Why Can TV Manufacturers Learn to Solder Properly?
I can think of several potential reasons – all solvable but at higher manufacturing cost. • Mass of large component leads (like shields) does not get adequately heated during manufacture leading to latent cold solder joints. While they may look OK, the solder never actually ‘wetted’ the heavy pins and therefore did not form a good mechanical or electrical bond. • Thermal cycles and differential thermal coefficients of circuit boards, traces, and solder. While it is not easy to do anything about the material properties, using plated through-holes or a similar mechanical via would greatly increase the surface area of the joint and prevent the formation of cracks. • Vibration. This is also directly related to the single sided circuit boards without plated through-holes to strengthen the joints. • Lack of adequate mechanical support (single sided circuit boards without plated through-holes (vias). I believe that the single most significantimprovement would come about by using plated throug
I can think of several potential reasons – all solvable but at higher manufacturing cost. • Mass of large component leads (like shields) does not get adequately heated during manufacture leading to latent cold solder joints. While they may look ok, the solder never actually ‘wetted’ the heavy pins and therefore did not form a good mechanical or electrical bond. • Thermal cycles and differential thermal coefficients of circuit boards, traces, and solder. While it is not easy to do anything about the material properties, using plated through-holes or a similar mechanical via would greatly increase the surface area of the joint and prevent the formation of cracks. • Vibration. This is also directly related to the single sided circuit boards without plated through-holes to strengthen the joints. • Lack of adquate mechanical support (single sided circuit boards without plated through-holes (vias). I believe that the single most significantimprovement would come about by using plated trhough
• Intermittent or missing colors • Some commentary on monitor and TV whacking • Retrace lines in picture • White/gray retrace lines • Red, green, or blue retrace lines • Bad CRT causing retrace lines • Red, green, or blue full on – fog over picture • Shorts in a CRT • Providing isolation for a CRT H-K short • Rescuing a shorted CRT • Picture tube replacement • High voltage to focus short • Dark picture • Brightening an old CRT • Picture tube brightener • More drastic measures to brighten CRT • Left portion of screen is dark or faded • Color balance changes across screen from left to right • Bleeding highlights • Trailing lines in one or more colors • Brightness changes from left-to-right across screen • Picture fades in and out • Occasional brightness flashes • Excessive brightness and/or washed out picture • Bad focus (fuzzy picture) • Focus drift with warmup • Bad focus and adjustment changes brightness • Charlie’s comments on focus problems • Blank picture, good channel tuning and s
