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DIY For Audio
Public service - Electrolytic Caps
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<blockquote data-quote="juan" data-source="post: 1072899" data-attributes="member: 2499"><p>Many moons back I repaired thousands of CRT tube monitors and it was clear that some manufacturers design a pcb in a way that they are guaranteed for future repairs of their own product, example the primary side of psu they will fit the pulse width modulator IC filter capacitor right next to the HOT heatsink that will dry up the cap after a few years and result in a dead unit no fire and easy fix. The same on secondary caps they would fit the heater rail cap next to a fat DIODE so that it runs dry and safely trips PSU again easy fix. Acer used to install a very low voltage flyback cap that 99% fail after 2-3 years of use easy fix, they also glued one of the CRT colour driver drain resistors together so that they simply everheat and goes open circuit also easy fix.</p><p>80% of all my repairs I diagnosed without removing covers just a quick kettle plug connection and listen to current ruch. </p><p></p><p>I think these things is pre planned not bad designs.</p></blockquote><p></p>
[QUOTE="juan, post: 1072899, member: 2499"] Many moons back I repaired thousands of CRT tube monitors and it was clear that some manufacturers design a pcb in a way that they are guaranteed for future repairs of their own product, example the primary side of psu they will fit the pulse width modulator IC filter capacitor right next to the HOT heatsink that will dry up the cap after a few years and result in a dead unit no fire and easy fix. The same on secondary caps they would fit the heater rail cap next to a fat DIODE so that it runs dry and safely trips PSU again easy fix. Acer used to install a very low voltage flyback cap that 99% fail after 2-3 years of use easy fix, they also glued one of the CRT colour driver drain resistors together so that they simply everheat and goes open circuit also easy fix. 80% of all my repairs I diagnosed without removing covers just a quick kettle plug connection and listen to current ruch. I think these things is pre planned not bad designs. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Public service - Electrolytic Caps
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