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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

07-07-2021, 06:30 PM
Re: Dell 2007FPB teardown

OH!! WHAT Was I Thinking... Sorry you are right ! about That AC Coming or going to Transformer, Transformer would never work on DC either for Primary or Secondary as it works with the Inductance Phenomenon.

Still, I need the Codes for the resistors, and Zener Diodes, Furthermore if you find out any Problem with the PCB, Solder Joints, or shorts, any help would be Greatly Appreciated !

And one thing more that's been messing up my mind, I asked that in my Previous post as well, why convert it into DC if we...

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Last edited by knightace; 07-07-2021, 06:32 PM.
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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

07-03-2021, 02:38 AM
Re: Dell 2007FPB teardown

Its not Secondary, its Primary thats connected with the Transistor, Look I am confused here, because the Voltage that I read after being rectified into DC from 450V 180uf Cap is 328V dc. And then the Transformer shows above 1000V , How is it even possible ! . I dont know much but I will tell you what I understood about this Board. It takes 220V Mains AC , Rectifies it into DC, then converts it back to AC for the Transformer , steps down it to 19v and then rectifies it back again. If this is right what I said, then why convert it into DC if we want to step...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-30-2021, 04:08 AM
Re: Dell 2007FPB teardown

You are Right that Burnt Resistor that I shared was linked with Q601 (Its a Transistor with Code 2SK3548, I'm not sure but im guessing it is used to create sine wave Electrical Signals), By the way the DC from the Transformer was above 1000V thats what my Multimeter was showing ( its max Limit is DC 1000V)...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-29-2021, 07:51 AM
Re: Dell 2007FPB teardown

Today I took the Images from Closer look of the board. The Codes are pretty Clean. There was also some kind of Fume like colour on the Solder tips of the Components attached from the Top of the board and a high watt resistor Burnt/damaged. All the Images are shared. I would also be grateful if you people could find the root of this damaged, because what i did was only using multimeter and checking voltages across ground and points on the board (With board connected to AC Mains) and suddenly

The Images with name circuit-index will give...

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Last edited by knightace; 06-29-2021, 07:54 AM. Reason: I didn't feel that my Reply was clear enough
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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-27-2021, 01:28 AM
Re: Dell 2007FPB teardown

I am so sorry for the image, I only shared it for Reference, Just to point out the Faulty resistors and zener diodes. I will upload full focused Image and images from different angles so that you get a clear image of the problem I have with the board. I will upload Complete set of Images of the board and the damaged part of the board with enough focus that you can clearly see the Resistor codes aswell as the Damaged Portion.

Thank you So much again for replying me. ...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-24-2021, 10:12 AM
Re: Dell 2007FPB teardown

but its for Dell 2407 not 2007 plus I'm New in this Field . If you could really help with the area in the red Square. That area is burnt ( Resistors and A zener diode) if i could get the codes, i could replace them all. If you or anyone could arrange a Picture containing that area so that i could get smd resistor codes, I would be really really Grateful
The image of the burnt Part of PCB has been attached with this Post as well...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-23-2021, 07:33 AM
Re: Dell 2007FPB teardown

Guys.. a little help would be appreciated. I have burnt power board of Dell 2007WFPB. This Board has burnt SMD resistors, the Board number is 4H.L2J02.A04. I have attached image of the board. if anyone could get me a clear picture of the board from bottom, kindly attach it with your reply, I am in a real need of the smd resistor codes on the bottom of the power board. The image for Reference has been attached with this post...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

06-15-2021, 11:45 AM
Re: Dell 2007FPB teardown

I found the Problem, I was connecting the Connector the opposite way, that is the reason why the fuse blew. (Due to Direct Short Circuiting) but Now there is another problem, I got LCD Running Perfectly, but there is no Picture. I mean that The Backlight is OK and Working but there is no Picture, like No Input, or no Signal etc.

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knightace started a topic DELL WFPB 2007 Not Powering ON

in Troubleshooting Computer Displays

06-01-2021, 03:11 AM
DELL WFPB 2007 Not Powering ON

Hi Guys! I know that there is a similar thread about this LCD, I posted my problem there too, but there was no reply. I have same problem that the LCD is not Powering on. I followed this thread, Thanks to BUDM

[url]https://www.badcaps.net/forum/showthread.php?t=20531[/url]

and it Worked too but again the LCD is not powering on now.

Here are my Efforts and Findings:

1) I replaced all the resistors i.e. 272, 753, 153, 473 above TL1451A (U3) IC [B](For Reference follow Image 1 )[/B] on the USB Board of the LCD.

2) Then I...

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

05-31-2021, 01:31 PM
Re: Dell 2007FPB teardown

ok Guys today I replaced the Resistors and the Fuse. It worked but when I attached Panel, it again blew the fuse.Its not Powering on now. I don't know why is this happening. Any Suggestions would be greatly appreciated

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knightace replied to Dell 2007FPB teardown

in Troubleshooting Computer Displays

05-30-2021, 02:36 PM
Re: Dell 2007FPB teardown

Thank you So Much Gastorro. I was searching for this. I actually damaged the 272 Resistor alongside with its fellow resistors, I was hoping to resolder them all but since I'm new in this field and was just doing it for repair, I damaged their Codes while removing that white glue like stuff. Now I tried to check their Resistance and found that the Resistor with code 753 is not working.Resistor with code 473 is showing only 762 ohms resistance. And I accidently damaged the board from where 272 SMD Resistor was . Luckily i tried to perform...

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Last edited by knightace; 05-30-2021, 02:48 PM. Reason: I forgot to upload my Mistake in an Image
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knightace replied to New Members - please post your introductions here

in Announcements & Related News

05-30-2021, 12:39 PM
Re: New Members - please post your introductions here

Hi Guys First of all im noob in this field (although it is very Interesting) and im new aswell but I surfed the web and To be Honest this website proved very useful. My first search was on Dell wfpb2007 and there was a thread related to my problem . Im sure i will get Help from here in the future. The same reason i Signed up on this forum. Thanks to Topcat, badcaps really Helped me.

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