Re: Dell 1704FPT

Hi budm,

Sorry to be so novice in electronics.

I improved a little bit my knowledge about the SMPS.
I understand the basic difference between linear PS and Switch mode PS.
I better figure out the components function on the primary side than in the secondary side on the board.
I guess you wanted to enlighten me to the possibility of a short-circuit in one of the rectifiers in the secondary (1 SB1060FCT & 2 ER1002FCT) side that could create an excessive load signal to the feed back pin (via an activation of the...

Re: Dell 1704FPT

I replaced the 11 caps surrounded in the attached pic.

[I]"So you did not replace the small lytics start-up/running cap in the primary side?" [/I]

Which one do you mean on the picture ?

"[I]The rectifiers in the secondary side are all OK?"[/I]

Where are they located on the board ? And how to test them ?

Thanks for your help.Re: Dell 1704FPT

I replaced the 11 caps surrounded in the attached pic.

[I]"So you did not replace the small lytics...

Re: Dell 1704FPT

Hi, I read all above posts concerning this thread, but didn't find answer to my problem.
I had some trouble to switch on my Dell 1704 FPTt monitor. The greenlight from the front panel remained faded.
Changing all caps on the low voltage side of the power board helped solved the problem for a while until a recent grid power failure.
I measured the voltage at several points on the board and noticed that the + 5 V leads from the power board to power on the video control board were not stabilized (the value oscillated from 0 to 3 or 5 Volts with...