Re: Shorted diode, help to identify it
Hi everyone
So... I found in some monitor scrap-power board a diode that looked exactly the same, and that tested good when I removed it. (flow in one direction, not in reverse)
I put in the laptop board and there wasn't any short-circuit. Then I ensemble everything, connect to DC adapter and there was a slight "click" sound.
No power-up at all, and now the laptop board is again in short-circuit. I have done again the "method" to locate the cause of the short (bench power supply and...
Ilyushin
Member
Last Activity: 05-14-2021, 08:46 AM
Joined: 06-23-2014
Location: Santander
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Re: Shorted diode, help to identify it
thanks everyone for helping. So, can we conclude it's the zener atsio posted in #8?
#11 I'm afraid that's far above from my understanding...Leave a comment:
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Re: Shorted diode, help to identify it
thanks for your reply, but that link shows a Zener diode, and mine is not a Zener, based on the drawing of the pcb...Leave a comment:
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Re: Shorted diode, help to identify it
Yes, Anode goes to GND and Cathode goes to the +19v input through 2 "PL" that are inductors if i'm right.
Attached photo, where the red wire was soldered (for finding the short) is the +19 input...Leave a comment:
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Re: Shorted diode, help to identify it
Sorry if it wasn't well explained
The diode removed, shows 0 resistance no matter what direction. This is the same values measured when it was soldered, and what caused the short in the mainboard between the +19v input and gnd
Looking in the link provided by selldoor seems that it should be a zener? but the symbol in the pcb where it was soldered is the symbol of a simple diode, not a zener
Or could it be a switching one as that link says?Last edited by Ilyushin; 07-14-2014, 04:13 PM.Leave a comment:
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Shorted diode, help to identify it
Hi, I have this laptop and I need help to find with what to replace it
Packard Bell mit-drag-gt2
Motherboard Hannstar J MV-4 94V-0 0648
It was in short-circuit and I found that the cause was a shorted diode. I removed it and it has no resistance no matter what direction (anode to cathode or reverse)
With that diode removed, the board has no short-circuit.
I haven't found any schematic for this board, and in the PCB under the diode is printed its symbol, so it's not a zener (attached pic)
The diode only has a yellow...Last edited by Ilyushin; 07-14-2014, 02:47 PM. -
Re: New Members - please post your introductions here
Hi! I'm a spanish computer technician who is now learning more about electronics and hardware repairs, so I came here to improve myself
This forum has been a great information source for me, and surely it will be in the future
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