Dell 2405FPW Monitor - Page 1
Forum section: electronics / repair

author: IntruderMan
author_rank: Newbie
timestamp: February 16, 2017, 01:35:54 pm
content: Hi all I'm new the forum, but I have a lcd monitor that powers on but no display,it has 5 inputs,when you plug a source into any of the inputs the back lights come on but no display, unplug it back lights go out,any help would be appreciated,also looked at all capacitors, no sign of leakage or puffed up.Sent from my SM-N900V using Tapatalk

author: cnqhdszq
author_rank: Regular Contributor
timestamp: February 16, 2017, 02:13:18 pm
content: check Voltage of the power supply board ,check all electrolytic capacitors ,I think the most reasons are use ESR meter or LCR to check out cap .

author: testian
author_rank: Regular Contributor
timestamp: February 16, 2017, 02:48:40 pm
content: So your backlight is working and the screen is dead. Not even the on screen display?Some values you can measure:https://www.eevblog.com/forum/repair/dell-2405fpw-psu/msg812579/#msg812579

author: The_Penguin
author_rank: Regular Contributor
timestamp: February 16, 2017, 03:07:16 pm
content: Definitely check the power supply outputs. Also, for backlights on but no video (especially if the screen is white)check the fuse on the Tcon board.

author: mzacharias
author_rank: Frequent Contributor
timestamp: February 16, 2017, 03:36:32 pm
content: Also check for any small surface-mounted fuses on the t-con board (board may be integrated with panel).

author: RayRay
author_rank: Frequent Contributor
timestamp: February 16, 2017, 04:06:49 pm
content: Quote from: IntruderMan on February 16, 2017, 01:35:54 pmThis by itself doesn't mean anything!Capacitor failures are not always physically obvious. They could also look fine, yet be faulty.If you don't have Capacitance & ESR meters handy, I'd suggest you have all of em replaced to be on the safe side.Just make sure you put low ESR caps in there (and not general purpose).Bad capacitors are the #1 reason for monitor issues. Also, I'm not sure what is your level of experience with repairing electronics, so I'm just gonna put it out there, apart from the obvious option of repairing the monitor's power board yourself, you could also get a replacement board from ebay (the board should have a part number on it, which you could look up!)

author: james_s
author_rank: Super Contributor
timestamp: February 16, 2017, 04:38:46 pm
content: Electrolytic capacitors are the most common fault I see with these. Often they look perfectly fine but test bad.

author: IntruderMan
author_rank: Newbie
timestamp: February 17, 2017, 04:03:18 am
content: Quote from: The_Penguin on February 16, 2017, 03:07:16 pmThanks for responding but i don't see a fuse on the t-con board,just the power board.Sent from my SM-N900V using Tapatalk

author: IntruderMan
author_rank: Newbie
timestamp: February 17, 2017, 04:04:56 am
content: Quote from: mzacharias on February 16, 2017, 03:36:32 pmThanks for responding,only fuse I see is on the power boardSent from my SM-N900V using Tapatalk

author: IntruderMan
author_rank: Newbie
timestamp: February 17, 2017, 04:08:17 am
content: Quote from: mzacharias on February 16, 2017, 03:36:32 pmSent from my SM-N900V using Tapatalk

author: casinada
author_rank: Frequent Contributor
timestamp: February 17, 2017, 11:35:55 pm
content: That is normal behavior when the CFL goes out. The Display has 2 CFLs. if one is bad it will turn on for a second and then go off. I have a garage full of 22 and 23 inch Dell LCD's with that problem. Too much work to replace the CFL. The CFL replacements are expensive.

author: james_s
author_rank: Super Contributor
timestamp: February 18, 2017, 12:39:38 am
content: Replacing the CCFL tubes is not really that hard on many monitors. You can get LED kits now to retrofit them, they come with a strip(s) of LEDs and a driver board.

author: Rasz
author_rank: Super Contributor
timestamp: February 19, 2017, 02:23:23 am
content: does the OSD menu show up at all?

author: IntruderMan
author_rank: Newbie
timestamp: March 21, 2017, 02:47:37 am
content: Quote from: The_Penguin on February 16, 2017, 03:07:16 pmQuote from: Rasz on February 19, 2017, 02:23:23 amHey, sorry for just getting back to you, to answer your question, no menu shows up.Sent from my SM-N900V using Tapatalk

author: IntruderMan
author_rank: Newbie
timestamp: March 21, 2017, 02:50:57 am
content: Quote from: Rasz on February 19, 2017, 02:23:23 amNo the menu doesn't show at allSent from my SM-N900V using Tapatalk

author: IntruderMan
author_rank: Newbie
timestamp: April 09, 2017, 07:19:22 pm
content: Hello all,well I got my hands on a working Dell 2405 monitor opened it up and swapped out the t-con board from mine to the working monitor now it has the same response has what I experienced,back lights come on but no picture, swapped them back,everything fine.I was afraid to put the working board in mine in fear of possibly damaging it.Does anyone have a 2405 t-con board they want to sell?Hard to find one. ThanksSent from my SM-N900V using Tapatalk

author: quake
author_rank: Newbie
timestamp: November 21, 2024, 06:27:30 am
content: Were you able to figure out the cause?Same issue. I can see the backlight go on but there's no menu and buttons don't work, and inputs do nothing.It's as if it's a software/firmware issue somehow.