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Version actuelle par : jayeff ,

Texte:

Hi @humaneengineer ,
 
Try shining a torch at an angle close to the screen to check if you can see an image at all when the laptop is turned on.
 
''If you can see an image'' you have a backlight problem. This may be in the systemboard, (backlight power supplysupply circuit), the eDP cable (damaged where it passes through the hinges to get from the systemboard to the screen or loose connection at either end) or the LCD unit (faulty backlight circuit)
''If you can see an image'' you have a backlight problem. This may be in the systemboard, (backlight power supplysupply circuit), the eDP cable (damaged where it passes through the hinges to get from the systemboard to the screen or loose connection at either end) or the LCD unit (faulty backlight circuit)
 
Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard / lower case masking the location of the actual problem.
 
''If you cannot detect an image'' then try connecting an external monitor to the laptop to check if its’ display stays on OK when you flex the laptop’s screen.
 
Even a TV can be used as an external monitor as long as you have a HDMI cable with suitable connectors at each end.
 
If the problem is with the LCD screen (or possibly the eDP cable or its‘ connection to the screen or systemboard) then here’s a link to the [https://download.lenovo.com/consumer/mobiles_pub/flex_5-1470_5-1570_hmm_201703.pdf|service manual] for the laptop.
 
Scroll to p.52 to view the necessary pre-requisite steps and then the procedure to remove the LCD unit. Initially this will help to gain access so that you can check the eDP cable connection to the systemboard before having to remove the LCD unit
 
If you determine that the problem is either a faulty LCD module or even a faulty eDP cable, on p.74 of the manual you’ll find the part numbers (FRU number) for the LCD unit - Item #2 and the eDP cable -item #5.
 
If you search online using the part number ''only'' in the search box of your browser, you’ll get results for suppliers of the parts.
 
Usually the part number is printed on the back of a LCD panel if you wish to verify that you are looking for the correct part. Not sure if it is also printed on the eDP cable or not, hopefully it is.

Statut:

open

Modifié par : jayeff ,

Texte:

Hi @humaneengineer ,
 
Try shining a torch at an angle close to the screen to check if you can see an image at all when the laptop is turned on.
 
''If you can see an image'' you have a backlight problem. This may be in the systemboard, (backlight power supply), the eDP cable (damaged where it passes through the hinges to get from the systemboard to the screen or loose connection at either end) or the LCD unit.unit (faulty backlight circuit)
''If you can see an image'' you have a backlight problem. This may be in the systemboard, (backlight power supply), the eDP cable (damaged where it passes through the hinges to get from the systemboard to the screen or loose connection at either end) or the LCD unit.unit (faulty backlight circuit)
 
Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard / lower case masking the location of the actual problem.
Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard / lower case masking the location of the actual problem.
 
''If you cannot detect an image'' then try connecting an external monitor to the laptop to check if its’ display stays on OK when you flex the laptop’s screen. Hopefully this will verify that it is a problem related to the LCD screen or its’ connection to the systemboard and that it is not a systemboard problem.
''If you cannot detect an image'' then try connecting an external monitor to the laptop to check if its’ display stays on OK when you flex the laptop’s screen. Hopefully this will verify that it is a problem related to the LCD screen or its’ connection to the systemboard and that it is not a systemboard problem.
 
Even a TV can be used as an external monitor as long as you have a HDMI cable with suitable connectors at each end.
 
If the problem is with the LCD screen (or possibly the eDP cable or its‘ connection to the screen or systemboard) then here’s a link to the [https://download.lenovo.com/consumer/mobiles_pub/flex_5-1470_5-1570_hmm_201703.pdf|service manual] for the laptop.
 
Scroll to p.52 to view the necessary pre-requisite steps and then the procedure to remove the LCD unit. Initially this will help to gain access so that you can check the eDP cable connection to the systemboard before having to remove the LCD unit
 
If you determine that the problem is either a faulty LCD module or even a faulty eDP cable, on p.74 of the manual you’ll find the part numbers (FRU number) for the LCD unit - Item #2 and the eDP cable -item #5.
 
