pls can any body here help with my CQ61 not switching and i check the battery terminal the normal volgate is there to charger and power it.dont know what to do pls
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Re: not switching
Any recent mishaps with your Compaq laptop, such as dropping it on the floor? Does that model have a power led at the jack? -
Re: not switching
not there is no mishaps or drop on floor , it work with battery alone when i charge the battery some where it work but with charger is not working .Comment
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Re: not switching
So it doesn't work with the adapter at all?
Schematic: http://lqv77.com/download/546/
Power circuitry is on page 31. Starting at DC JACK in the upper right corner I would check all the components between +VA and +VIN. I suspect the MOSFET PQ48 is open.Comment
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Re: not switching
have you check the power session of the board , i still don't can't fix it pls help meComment
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Re: not switching
check the pu4 chip and the pr199(220 ohm) resistor near the battery connector .also check pr183 resistor near the memory slot.Comment
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Re: not switching
i will check it and let you know.Comment
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Re: not switching
0kComment
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Re: not switching
check the pu4 chip and the pr199(220 ohm) resistor near the battery connector .also check pr183 resistor near the memory slot. have check all what you gave me but still not switching, when i lifted the PR199 there will not be any voltage at battery terminant. i don't know what to do again.Comment
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Re: not switching
still need helpComment
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Re: not switching
the pr199 should have 22ohm value at your multimeter not 220 sorry.Comment
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
These cheap non brand capacitors at it again
Last night we had a power outage [ long drawn out trying three to come back up before going out completely ] and when I went to turn the DVR camera recorder back today no go 3 bad capacitors ( one capacitor no ESR reading on DVR board the other 3 capacitor on the power supply board over 40 ohm this is not a misprint ) on the external switching power supply and one capacitor on the DVR camera recorder board where the power supply that goes to the hard drive disk is
Well at least I have the cameras back on line I to try the... -
Hi everyone,
Yes ! How does this switching PS works ? :-)
I understand (not in deep, of course) the switching PS principle; typically, I'd expect to get a VCC just to "feed up" the STR or the Switching regulator, but I cannot figure how this VCC is "created" (on a TV switching PSU, I often see some cascaded resistors, but here, I believe that one of the transformer input should make the permanent VCC, but I cannot figure where )
Thanks for your help. I already wrote some explanation of what I was having and did some measurements here ...
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