Dell 2407WFPb Monitor - Bad Cap

[Nickkip]

Re: Dell 2407WFPb Monitor - Bad Cap

http://youtu.be/ICJcvwSdgIQ

[Nickkip]

Re: Dell 2407WFPb Monitor - Bad Cap

Just been looking and looks like D603 the Glass/plastic on the SMC most is missing.

[budm]

Re: Dell 2407WFPb Monitor - Bad Cap

Put your meter in diode mode and check to see if it is still tested out like Diode.
http://s807.photobucket.com/user/bud...?sort=3&page=1

[Nickkip]

Re: Dell 2407WFPb Monitor - Bad Cap

seems ok

[Nickkip]

Re: Dell 2407WFPb Monitor - Bad Cap

Hi does anyone have a service manual or a schematic for this board I can I have please

[jetadm123]

Re: Dell 2407WFPb Monitor - Bad Cap

You can try this link, post #8

https://www.badcaps.net/forum/showth...WFPb+schematic

[Nickkip]

Re: Dell 2407WFPb Monitor - Bad Cap

hi got that thanks! do you know what type of diode is used? as there is no info on them. also that link was for the 2407 if I get service diagram for that are they about the same?

thanks

[ehorschman]

Re: Dell 2407WFPb Monitor - Bad Cap

Success reviving Benq FP241W

Thanks to the posts in this forum, I was able to fix my Benq FP241W that wasn't powering on and saved a few hundred dollars on a replacement. The Benq FP241W uses the same power supply board as the Dell 2407 and I noticed brown leakage at the positive terminal of the 120uF 450V capacitor (C605) and the ceramic coating on R670 was flaked off. I replaced the components listed by elvena, micdis and others. I didn't test the components to see what had actually failed - I just replaced everything listed below.

Component ID / Replacement Part / Digikey Part Number

C605 / Rubycon 450QXW120MEFC18X31.5 / 1189-1377-ND
Q651 / STMICROELECTRONICS - STP10NK60ZFP / 497-5892-5-ND
IC651 / STMICROELECTRONICS L6561D013TR / 497-4582-1-ND
R669 / Panasonic ERA-8AEB1021V / P1.02KBCCT-ND
ZD601 / Vishay TZMC15-GS08 / TZMC15-GS08CT-ND
IC601 / ON Semiconductor NCP1200D100R2G / NCP1200D100R2GOSCT-ND
R670 / Yageo PNP300JR-73-0R22 / 0.22AECT-ND
F601 / LittleFuse 0234004.MXP / F2692-ND + F1504-ND fuse holder
C622 / Nichicon UPS2A010MDD1TD / 493-5378-1-ND
Q654 / Fairchild Semiconductor MMBT3906 / MMBT3906FSCT-ND
D655 / Diodes Inc. 1N4148W-7-F / 1N4148W-FDICT-ND

As a precaution, I replaced these other caps on the power supply board:

C711-C715 / Panasonic EEU-FM1V471 / P12415-ND

and these three caps on the CCFL driver board:

? / Nichicon UHE1V221MPD6 / 493-1579-ND

I'd never de-soldered/soldered surface mount components before, so I practiced for a while using a dead board. I found I had to be careful when de-soldering ICs and SMT transistors to avoid tearing off the contact pads.

[LiPeng]

Re: Dell 2407WFPb Monitor - Bad Cap

I have a 7-8 yrs. old Dell 2405fpw monitor and also had problem with the power supply board. So far I changed the following components, but when put it back and tried to switch it on, nothing happens:

C605 / 450TXW100MEFC18X35 CAPACITOR, RADIAL, (450V, 100UF, since I couldn't get a 120 uF at the moment)
Q651 / STP10NK60ZFP MOSFET, N, TO-220FP
IC651 / L6561D PFC 90UA START + DISABLE, SMD, 6561
R670 / PNP1WVJT-52-0R22 RESISTOR, 1W, 5%, 0R22
F601 / 0001.2510 FUSE, ANTISURGE, CERAMIC, 4A
C622 / EEUFC2A1R0 CAPACITOR, RADIAL, 100V, 1UF

The fuse kept intact, but no indicates for any life of any sort, what could I else do?

