Thomson T500 PVR bad Teapo SC after linear regulator
Recently, I found a bulging 100uF 25V Teapo SC Series unit (CV7) on a Thomson T500 PVR board.
This capacitor was on a +5V supply on the main logic board after a linear regulator connected to the power supply board +6.8V rail.
On the power supply board +6.8V rail was a 2200uF 16V Rubycon YXG before the output inductor with a Taicon 470uF 25V HW Series unit after it.
Somehow, high frequency ripple must have not been bypassed by the +5V linear regulator (IP5, an LD1117A), even though none of the electrolytic capacitors (Taicon HW and AQ, Nippon Chemi-Con KY and Rubycon YXG) were bulging on the power supply.
Had anyone else seen a bad electrolytic capacitor after a linear regulator with the input connected to a switching power supply?
This capacitor was on a +5V supply on the main logic board after a linear regulator connected to the power supply board +6.8V rail.
On the power supply board +6.8V rail was a 2200uF 16V Rubycon YXG before the output inductor with a Taicon 470uF 25V HW Series unit after it.
Somehow, high frequency ripple must have not been bypassed by the +5V linear regulator (IP5, an LD1117A), even though none of the electrolytic capacitors (Taicon HW and AQ, Nippon Chemi-Con KY and Rubycon YXG) were bulging on the power supply.
Had anyone else seen a bad electrolytic capacitor after a linear regulator with the input connected to a switching power supply?
Comment