOCUS, then double check the Electrical Focus......Also set the Screen voltage to where it's just on the edge of illumination on a black picture input......



THEN COMES THE Coarse Convergence and the 100 point FINE CONVERGENCE in FULL MODE....then the Wide Zoom mode, then the Flash FOCUS alignment....and IF the squares don't align with the SENSORS....YOU'll NEVER get it right without 2 years of alignment experience......



NOW....I think that amount of work is worth $300 for an expert to Easily do...... and get it right.....

But you're welcome to TRY.....and when you NEED an expert....He'll be sure to charge $500 to fix it....WHY? Because you will have LOST all references that he'll need to do it properly......



Somethings are better left to the guy who has experience....this is one of those situations, and I hope this QUICKIE sheet of alignments drives home my point......



DON'T try this at home kids.......

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