In a lot of five faulty Kaon KTF-200S set-top boxes, they had faulty power supplies (except one - a KTF-V200S, which had good capacitors, those being Samwha SD Series).
All of the 1000uF 10V capacitors on the power supply bulged, with C10 (before +5V output inductor) and C15 (before +2.5V output inductor) being discoloured.
C18 (before the +12V regulator) had minor discolouration, but was not bulging.
All of the Xunda TM series capacitors were replaced with Nippon Chemi-Con KY Series; the 400V unit was replaced with a KMG series unit, with the following upgrades:
C8, C20, C21: 100uF 50V
C18: 470uF 25V
C19: 470uF 16V
All five set-top boxes now work perfectly after replacing the electrolytic capacitors.
On the logic board, there were Xunda capacitors all over the board (none were bad) - since these set-top boxes were made in Korea, I don't quite understand how Kaon would use Chinese electrolytic capacitors in them.
All of the 1000uF 10V capacitors on the power supply bulged, with C10 (before +5V output inductor) and C15 (before +2.5V output inductor) being discoloured.
C18 (before the +12V regulator) had minor discolouration, but was not bulging.
All of the Xunda TM series capacitors were replaced with Nippon Chemi-Con KY Series; the 400V unit was replaced with a KMG series unit, with the following upgrades:
C8, C20, C21: 100uF 50V
C18: 470uF 25V
C19: 470uF 16V
All five set-top boxes now work perfectly after replacing the electrolytic capacitors.
On the logic board, there were Xunda capacitors all over the board (none were bad) - since these set-top boxes were made in Korea, I don't quite understand how Kaon would use Chinese electrolytic capacitors in them.
Attached Files