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Old 05-25-2022, 06:37 AM   #1
zen
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Default Lenovo T470 ,no backlights advice.

Hi all

Laptops not really my thing , but here we go .

Can take signal out to a monitor & display present .

Also can see a very faint image on the laptop display .

Customer has already replaced entire display , thinking backlights had failed , but that doesn't seem to be the case .

Hoping for a protection fuse ,but could potentially be the inverter drive circuitry .

Anyone experienced on these ?
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File Type: jpg Lenovo T470.jpg (682.3 KB, 4 views)
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Old 05-25-2022, 06:43 AM   #2
SMDFlea
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Default Re: Lenovo T470 ,no backlights advice.

Find the motherboard part number and look for the schematic on the forum,look for the fuses at the LVDS connector.Did the full display have another LVDS cable
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Old 05-25-2022, 07:00 AM   #3
zen
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Default Re: Lenovo T470 ,no backlights advice.

Thanks , will do .

Not sure on the LVDS cable . Need to speak with customer .
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Old 05-26-2022, 09:34 AM   #4
zen
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Default Re: Lenovo T470 ,no backlights advice.

Hello again

What number am i looking for ?

Please see attachments .
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File Type: jpg Main board.jpg (1.05 MB, 14 views)
File Type: jpg PCB part number.jpg (1.12 MB, 11 views)
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Old 05-27-2022, 04:31 AM   #5
zen
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Default Re: Lenovo T470 ,no backlights advice.

3 amp fuse marked P o/c
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Old 05-27-2022, 06:03 AM   #6
zen
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Default Re: Lenovo T470 ,no backlights advice.

Well fuse replaced , but still no backlights .

Just trying to work out a point i can check supply from , now that board fitted back .
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Old 05-27-2022, 06:28 AM   #7
JaroTech
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Default Re: Lenovo T470 ,no backlights advice.

Hi, what voltage do you have on pin 23 of your LCD connector?
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Old 05-30-2022, 03:14 AM   #8
zen
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Default Re: Lenovo T470 ,no backlights advice.

Hi , will check , but looks like i'm now having different issue .

Seems to be cycling , as the fan start / stops .

Not sure what's going on with this unit.
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