Yesterday, I got a Topfield TF4000T STB from a local junkshop for a song.
Upon opening, I saw a bulging Samxon GF 1000uF 16V unit before the +3.3V inductor.
Replacing this capacitor, along with the rest of the electrolytics (except for the 400V unit) with Nippon Chemi-Con KY units fixed the problem.
The capacitor after the +3.3V inductor was a puny 100uF 25V 85C unit; it was replaced with a 1000uF unit.
Upgrades to the electrolytics were also performed, with the 47uF units being replaced with 100uF units, with C11-C17 being replaced with 470uF units (for the +22V, +17V, +15V, and +8V rails).
Initially, Topfield STBs used Samyoung and Samwha electrolytics (I have a TF5000PVRt with these electrolytics which runs hot, and is still OK after 5 years!), but now use Samxon electrolytics.
Does anyone have any Topfield STBs (satellite, cable or terrestrial) or PVR/DVR units with bad Samxon GF units?
Upon opening, I saw a bulging Samxon GF 1000uF 16V unit before the +3.3V inductor.
Replacing this capacitor, along with the rest of the electrolytics (except for the 400V unit) with Nippon Chemi-Con KY units fixed the problem.
The capacitor after the +3.3V inductor was a puny 100uF 25V 85C unit; it was replaced with a 1000uF unit.
Upgrades to the electrolytics were also performed, with the 47uF units being replaced with 100uF units, with C11-C17 being replaced with 470uF units (for the +22V, +17V, +15V, and +8V rails).
Initially, Topfield STBs used Samyoung and Samwha electrolytics (I have a TF5000PVRt with these electrolytics which runs hot, and is still OK after 5 years!), but now use Samxon electrolytics.
Does anyone have any Topfield STBs (satellite, cable or terrestrial) or PVR/DVR units with bad Samxon GF units?
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