I have a Dell 2007FPb which shows no power or LED lit. I have the fortune of having two of these... so due to board swapping, I've narrowed it down to the main/logic board and the USB add on board as being bad. I have voltage coming into the logic board (19V) but nothing on it. Here is what I've found so far, and would love some help on where else to look:
Q6: Pin 1 to 3 show 43 ohms
Pin 1 to 4 show 43 ohms
Pin 3 to 3 show 0 ohms
Q6 is the same parts as Q9 and Q14... but these all have OL for those same readings... so I assume that Q6 is shot
U13: Pin 1 to 3 show 0 ohms
Pin 1 to 4 show 17 ohms
Pin 3 to 4 show 17 ohms.
Believe this is bad.
U5: Pins 1 to 2 show 0 ohms
Pins 1 to 3 show OL
Pins 1 to 4 show 0 ohms
Pins 2 to 3 show OL
Pins 2 to 4 show 0 ohms
Pins 3 to 4 show OL
Not sure if that is good.
F19 is open.
There are a couple of componets that I have no idea on what they are... FD3, FD4, FD5, FD6, FD7, and FD8... some are reading different from each other. So I assume some are bad? But have no idea what they are. Only says: S4 04 on them.
And where I'm most lost is that voltage comes in at the connector at the top of the logic board... 7 pin connector. I have 19vs on the two right pins... as I do on the good monitor... but after that I can only trace it to the interconnect between the two boards (where it then goes to the fuse F19) and if I follow it on the logic board, it goes all the way left to U12... but can't follow it any further. Not sure if it goes anywhere else...
Any help would be wonderful.
Thanks
Q6: Pin 1 to 3 show 43 ohms
Pin 1 to 4 show 43 ohms
Pin 3 to 3 show 0 ohms
Q6 is the same parts as Q9 and Q14... but these all have OL for those same readings... so I assume that Q6 is shot
U13: Pin 1 to 3 show 0 ohms
Pin 1 to 4 show 17 ohms
Pin 3 to 4 show 17 ohms.
Believe this is bad.
U5: Pins 1 to 2 show 0 ohms
Pins 1 to 3 show OL
Pins 1 to 4 show 0 ohms
Pins 2 to 3 show OL
Pins 2 to 4 show 0 ohms
Pins 3 to 4 show OL
Not sure if that is good.
F19 is open.
There are a couple of componets that I have no idea on what they are... FD3, FD4, FD5, FD6, FD7, and FD8... some are reading different from each other. So I assume some are bad? But have no idea what they are. Only says: S4 04 on them.
And where I'm most lost is that voltage comes in at the connector at the top of the logic board... 7 pin connector. I have 19vs on the two right pins... as I do on the good monitor... but after that I can only trace it to the interconnect between the two boards (where it then goes to the fuse F19) and if I follow it on the logic board, it goes all the way left to U12... but can't follow it any further. Not sure if it goes anywhere else...
Any help would be wonderful.
Thanks
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