Pioneer Service Manuals
1) Determine which CRT is going out (Reg, Green, or Blue).
Pioneer SD-643HD5 Operating Instructions
Looking at your convergence adjustment screen will help.
2) Unplug TV 3) Remove the front panel 4) Locate the driver board attached to bottom of the bad CRT.
Pioneer SD-643HD5 Specs - CNET
5) Locate the two large The pioneer model listed here has two convergence chips and if one or both (should be both changed) have failed they need to be replaced.
Pioneer sd 643hd5 user manual:
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