[budm]

Re: Dell 2407WFPb Monitor - Bad Cap

@lipeng, please re-post in 2405 thread or make a new one.
Is this the same board you are working on?
http://s807.photobucket.com/user/bud...?sort=3&page=1

[LiPeng]

Re: Dell 2407WFPb Monitor - Bad Cap

Yes, only the revision no. is A02: ie. 48.L1E02.A02

[LiPeng]

Re: Dell 2407WFPb Monitor - Bad Cap

Just a quick update: After have exchanged all components listed in #448 of this thread, the monitor powerd up! I'm writting this update with the newly repaied monitor. Totally amazing .

Ps. did change all caps on the power supply board, but not on the CCFL driver board.

[metulec]

Re: Dell 2407WFPb Monitor - Bad Cap

Hello to all community,

I also have a 2405 with a failed C605 and all the company of MOSFET and IC that it brought down. In this thread it was mentioned only ZD601 (15V). Even if the remaining Zeners should not be affected by the cap failure, I measured ZD602 and ZD603. Both are 24V, if anybody wanted to know.

Cheers

[arber]

Re: Dell 2407WFPb Monitor - plzz somebady tell the number of this thing i cant read

[arber]

Re: Dell 2407WFPb Monitor - Bad Cap

plzz tell the number of this little thing i cant see in this foto becaus this is so little plzz tell me that the number

[arber]

Re: Dell 2407WFPb Monitor - Bad Cap

Put your meter in diode mode and check to see if it is still tested out like Diode.
http://s807.photobucket.com/user/bud...?sort=3&page=1

plzz tell the number that blcak little chip i cant see

[budm]

Re: Dell 2407WFPb Monitor - Bad Cap

What is the IC designator, IC651?

[rocket]

Re: Dell 2407WFPb Monitor - Bad Cap

Thanks to this board I have managed to repair my 2405. Many thanks to the contributors. I had the usual initial failures:
R670 (blown - replaced by cheap metal film 2W off ebay)
C605 (blown - replacement sourced from ebay again)
IC651 L6561D (destroyed - replaced over ebay)
Q651 SK3502 (shorted pins on testing - replaced via ebay)

Oddly the fuse was still intact but the monitor did not power on.

Then replaced:
IC601 NCP1200D (from RS couldn't wait!)
ZD601 15V 0.5W zener from local shop

Fired up perfect!

[braxton]

Re: Dell 2407WFPb Monitor - Bad Cap

Tyan, the speaker socket/power mod is a simple three-step process:

1) In the photo attached below I have marked both ends of L702, which is to be removed from the PCB, with magenta crosses. De-solder or just cut both ends of this inductor (a bit of wire that passes through a ferrite bead on the component side). This isolates the power socket from it's normal supply circuit.

2) The short blue line shows where to solder a bridging wire to permanently ground the switched contact for the socket CN703 - making it seem that the speaker isn't plugged in. A blob of solder across C718 would also do the trick.

3) Run a decent gauge stranded, insulated wire between the points marked with an orange line. To get a good solder joint on the land between C713 and F701 scrape away the lacquer first. The other end of this wire goes down onto the middle pin of socket CN703 which is already quite well exposed for soldering.

That's really all there is to it! The central pin in the speaker socket may be a little smaller than the power-brick plug (2.1mm vs 2.5mm I think) If it doesn't connect very well, it might be necessary to roll a small piece of copper or tin shim to increase the diameter of the centre pin. If that's too fiddly then you can always swap the socket for the correct sized one, or find an adaptor lead. I slipped a slender wire crimp insert over the pin which worked a treat.

Has anyone got this mod to work on the 2405? I tried this mod with a 19V 4A power supply and still no power???

[braxton]

Re: Dell 2407WFPb Monitor - Bad Cap

Has anyone got this mod to work on the 2405? I tried this mod with a 19V 4A power supply and still no power???

Also, does this mod replace the need to use the power on/off button on the 2405? The reason I ask is that I'm beginning to suspect that I am having a power on triggering problem with the power switch.

How can I bypass the power on button switch on the main board itself?