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Old 04-11-2020, 10:51 AM   #1
Conste
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Default Lenovo B50-50 Bios repair

Dear all,

I have an Lenovo B50-50 unit here which doesn't post. Everything seems fine, but no post.
I think it could be BIOS related.

I have tried 3 different BIOS from the web, but they didn't work, maybe because they are for ideapad 100 units?
Ideapad 100 und B50-50 share the same mainboard (NM-A681), but maybe have a different EC firmware so that B50-50 EC FW and ideapad 100 bios won't post.

I could not find any free bios for B50-50, so I upload my dump here, hope somebody can repair it.

Best regards,

Constantin
Attached Files
File Type: rar B50-50 NM-A681.rar (3.76 MB, 9 views)
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Old 04-11-2020, 12:38 PM   #2
Claudiomfa
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Default Re: Lenovo B50-50 Bios repair

try this file and report..

Bios and ec file
Attached Files
File Type: rar B50-50 NM-A681_bios_ec.rar (3.65 MB, 10 views)
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Old 04-11-2020, 01:36 PM   #3
Conste
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Default Re: Lenovo B50-50 Bios repair

Thanks, but still no picture over HDMI...

What else could I test? Could also be PCH or CPU failure?
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Old 04-11-2020, 02:08 PM   #4
Claudiomfa
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Default Re: Lenovo B50-50 Bios repair

With my bios the laptop power on?

hdmi out image problem i think it's not bios problem. Do you install all manufacture software?
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Old 04-11-2020, 03:42 PM   #5
Conste
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Default Re: Lenovo B50-50 Bios repair

Sorry, my explanation was mistakable..

Laptop powers on with ur Bios, but no screen over HDMI.
Also over eDP I don’t get a picture or backlight, so no post at all.

What could I measure?
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