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,
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... -
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...03-11-2025, 06:55 PM -
I have this 10 amp 0 to 30 volt switching power supply that decided to have a 630 milliamperes draw on it at 0 volts
I open it up to find non brands name capacitors in it
I am not sure how this switching power supply is set up
Could someone please explain how this power supply works
Here is the capacitor ESR results
(1) 47uf@50 volts 0.46
(2) 47uf@50 volts 0.45
New 47uf@50 volts 0.35
(1) 100uf@25 volts 0.34
(2) 100uf@25 volts 0.35
New 120uf@50 volts 0.08
(1) 220@25 volts 0.13... -
The primary voltage is 480 single phase the second voltage needed is 60 volts
Now it could be 30 volts 0 volts 30 volts preferred
Or it could be 60 volts 0 volts 60 volts and just use one side of
Output amp need to be at least 30
Dose anyone know where I can find one
This is what is the device I am working on
The problem with this one is that it is over heating and smelling like it is over heating
When it has a load on it...
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