Re: ACER SF315-52 working but no lid display.
Thanks mon2, will post results when injection completed.
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Re: ACER SF315-52 working but no lid display.
Any help appreciated with the above?
I just don't want to kill the PCH or something by injecting too much power?
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Re: ACER SF315-52 working but no lid display.
according to schematic, G5244T11U is a 120m ohm high side distribution switch
can anyone advise what the resistance stated refers too and how it might relate to pins 1 and 5 measured resistance on the switch i removed?..
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Re: ACER SF315-52 working but no lid display.
The u4501 5 pin load switch has 5244W written on the top, would be interesting to know if the 97ohm reading between pins 1 and 5 is indeed low for this switch?
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Re: ACER SF315-52 working but no lid display.
With u9101 removed, 3vs is still 10 ohm.
I'm not sure how to proceed to find the source fault.....power injection?
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Re: ACER SF315-52 working but no lid display.
For my own curiosity and relative ease, I've taken off the load switch U4501. to check if pin 5 trace was effected and unfortunately 3vs trace to gnd is still 10ohm.
U4501 pin 1 trace now appears open circuit in diode mode.
The u4501 switch removed and measuring resistance across its pins 1 and pin 5 in the off state...shows 97ohm....
Time to remove u9101......
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Re: ACER SF315-52 working but no lid display.
Strangely U4501. pin 5 remains at 3.2v when enabled, could the low resistance on 3vs be due to this switch?
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Re: ACER SF315-52 working but no lid display.
pin #8/9. = 9.7 ohm
pin6/7 = 1k ohm
Although resistance appears very very low, how is 3v being maintained assuming a short?
Thanks Mon2
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Re: ACER SF315-52 working but no lid display.
Thanks for response. I will check this out
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Re: ACER SF315-52 working but no lid display.
Thanks I will remove the components mentioned and get back to you.
The slim screen original to the unit (which is cracked) will display on a test laptop.
The replacement screen is a standard 30 pin FHD similar to the one removed.
FYI - Pin 5 - 3vs reads 10ohm, but voltage is correctish at 3.2v ?
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Re: ACER SF315-52 working but no lid display.
Thanks for reply Mon 2
200ohm range readings :-
screen attached 95.5ohm (96 on second reading)
screen disconnected 94.6 (94.5 on second reading)Last edited by coltron; 09-14-2023, 04:53 AM.
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ACER SF315-52 working but no lid display.
Hi hope someone can help with this acer sf315-52.
HDMI is working fine, but replacement laptop screen (slim type) won't initialise
schematic link below
At the [url]https://www.badcaps.net/forum/showthread.php?t=86039&highlight=SF315+52[/url]
Diagnostic so far:- (with known good screen connected)
volts on 5 pin U4501.
pin 5 has 3.2v
pin 1 has 2.6v
pin 4 has 2.6v
The screen cable bells out fine with good continuity
Sockets and connectors have been cleaned with contact...
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Re: LA-C421P BQ24780S no ACDRV
Just trawling my old laptop diagnosing posts and seen added posts since original board view request..i lost interest in the board after a couple of months of unsuccessful attempts.
one day i may dig out the L560 board and try the sw 1 top pins bridge [U]only[/U] suggestion by rbvdon..
board won't be worth much even if fixed, but hey, sometimes its about the challenge.
smd Flea, thanks for comment regarding mosfet bypass, At the time I watching to many early you tube videos (Sorin) showing mosfet bridging...
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Re: IDEAPAD NM-D031 MB with 10 second boot cycle
Update:
I've removed jumper pj406 5v alw...and the supply voltage is at 5.1v..
Something after the power supply jumper is pulling the voltage down.
I've attached board view and schematic for those with quicker skills than myself
Resistance of the remaining 5v circuit (excluding 5vps) is 496ohm.
I'm thinking of voltage injection, I've identified several regulators that the 5v goas to as well as the usb ports. but would something dropping 0.8v heat up?
...Last edited by Vesko356; 08-02-2023, 03:32 AM. Reason: Attached schematic and BV removed and replaced with link.
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IDEAPAD NM-D031 MB with 10 second boot cycle
Hi got a recent liquid damaged Ideapad 3 with tenth gen i5 has the DO31 MB. I've done some work but its stumping me.
mb has been alcohol cleaned and button board replaced where most of the liquid went...( a little on keyboard flax connector but cleaned up well.
Main Problem:-
The laptop starts and switches off in repeating 10 second cycles.?
No fan starting.
Their are no obvious signs of damage and pl's and caps have been checked for direct shorts?
Battery charges fine.
I've measured resistance and...
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Re: dell e5550 not posting
dramst fine, I've got another board rather than chase the fault, but put to one side for a Rainey day....thanks mcpisig123...i think i will wait till i have a few boards and do a few bios dumps in one day
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Re: dell e5550 not posting
Thanks mcplslg.
Assuming dramst not present, is the laptop toast?
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dell e5550 not posting
Hi, hope someone can help diagnose a dell E5550,
Mobo LA - A911P Rev 1
which refuses to post.
When received, the laptop powered on, but gave a light code indicating ram issue. The ram and slot were cleaned, then ram re-seated.
Now laptop powers on with no error codes or beeps, but wont display to lcd or hdmi.
When a usb win10 installation stick is present at boot, there is no sign of power or communication with it.
I have the board out and have inspected components for obvious damage/liquid ingress but...
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Re: Thinkpad L480 , Short To Ground, CPU gets Hot
I have an hp 250 g5 with a similar 3v short issue. The PCH die next to the cpu gets warm, when I cleaned the grease off, using my magnifying glass I could see a small gritty looking crator in the mirror finish of the chip.
There are capacitors underneath the chip on the other side of the board, and undeterred removed every shorted cap i could find, but the caps i removed all tested good.
Freezer spray would of been a quicker diagnostic tool, every days a school day.
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