If you search online using the part number ''only'' in the search box of your browser, you’ll get results for suppliers of the parts.
 
Usually the part number is printed on the back of a LCD panel if you wish to verify that you are looking for the correct part. Not sure if it is also printed on the eDP cable or not, hopefully it is.

Statut:

open

Modifié par : jayeff ,

Texte:

Hi @humaneengineer ,
 
Try shining a torch at an angle close to the screen to check if you can see an image at all when the laptop is turned on.
 
''If you can see an image'' you have a backlight problem. This may be in the systemboard, the eDP cable or the LCD unit.
 
Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard / lower case masking the location of the problem.
Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard / lower case masking the location of the problem.
 
''If you cannot detect an image'' then try connecting an external monitor to the laptop to check if its’ display stays on OK when you flex the laptop’s screen. Hopefully this will verify that it is a problem related to the LCD screen or its’ connection to the systemboard and that it is not a systemboard problem.
 
Even a TV can be used as an external monitor as long as you have a HDMI cable with suitable connectors at each end.
 
If the problem is with the LCD screen (or possibly the eDP cable or its‘ connection to the screen or systemboard) then here’s a link to the [https://download.lenovo.com/consumer/mobiles_pub/flex_5-1470_5-1570_hmm_201703.pdf|service manual] for the laptop.
 
Scroll to p.52 to view the necessary pre-requisite steps and then the procedure to remove the LCD unit. Initially this will help to gain access so that you can check the eDP cable connection to the systemboard before having to remove the LCD unit
 
If you determine that the problem is either a faulty LCD module or even a faulty eDP cable, on p.74 of the manual you’ll find the part numbers (FRU number) for the LCD unit - Item #2 and the eDP cable -item #5.
 
If you search online using the part number ''only'' in the search box of your browser, you’ll get results for suppliers of the parts.
 
Usually the part number is printed on the back of a LCD panel if you wish to verify that you are looking for the correct part. Not sure if it is also printed on the eDP cable or not, hopefully it is.

Statut:

open

Message d'origine par : jayeff ,

Texte:

Hi @humaneengineer ,

Try shining a torch at an angle close to the screen to check if you can see an image at all when the laptop is turned on.

''If you can see an image'' you have a backlight problem. This may be in the systemboard, the eDP cable or the LCD unit.

Hopefully it is not in the systemboard. Flexing the screen before ''may'' have caused movement in the systemboard masking the location of the problem.

''If you cannot detect an image'' then try connecting an external monitor to the laptop to check if its’ display stays on OK when you flex the laptop’s screen. Hopefully this will verify that it is a problem related to the LCD screen or its’ connection to the systemboard  and that it is not a systemboard problem.

Even a TV can be used as an external monitor as long as you have a HDMI cable with suitable connectors at each end.

If the problem is with the LCD screen (or possibly the eDP cable or its‘ connection to the screen or systemboard) then here’s a link to the [https://download.lenovo.com/consumer/mobiles_pub/flex_5-1470_5-1570_hmm_201703.pdf|service manual] for the laptop.

Scroll to p.52 to view the necessary pre-requisite steps and then the procedure to remove the LCD unit. Initially this will help to gain access so that you can check the eDP cable connection to the systemboard before having to remove the LCD unit

If you determine that the problem is either a faulty LCD module or even a faulty eDP cable, on p.74 of the manual you’ll find the part numbers (FRU number) for the LCD unit - Item #2 and the eDP cable -item #5.

If you search online using the part number ''only'' in the search box of your browser, you’ll get results for suppliers of the parts.

Usually the part number is printed on the back of a LCD panel if you wish to verify that you are looking for the correct part. Not sure if it is also printed on the eDP cable or not, hopefully it is.

Statut:

open