Re: Dell E151FP ~ Blues/Greens come & go
I don't think heat is an issue. Its usually all red when I turn it on, and then the other two colors may or may not come on during the time that the monitor is on.
alegro
Member
Last Activity: 08-18-2010, 05:03 PM
Joined: 02-24-2010
Location: Virginia, USA
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Re: Dell E151FP ~ Blues/Greens come & go
photos of boards...Leave a comment:
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Dell E151FP ~ Blues/Greens come & go
When I got this Dell E151FP LCD (used) all the colors were fine. Now the blues and greens are out most of the time, leaving only reds. But some times the blues come back in for a few minutes or hours. And sometimes all three colors are working.
Is there possibly a loose connection or something? I've never had a monitor that did this before. -
Re: Envision TFT1780
The sense lines go to these tiny surface mounted resistors. I wouldn't be able to solder those. I can barely manage capacitors and other large components. Are there any other options?Leave a comment:
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Re: Envision TFT1780
Thanks for the info. I like to learn the theory instead of just what to do.
I have something interesting to report. I did the readings for the left and right returns. Then the second time I pressed the power button to meaure the DC voltage on the left sense, the monitor stayed on. I heard some very faint squealing noises, and the voltage was holding (within the range listed below), and so I looked at the screen and it was on. The "cable not connected" message was displayed.
Then I did the right sense reading, and then...Last edited by alegro; 04-03-2010, 02:03 PM.Leave a comment:
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Re: Envision TFT1780
I really appreciate your help on this PlainBill.
[U]Left side[/U]:
return: 10.5 V AC
sense: 8.3 V DC
[U]Right side[/U]:
return: 19.5 V AC
sense: 22.2 V DC
The right side sense took longer to return to zero (7 or 8 seconds).Re: Envision TFT1780
I really appreciate your help on this PlainBill.
[U]Left side[/U]:
return: 10.5 V AC
sense: 8.3 V DC
[U]Right side[/U]:
return:Leave a comment:
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Re: Envision TFT1780
I've never done this before, and I don't want to fry my meter or do it wrong. Can you tell me where to put the + & - leads?Leave a comment:
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Re: Envision TFT1780
Here's some closeups....Leave a comment:
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Re: Envision TFT1780
On autorange:
'B to 7th pin' was .438 K ohms
'C to 7th pin' was .437 K ohmsLeave a comment:
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Re: Envision TFT1780
For the A>B, and C>D readings (yesterday) I had it on Autorange.
Today I got out-of-range readings on A>B, and C>D no matter what setting I had it on.
B to each of the first 6 pins were ~19.7 K ohms
the 7th pin (closest to the edge of the invertor board) was 0.4 K ohms
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C to each of the first 6 pins were ~18.9 K ohms
the 7th pin (closest to the edge of the invertor board) was 0.4 K ohms
(I did these readings on the 00.0 K ohms setting.)Leave a comment:
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Re: Envision TFT1780
The resistances for both A>B, and C>D are 0.L
The IC part number is:
23A8RVK
TL1451A
If you still need the photo of the top let me know.Leave a comment:
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Re: Envision TFT1780
Here are some photos of the rear of the inverter....Leave a comment:
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Re: Envision TFT1780
I did a little google searching but I couldn't find anything useful. My TFT1780 is still sitting in the corner because I don't have the equipment to diagnose it.
Do thesse units have good display quality and resolution? Mine was non-functioning when I got it.Leave a comment:
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Re: several beginner questions
Are you refering to isa slots? -the predecessor of PCI slots?
If so, I can check. I'm sure I have a P3 board with ISA slots if any board will do.Leave a comment:
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Re: several beginner questions
If I decide to stick with repairing LCDs, power supplies etc (due to my limited equipment and limited skill) -would it be possible to find one or more people here that would recap some mobos for me in exchange for other recappable mobos and/or other computer parts?
I've got more parts than free time. Will I get ripped off mailing boards to someone? Is this commonly done among the badcaps forum members?
Also will it be worth it after the shipping costs? I'm in the continental US. The boards are mostly P4 and Athlon XP....Last edited by alegro; 03-01-2010, 11:11 AM.Leave a comment:
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Re: Envision TFT1780
Is there tutorial information on this site about how to do this?Leave a comment:
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Re: several beginner questions
profile updated. Thanks for pointing that out stj.Leave a comment:
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Re: Envision TFT1780
Thank you for the hints. Will I need a schematic for this?Leave a comment:
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Re: several beginner questions
Thanks for the info everyone.
Any comments on post #8, question 6? Do people here do that sort of thing? Is it worth it after the shipping costs? The boards I have are mostly Pentium 4, and Athlon XP.Leave a comment:
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Re: Envision TFT1780
I tried it in the dark. There was no visible arching, and no noise. The display comes on for less than 2 seconds, and then goes off. I wait a few seconds and press the power button again and same thing.
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Google searches lead to a mass of [I]words[/I]. They are only wealth if one understands them and knows something having read them.Re: Envision TFT1780
I tried it in the dark. There was no visible arching, and no noise. The display comes on for less than 2 seconds, and then goes off. I wait a few seconds and press the powerLeave a comment:
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