hi, I have this Lenovo ideapad 330S-15ARR laptop that was not working, black screen and fan spinning. I made a backup of current corrupted bios (attached file) and then flashed the bios file from second post and now it is working, is it possible to have the corrected bios files with missing infos?
model 330S-15ARR
model name 81FB
mfg date 19/03/27
factory id JVHFC1
MO PF9XB9327016
MTM 81FB008MIX
S/N PF1NESRY
thanks in advance...
vpower
Senior Member
Last Activity: Today, 04:17 AM
Joined: 09-25-2022
Location: milan
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once I cleared the short (solder blob), PL101 is no longer shorted (or low resistance). of course the contact on the right is shorted.. PIN 2 of PJP103 is shorted or very low resistance. I'll keep searching....
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I confirm, it is a solder blob. I cleared it with braid and measured, left side is open circuit, right side is 2 ohm...
Last edited by vpower; 11-25-2024, 12:11 PM.Leave a comment:
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[QUOTE=mon2;n3514037]Flux and carefully remove UA1 - audio codec off the board. Test again without this audio codec off the board. Be sure that there are no shorted smd pads on the PCB after this part is removed.
UA1 removed, still same issue. I noticed lower current drain (1,5A instead of 2A) , still heatspots on PU601 and PU102[QUOTE=mon2;n3514037]Flux and carefully remove UA1 - audio codec off the board. Test again without this audio codec off the board. Be sure that there are no shorted smd pads on the PCB after this part is removed.
UA1 removed, still same issue.Leave a comment:
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I'll try and let you know.
Maybe it is useful infomation...: when I check PU102 in diode mode both PIN2 LX_5V and PIN8 +5V_ALWP sound like shorted to ground and 6 ohm to ground in resistance mode...Leave a comment:
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is there a jumper I can use to disable the discrete GPU? please explain... thanks in advance...Leave a comment:
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done already, no corrosion found but I'll check again...Leave a comment:
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Dell Latitude 5420 no power
Hi, I have this laptop that suddenly died. Motherboard is GDF40 LA-491P REV:2.0
I found the schematic here: [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3318341-dell-latitude-5420-la-k491p-rev-0-3-boardview[/url]
When I connect the type-c charger with a meter, no battery connected, I see only 5v and 2 amps current draw and these components quickly get very hot under thermal camera: UA1, PU601 and PU102
Any suggestion?Hi, I have this laptop that suddenly died. -
I've just tested with different ram sticks .. it booted correctly to windows login, than black screen again. And now still same problem.. fans spinning for three seconds, keyboard lit and nothing else. I think that maybe bios programming would not be useful with intermittent boots..but I could try.Leave a comment:
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Acer Nitro 5 model N20C2 board LA-K862P black screen
I have this laptop: charging light is on when connected to the charger, when I push the power button you can hear the fans spinning for a three seconds, the keyboard backlight it turning on, the caps lock key is unresponsive, no image on screen. Only a couple of times it booted with image for a few seconds and then reboots to black screen. When it is frozen with black screen and lit keyboard, I can keep pressed the power button to shut it completely.
I downloaded schematics in this forum ( [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/93861-predator-helios-300-la-k862p-schematic[/url]... -
update: after removing the U40 part,no more low resistance on PL5. So I ordered and replaced it, the laptop is still dead but I can see that PU3 (ISL95905) is getting hot.
do you think I should replace it? it's a BGA part and not so cheap, so I'm not sure about the job...Leave a comment:
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I removed the part. now all pins are open except for pin5 which is ground. I was thinking about making a bridge on pin 1 and 6 .. what do you think? I read about it here:
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/59503-lenovo-yoga-unidentified-component[/url]https://I removed the part. now all ...hooting-hardwaLeave a comment:
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pin 1 4.6 ohm
pin 2 5.2 ohm
pin 3 open
pin 4 open
pin 5 2.5 ohm
pin 6 4.6 ohmLeave a comment:
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looking at schematics, component name is TPS2553DRV_SON6_2X2...Leave a comment:
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do you think I need to replace it?Leave a comment:
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U40 in attached photo.
cannot find 2R2. U40 is heating up...Leave a comment:
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Lenovo Yoga 3 PRO 1370 no power
Hi, I have this dead laptop, no power and no charging light.
Power voltage seems ok, I have 19v on CLR. I tested a few coils, and I found a short near battery connector, on PL5.
I injected 1v and I noticed a component named U40 getting hot. This is what I get with multimeter on that part with diode mode:
pin 1 VUSB shorted
pin 2 N25415288 shorted
pin 6 +5VDX_WALKPORT shorted
I attached photos of shorted (?) coil and component getting hot
any hint? thanks in advance... -
Asus VivoBook 15 model F512D white screen
I have this laptop showing white screen as soon as I push the power button, it is booting the operating system because I can hear the windows 11 intro sound. If I connect an external LCD with HDMI cable there is no image. Is it possible to hardware disable the AMD gpu in any way? Or any hint?
Thanks in advance -
problem solved! I checked with multimeter, and I found shorted PWR_CHG_VBATIN. I injected 2 volts and found capacitor PC4428 shorted, near the battery connector so I removed it. I have a question.. do you think I need to replace it? I read SC10U25V3MX-5-GP in the schematics.
thanks for helpingLeave a comment:
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