Two days ago, I repaired a Wintel Win1X digital terrestial STB for my class instructor at TAFE, which he told me the box took about 20 minutes to start up. Looking through the vents when I was at TAFE, I saw two bulging capacitors (which were C8 and C10).
I did not take my changes of powering up the box before replacing the electrolytics, for the possibity of overvoltages caused my heavy loading of a rail through bad electrolytics.
All of the electrolytics were replaced with Nippon Chemi-Con SXE series, except for C2, with a Nippon Chemi-Con KMH Series (Nippon Chemi-Con is my first choice in quality Japanese electrolytics... been in business since 1931!
: )
As a good measure, I decided to make the following changes, board space permitting:
C8 (1000uF 16V) with 2200uF 16V
C9-C10-C11 (470uF 16V) with 2200uF 16V
C12 (220uF 16V) with 1000uF 16V
C13-C14 (220uF 16V) with 470uF 25V
C15-C16 (100uF 35V) with 470uF 35V
C17-C18 (47uF 50V) with 220uF 50V
C4 (10uF 50V) with 100uF 50V
and finally, C2 (68uF 400V) with 220uF 400V, as another good measure...
Now the box powers on within seconds, and is working perfectly, and also under bench testing, which shows no further problems.
The electrolytics replaced were brand "DM", ZL series, and two with a "S" logo, SK and EX series. Does anyone know about them?
It was too bad that a German manufacturer was let down with bad electrolytics...
I did not take my changes of powering up the box before replacing the electrolytics, for the possibity of overvoltages caused my heavy loading of a rail through bad electrolytics.
All of the electrolytics were replaced with Nippon Chemi-Con SXE series, except for C2, with a Nippon Chemi-Con KMH Series (Nippon Chemi-Con is my first choice in quality Japanese electrolytics... been in business since 1931!
: )As a good measure, I decided to make the following changes, board space permitting:
C8 (1000uF 16V) with 2200uF 16V
C9-C10-C11 (470uF 16V) with 2200uF 16V
C12 (220uF 16V) with 1000uF 16V
C13-C14 (220uF 16V) with 470uF 25V
C15-C16 (100uF 35V) with 470uF 35V
C17-C18 (47uF 50V) with 220uF 50V
C4 (10uF 50V) with 100uF 50V
and finally, C2 (68uF 400V) with 220uF 400V, as another good measure...
Now the box powers on within seconds, and is working perfectly, and also under bench testing, which shows no further problems.
The electrolytics replaced were brand "DM", ZL series, and two with a "S" logo, SK and EX series. Does anyone know about them?
It was too bad that a German manufacturer was let down with bad electrolytics...
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