Dell N5040 Screen freezes and then goes white slowly

Question

I have an inspiron 15R model N5040. Recently, I start to experience a recurring issue where the LCD screen freezes and then goes white. I move up/down the screen, and the image comes back OK, unfrozen. The problem would reoccur few minutes after,over and over. These are the steps I took so far: 1- Ran diagnostics (using F12 key at boot time) Full diagnostics passed OK,problem still occur during tests 2- Ran Windows 7 in safe mode, problem still shows up 3- Update BIOS from A02 to A05, no change 4- Open laptop to check/reseat LCD connector, no change 5- Validate that problem would also occur when not in Wondows by going in setup mode (F2key at boot time), problem still there. When I plug a second monitor, problem would still occur on laptop LCD, but never on the external monitor. Any ideas what to look for? Warranty has expired. Tx

GPdM · Accepted Answer

HI Rajath, I finally replaced the LCD screen, and my problem is now resolved. Tx for your hints GPdM

DELL-Rajath N · Answer

Hi GPdM,

I appreciate your efforts to fix the issue with the LCD screen. I suggest you to clean the air vents with a can of compressed air as the heat generated due to the air vent blockage may cause this. You will need to replace the LCD kit if the issue occurs after cleaning the air vents.

Please let me know if you need further assistance.

GPdM · Answer

Tx Rajath,

I cleaned the air vents, but problem still occured. I reran some diagnostics (F12 key) and I was wondering what would be typical/nominal values for CPU and Video thermistors. In the shown values, they ranges from 16 C to 60+ C.

Could it help to resolve issue by replacing the thermal pads / compound and get more heat dissipation?

Regards.

GPdM

DELL-Rajath N · Answer

Hi GPdM,

Thank you for your reply and for providing an update on the status. Replacing thermal pads/compound may help to resolve this issue. However, I suggest you to run the LCD Built-In Self-Test by following the steps provided below:

1. Shutdown the laptop.
2. Press and hold the “D” key and then press the Power button.
3. Release them when you see color bands on the screen.

Please let me know about your findings.

Locked Topics – Laptops General

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