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?
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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