Hi, I have this Rosewill 17" LCD monitor that displays the "2 seconds to black" problem.
I isolated it to the inverter system because I can still see image with a flash light.
The capacitors looks fine, but since this is the only thing I know to do. I went out to radioshack and bought some caps to replace anyway. and see what happens from there.
The 2 caps on the board are
220uF 25V KY brand
3.3uF 50V Su'Scon brand
I replaced them with
220uF 35V Xicon
I can't find 3.3uF so I did a parallel splice with
2.2uF 50V Nichicon and
1.0uF 50V Nichicon (it's easy to tell in the picture which one I did)
these 2 caps are non-polarized, I don't know if that makes a difference but I would like to mention here.
Now the Monitor still displays the 2 seconds to black problem.. not willing to give up, I cycled the power button a few times... every time I turn it off and back on it would display 2 seconds then black.
Then comes surprise, the image stays on after the third time or so. Now I am stumped as to what to look for.
I didn't try to repeatedly cycle power before recapping. so I would never know if the recap "improved" the situation. I am assuming since:
1. the lamps are able to stay on for prolonged periods, it's not at fault
2. same reason above the high voltage portion is not at fault
That leaves me to the power IC BA9741F. I would like some opinions before going out and buy it and try again.
If anyone need a better pic of the board please let me know, I have limited work space and need to put away stuff frequently, so it's very daunting for me to disassemble this thing again XD.
BTW, the brown stuff in front of the light blue cap is glue left over from previous cap placement. it is very hard so I cleaned up whatever I could and left it alone like that. If you notice some yellow tint it was flux left over from some solder reflow efforts that I did to random components (for lack of better ways to tell bad solder joints)
I isolated it to the inverter system because I can still see image with a flash light.
The capacitors looks fine, but since this is the only thing I know to do. I went out to radioshack and bought some caps to replace anyway. and see what happens from there.
The 2 caps on the board are
220uF 25V KY brand
3.3uF 50V Su'Scon brand
I replaced them with
220uF 35V Xicon
I can't find 3.3uF so I did a parallel splice with
2.2uF 50V Nichicon and
1.0uF 50V Nichicon (it's easy to tell in the picture which one I did)
these 2 caps are non-polarized, I don't know if that makes a difference but I would like to mention here.
Now the Monitor still displays the 2 seconds to black problem.. not willing to give up, I cycled the power button a few times... every time I turn it off and back on it would display 2 seconds then black.
Then comes surprise, the image stays on after the third time or so. Now I am stumped as to what to look for.
I didn't try to repeatedly cycle power before recapping. so I would never know if the recap "improved" the situation. I am assuming since:
1. the lamps are able to stay on for prolonged periods, it's not at fault
2. same reason above the high voltage portion is not at fault
That leaves me to the power IC BA9741F. I would like some opinions before going out and buy it and try again.
If anyone need a better pic of the board please let me know, I have limited work space and need to put away stuff frequently, so it's very daunting for me to disassemble this thing again XD.
BTW, the brown stuff in front of the light blue cap is glue left over from previous cap placement. it is very hard so I cleaned up whatever I could and left it alone like that. If you notice some yellow tint it was flux left over from some solder reflow efforts that I did to random components (for lack of better ways to tell bad solder joints)
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