I have Lenovo legion 5 2020 model, i5 10300h, GTX 1650ti
The problem is it doesn’t boot when connected to charger, when connected to charger and i press power button the power light on the key lights up but no display, no fan spinning.
Then if I **remove the charger it boots on battery **and works normal for 15 to 30 mins then it freezes no response I have to hard reset by holding the power button.
I went to repair shop and they told me they have to replace the motherboard and it may take a month or two to get replacement and also the price is high they said it may take minimum 30k, I don’t want to spend that much so
is there any way to repair it or it is only worth for scrap or can I sell it as whole or as parts
have you tried basic stuff like remounting RAM and SSD, could be because of this.
How much is the battery health?
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I reinstalled windows, updated gpu and all drivers, reconnected battery, swapped ram tried running on one slot, borrowed friend’s SSD and tried booting windows, all ended in vain.
Battery health is 60wh battery by design but currently holding 50wh as reported by hwinfo
I would try more shops. It won’t cost that much. He may be quoting 30k for board replacement and not repair.
It could be a simple fix or may need a core reflow.
Try disabling dedicated GPU. And only use with iGPU (since system boots with battery). (I think shops with DSO machine are more experienced )
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This 2020 legion don’t have option to disable dedicated graphics and use integrated graphics but can disable integrated and run only on dedicated using mux switch and i tried this too but it freezes,
I gave laptop to Lenovo service center in coimbatore they told to replace the motherboard so I gave to my frnd he took it to chennai Lenovo service center there they took a week and told the same,
I am 100km away from any city so can’t able to find any good repair shop.
I think its a bios problem maybe reflash the bios?
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Does the charging light blink orange?
Try reseating the CMOS cell?
You are showing it to persons who are not experts in repair, only replace.
Take to a proper repair shop which is trusted. Preferably in metros. Check, double check that they know what they are doing.
Here in Mumbai, the idiots took to some place in Andheri which screwed up the laptops - an MSI GL63 and Thinkpad E14. Full write off.
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Yes I tried it but for updating bios need to connect it to charger but then it freezes so cannot update
Is there any website or guide to find genuine repair shop, I am afraid they might change original parts
Ask around. No way about this.
Your issue seems to be related to power managment voltages, so related to the PMIC mostly.
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Guys don’t bully me but I think taking help from chatgpt might do some good here so here’s the result.
Thanks for laying out the issue clearly — that’s helpful. Based on what you described with your Lenovo Legion 5 (2020) — specifically:
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No boot when connected to the charger.
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System boots only on battery, but freezes after 15–30 minutes.
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Power light turns on, but no display or fan when plugged in.
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Works briefly, then requires a hard reset.
These symptoms suggest a hardware-level power issue or something on the motherboard, power circuitry, or charging system. Let’s break down the potential causes:
[HR][/HR]
[HEADING=2] Likely Hardware Issues[/HEADING]
[HEADING=3]1. [/HEADING]
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If your charger or charging port (DC jack) has a short or sends unstable current, it could prevent the laptop from powering on.
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Try using a different compatible Lenovo charger (same voltage/wattage) to rule this out.
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The charging IC (Integrated Circuit) on the motherboard could be damaged, failing to route power correctly when the adapter is connected.
[HEADING=3]2. [/HEADING]
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These are responsible for switching between battery and AC power. A damaged MOSFET could cause weird behavior when switching sources, especially during startup.
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These often cause symptoms like no fan spin, no display, but lights come on — exactly what you’re seeing.
[HEADING=3]3.[/HEADING]
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A shorted component (like a capacitor or IC) can prevent full power-on, but might still let enough power through for indicator lights.
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When on battery, the system might partially function, but the short or instability eventually crashes the system.
[HEADING=3]4. [/HEADING]
- Could be overheating (fan not running?), thermal throttling, or power draw not being met by the battery alone due to worn battery cells or VRM instability.
[HR][/HR]
[HEADING=2]Troubleshooting Steps You Can Try[/HEADING]
- Reset BIOS / CMOS:
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Remove the battery (if accessible), unplug charger.
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Hold the power button for 30 seconds.
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Optional: Open the back and remove the CMOS battery for 5 minutes.
[*]Test Without Battery (AC Only Boot):
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Remove the battery.
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Plug in charger only, and see if it powers on.
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If it still doesn’t boot — more evidence of charging circuit or board-level issue.
[*]Use an Alternate Charger (Same Wattage):
- Rule out the possibility that your current charger is delivering faulty power.
[*]Thermal Paste & Fan Check:
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If you can open it up, check whether the fans spin freely and clean any dust.
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Look at the heatsink contact — overheating can cause crashes.
[*]Check Battery Health:
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Use tools like Lenovo Vantage or HWMonitor (if it stays on long enough).
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If the battery is swollen or degraded, it could also cause instability.
