In this post I'll fix a Dell n5110 laptop that beeps on start-up but nothing comes on laptop display screen. This post will also help you to fix the same problem other Dell laptops.
The beeps that come on start up that is a POST error generated by the BIOS.
I download this table form the Dell support site in this table dell defined the cause for problem as the number of beep codes.
|POST Beep Codes|
|Beep Codes||Error||Probable Causes|
|1||Memory refresh failure.||Defective system board.|
|2||Error occurred in first 64 KB of main memory.||Faulty DIMM or defective system board.|
|3||Read or write error occurred in first 64 KB of main memory.||Faulty DIMM.|
|4||Timer on system board malfunctioned.||Defective system board.|
|5||Microprocessor error.||Defective microprocesor.|
|6||Gate A20 failure.||Defective system board.|
|7||Microprocessor-execption interrupt error.||Defective microprocessor.|
|8||Video memory read/write error.||Missing or faulty video adapter.|
|9||ROM checksum value does not match value encoded in system BIOS.||Corrupted system BIOS program or defective system BIOS chip.|
|10||NVRAM shutdown register read/write error.||Defective system board.|
|11||Cache memory error.||Defective microprocessor or cache card.|
|1-2||Video adapter failure.||Faulty video adapter.|
|1-3||No monitor connected.||Loose video cable connection or defective video cable.|
Faulty video adapter.
In the first video you can see the as I turn on the Dell Inspiron n5110 laptop it's star beeps, 8 beeps but nothing appear on display screen.
In the second video i connect an CRT monitor for external display and in this monitor display comes okay.
Remove the laptop top cover assembly you will get an access to the laptop display connector and unplug the display connector and re-install it again. In the last video you can see it's work for me the display coming on the laptop screen and no any beep error appear.
Now I write something for those who are facing the problem but didn't got success to fix this fault.
Because not only this display cable loses connection is responsible to that malfunctioning of laptop. There is some other things malfunctioning can be responsible to the same error.
- LED/LCD (due faulty or broken screen).
- Display cable/Video cable (due to broken or shorted cable).
- system board (broken display header or jack, faulty graphic card/chip or video ram).
But the external monitor also not shows any display then definitely it's a system boaerd problem and it's mostly happens due to graphic chip malfunctioning, need to replace, re-ball or reflow the chip using the BGA rework station.
Thanks and have a good luck