Re: HP w2007 PTB-1773 - Where to start?
Ok, I got the new TEA1530AT part in and replaced it (See pic). I think I did a great job soldering it in. It looks clean for such a tiny part. I plugged it in and did an initial test, and got 11v solid across pins 1 (VCC) & 2 (GND)! Between pins 8 (Drain) & 2 (GND) showed a nice solid 160v, so I was ecstatic. Also checked some of the output voltages, and saw some at 5v!
So I plugged in the power board to the monitor, and the power light to the monitor flashes for a quick millisecond (should stay on) and no joy.
I disconnected the power board (powered, but not under load from the logic board) and now see that all of my voltages are oscillating back and forth. In chiasmic fashion, I checked the output voltages, and now see a constant fluctuation between 1.43v and 1.85v. I checked pins 1&2 and found a fluctuation between 9v and 10.5v. I checked pins 2&8 and found a fluctuation of 150-160v. Now when I check voltages between the huge cap (C805) I get a fluctuation still as well where it used to be more solid.
What is going on? What could cause this oscillation so early on in the PSU? What else can I probe that may reveal something?
Ok, I got the new TEA1530AT part in and replaced it (See pic). I think I did a great job soldering it in. It looks clean for such a tiny part. I plugged it in and did an initial test, and got 11v solid across pins 1 (VCC) & 2 (GND)! Between pins 8 (Drain) & 2 (GND) showed a nice solid 160v, so I was ecstatic. Also checked some of the output voltages, and saw some at 5v!
So I plugged in the power board to the monitor, and the power light to the monitor flashes for a quick millisecond (should stay on) and no joy.
I disconnected the power board (powered, but not under load from the logic board) and now see that all of my voltages are oscillating back and forth. In chiasmic fashion, I checked the output voltages, and now see a constant fluctuation between 1.43v and 1.85v. I checked pins 1&2 and found a fluctuation between 9v and 10.5v. I checked pins 2&8 and found a fluctuation of 150-160v. Now when I check voltages between the huge cap (C805) I get a fluctuation still as well where it used to be more solid.
What is going on? What could cause this oscillation so early on in the PSU? What else can I probe that may reveal something?
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