Re: Dmtech lm37xty lcd
no it was a hair lol i did remove it lol
no it was a hair lol i did remove it lol
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Re: Dmtech lm37xty lcd
ok i noticed some burning under a fet the big solder joint in the middle
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Re: Dmtech lm37xty lcd
Hi there did you get this fixed? What was the fault.
Cheers
AidsoComment
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Re: Dmtech lm37xty lcd
Sounds like the fault lies on the Main A/V board, no 'Power On' signal.
Check some of the voltages on the various regulators on the Main A/V bd.Comment
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Re: Dmtech lm37xty lcd
Update: on the board, found a new board but don't have the cash to buy at moComment
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Re: Dmtech lm37xty lcd
ok got the cash, bought/replaced and it works a treat
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Hi everyone.
I am diagnosing my personal laptop, because it wont power on and no leds light up.
At the dc-in there are 8 pins, 1 and 2 shows healthy 19.66 volts. The next three are ground, but the 6th one shows .283 volts. This is strange to me, it should be 3.3 or 5 or aome volts not 0.283v. As I am new to this, I would like some guidance. Please someone advise me on what to check next.
Oh the boardview and schematics I am using is for a similar model as I cannot find the proper one anywhere. Quanta DA0P5HMB8F1 rev F. Nowhere on the internet.09-23-2025, 12:13 PM -
Hi everyone,
Brought a non functionnal PS5. Apparently only a bad PSU...
No beep, nothing.
After some tests i found this :
- PSU is fine (12 volts stable)
- 12 volts line is shorted
- DA9065 was fried, F7003 also => Replaced both of them, short is gone on 12 volts line, no dead short anywhere else.
- By the way, nothing change. No signal, no power, no beep.
Mesuring all rails with my workbench psu (12 volts input)
- 0.00 amp drawing
- 12 volts, 5 volts, 2 volts, 1,15 volts are presents (suppose new DA9065 do is... -
Good day to all. The bite alarm drains 9-volt Krona batteries. Current consumption when switched on is about 50 mA. I wiped the board from oxides, I will attach a photo (on the board there is a j3y transistor and a 7533 stabilizer, the microcircuit is erased = (the 3.3-volt stabilizer heats up weakly. I replaced it, nothing changed. I unsoldered the microcircuit, the consumption disappeared. The resistance on the pins of the unsoldered microcircuit from the point clockwise is more than 2 megaohms, the 11th leg is presumably ground. I warmed up the microcircuit, the consumption does not change....
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Hello,
Dell Latitude 5420 P137G
Board: LA-K491P REV A01
I have received this laptop which was described as "does not power on or accept charge." Battery shows no sign of charging when charger is plugged in, nor does the board show any signs of life when battery is unplugged and charger is plugged in. No light from the LED at all or any other indications of activity.
Board seems to have no shorts, all power rails are fine and show high resistance.
When charger is plugged in, voltage is present in 3.3V rail but absent in others.... -
Hi, I would like to share my experience...
So, I came across with common problem - no 50V on PSU 40-PF0750-PWD1G
L6566B was burned. Between pin 7 and GND were short circuit. I replaced L6566B with a new one, but it gave me nothing. However, it started if I touched pin 16 with multimeter probe. Obviously the protection is triggered.
If we look at the L6566B datasheet, we will see that to deactivate the protection (AC_OK), is enough to exceed 0.450 volts.
In my case, I have had 0.632 volts. This is enough at the first glance. But on the oscillogram on pin 16, I observed noise...
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