[HR][/HR]
[HEADING=2] Most Likely Cause (Based on Your Symptoms)[/HEADING]
This could require board-level repair, such as:
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Replacing power MOSFETs
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Reflow/reballing charging IC
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Replacing the DC jack if shorted
[HEADING=2] Recommendation[/HEADING]
If you’re not comfortable with board-level diagnostics:
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Take it to a trusted laptop repair shop or Lenovo service center, and describe exactly what you told me.
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Ask them to check the power circuitry and charging ICs, not just do a reinstall or battery swap.
I think there are multiple issues here in play, like short circuit, battery related issue and/or thermal throttling. If you are able to open the laptop and do a thermal paste change then do so. Your laptop might be overheating (apart from other issues). Try using power charger without battery installed (this is bypass power first being fed into the battery and if there is a short circuit there it will bypass that). Also try whatever else you can try. If nothing works then I’d say to keep trying different repair shops, maybe someone can actually fix it for cheaper. It’s most probably fixable since laptop is at least able to run for 10-15 mins.
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I tried removing battery and running directly on battery still it didn’t boot and I have already tried with another charger in Lenovo service center still it didn’t boot and as of temps it is hovering 45 to 50 c so not thermal throttling
Why someone going to bully for using chatgpt I used it for troubleshooting windows many times
Welp that sucks. I hoped for an easy diagnose fix.
The info it provides isn’t really reliable. It’s a hit or miss.
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How much they quoted for repair??
I also have Lenovo gaming laptop for repair and quoting 15k for basic repair is normal now
No need to bully you, but chatgpt is not a magical solution for everything.
If you are from Mumbai - give them and check. PC Clinic Ghatkopar is the one I use. The owner is not here for 2 months, so dont expect high level fixes to go through.
They told it take approximately 30k to get motherboard replacement and takes 2 months to arrive motherboard after ordering from lenovo.
What problem do you have with laptop
Hey,
I hope you manage to get your laptop fixed. If not, here’s a thought: the problem you described, where there’s no display only when it’s on AC power, seems quite rare. I don’t think it’s a BIOS-related issue. If the BIOS were corrupt, it would affect the laptop on both battery and AC power; a BIOS issue wouldn’t just occur on AC power and then resolve itself on battery.
I had a similar experience with my Legion Y540, which used to get no display on either power source. Lenovo quoted me ₹45,000 for a motherboard replacement. I was shocked—I could get a brand-new laptop for that kind of money!
So, that’s what I did. I bought a new IdeaPad Gaming for ₹44,000, which was on offer. In terms of processing and graphics power, it was actually a big upgrade (Ryzen 5 5500 & RTX 2050) from my old laptop (i5-9300H & GTX 1650). I had bought the Legion in 2019 for around ₹70,000, which was a huge amount for me. After it broke, I lost faith in expensive laptops. My thinking is, if any laptop can break, what’s the point of spending so much on one?
The IdeaPad I have now is much better value for money compared to the Legion. I stopped focusing on “show-off” laptops and started focusing on the value a device can add to my life. My cheaper laptop runs Android Studio perfectly fine for app development, so what’s the point of paying a premium for an expensive machine that could just break and add no real value?
Honestly, I have gotten so much more out of this new laptop. After my first one broke, I became incredibly focused on my projects and work. I was literally coding for 11-12 hours a day and finished a huge project I had been working on for six months. It’s a much better feeling now because I feel like I’ve squeezed so much more value and productivity out of this laptop.
3 Likes
You just said what I had in mind, now my 70k laptop is just paperweight, don’t know what to do with it, took it more than 10 service centers no use, regretting on making the purchase
This seems like a motherboard issue. Something like this happened with my ThinkPad T470 while it was still under warranty and they replaced the motherboard. Even after the replacement the problem reoccurred. Then they replaced it once again. Then on it has been working without any issues. It’s been over 6 years now and no issues.
So, looks like service centre is your best bet. Look for some service center which has “Chip level repair” mentioned. They’re the ones who will work on soldering those solid state chips, capacitors, resistors etc. on the motherboard. They’ll have the equipment to magnify and do this level of repair. It could turn out to be a simple blown fuse kind of an issue. Or it could be unrepairable. I wouldn’t just dump the laptop until I’ve tried taking it to any such reliable place. Though I don’t have any such experience to talk from.
There are many such places I see on Google maps here in Bangalore with great reviews, especially the ones on SP road. Perhaps you can find some such in Coimbatore as well. Try the major computer repair area in Coimbatore. You’ll have better luck there than going to any individual service centers since you can hop to different shops and check if one says they can’t fix.
Keep us posted in this thread on what you finally did and if the issue gets resolved then what was the diagnosis and resolution. Good luck!
Mostly i gave up but I will keep looking here if i went to Chennai or Bangalore someday will try there