Hp 18.5V power brick problems

[pdavid]

A friend tried to to fix the broken cable of his adapter. He kind of messed up the soldering with his 100 watt iron and also screwed up something because the brick is now giving 27-30 Volts.
He measured it before plugging it to his laptop, thankfuly. The model is:KTL SU10184.
This thing works with an sg6842 pwm and 103a1 (lm432) comparator. There is a trimmer on the secondary but changing it doesn't affect the voltage.
I hope its just some desoldered resistor. I don't want to hunt down ics for this thing.

[mariushm]

Re: Hp 18.5V power brick problems

I have a hp charger around, if you want i can open it up and check resistor values for you or ic values.



this charger was picked up from recycling bin, the connector wasn't making proper contact as far as I could determine.

If you really need one, I guess I could mail it to you as long as you pay for the postage.

[pdavid]

Re: Hp 18.5V power brick problems

Thanks mariushm! If I can't determine some values then I'd really appreciate those measurements. I'm really curious about that ic on the secondary in the first place.

[mariushm]

Re: Hp 18.5V power brick problems

Ok, I opened it up again and desoldered the heatsinks and ICs so here you go.

on the long heatsink

P10NK60ZFP - N-CHANNEL 600V-0.65Ω-10A - TO220/FP-D²/I²PAK-TO-247
Zener-Protected SuperMESH™ MOSFET



and

on the small heatsink

FYP2010DN SCHOTTKY BARRIER RECTIFIER 100v/20a



If there's anything else you need let me know.

ps. on the back side of the board smack under the large primary cap there's also a small soic or so (whatever) 8 pin chip with the codes HP306 PBKX5 .. can't find a reliable datasheet

[pdavid]

Re: Hp 18.5V power brick problems

Yeah, these are the same mosfet and diode like in this unit. Could you take a pic of the soldered side of the pcb? That ic on the primary should be an sg6842.
I've found the resistor responsibe for the output voltage adjusting, it seems to be broken in half. I'll have some other stuff to do so I'm not going to patch this thing up on this weekend, but hopefully it won't be any more trouble from here.

[mariushm]

Re: Hp 18.5V power brick problems

The lightning sucks big time in my house, and flash would mess the board so I used my nokia phone flashlight feature to make it bright enough to get decent macro shots.

Hope they're good enough, I can always redo them or measure specific resistors if you want.