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Re: Dell E207WFPc
No there are no markings at all except on the board it says F5 which of course means nothing.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."
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Re: Dell E207WFPc
You can try to measure the amps using your multimeter. You may have to solder in some wires to each side of the fuse and then connect those wires in series with your multimeter. Set your multimeter to 10 A and don't run it for more than 30 seconds.--- begin sig file ---
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Re: Dell E207WFPc
Ok I will give it a try. I have found a Service Manual for this monitor, but it does not refer to the Panel Control board at all as far as schematics and parts list.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
If you can't measure with a multimeter, then measure the fuse dimensions in millimeters and maybe order one or two of each
fast blow, 3A,
fast blow, 4A,
fast blow, 5A--- begin sig file ---
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Re: Dell E207WFPc
PS. Be very careful with those ribbon bonds from the panel board to the actual lcd panel. I accidentally somehow tore a small strip and it results in a solid vertical black bar.
AFAIK, the ribbon bonds are welded together and not user repairable.--- begin sig file ---
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Re: Dell E207WFPc
Ok will try both multimeter and measuring. ThanksHave you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
Multimeter is a no go. If I assemble the monitor to get power I can't read the fuse because it is on the underside of the panel control board. I would have to hook up the flat cable running from the main board to the panel board and that keeps me from getting to the underside of the panel board. I have measured the SMD Fuse and ordered Fast Blow 3A, 4A and 5A Fuses (2 of each) that match the size I came up with. The DC Voltage on those is 32V. Sounded a little high, but I'm guessing that means that it will handle up to 32V before blowing.
Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
No. The voltage rating on a fuse is the minimum voltage it can interrupt. A 32 volt fuse will not 'blow' if used on a 120 VAC circuit - but it may fail to open properly if the current goes above the fuse's rating.Multimeter is a no go. If I assemble the monitor to get power I can't read the fuse because it is on the underside of the panel control board. I would have to hook up the flat cable running from the main board to the panel board and that keeps me from getting to the underside of the panel board. I have measured the SMD Fuse and ordered Fast Blow 3A, 4A and 5A Fuses (2 of each) that match the size I came up with. The DC Voltage on those is 32V. Sounded a little high, but I'm guessing that means that it will handle up to 32V before blowing.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E207WFPc
I'm back. Installed the 3A SMD fuse on the Panel Board. Still did not get a picture or lights on the panel. There are two transistors (3 legged with large soldered tab) on the panel board. One of them is located next to the fuse I replaced. I took resistor readings on both of them.
I looked for Data Sheets on both of these and could not find anything
First Line Reads J343 Second Line Reads 9117-18
U1 = Pin 1 - Pin 2 = 263.1 ohms, Pin 1 - Pin 3 = .442 Kohms, Pin 2 - Pin 3 = .707 K
First Line Reads J343 Second Line Reads 9117-33
U4 = Pin 1 - Pin 2 = .441K, Pin 1 - Pin 3 = .720K, Pin 2 - Pin 3 = 1.291K
Also would it make a difference if I used a 5A instead of the 3A Fuse? Since I have a 4A and 5A also.
Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
Those are not transistors; they are voltage regulators. With the power supply connected to the signal card and to AC power, measure the voltage from pin 1 to pin 2 and to pin 3 on each of these.I'm back. Installed the 3A SMD fuse on the Panel Board. Still did not get a picture or lights on the panel. There are two transistors (3 legged with large soldered tab) on the panel board. One of them is located next to the fuse I replaced. I took resistor readings on both of them.
I looked for Data Sheets on both of these and could not find anything
First Line Reads J343 Second Line Reads 9117-18
U1 = Pin 1 - Pin 2 = 263.1 ohms, Pin 1 - Pin 3 = .442 Kohms, Pin 2 - Pin 3 = .707 K
First Line Reads J343 Second Line Reads 9117-33
U4 = Pin 1 - Pin 2 = .441K, Pin 1 - Pin 3 = .720K, Pin 2 - Pin 3 = 1.291K
Also would it make a difference if I used a 5A instead of the 3A Fuse? Since I have a 4A and 5A also.
No; either the board (and LCD panel) is good and it won't blow the fuse, or something is bad and using a larger fuse will only do more damage.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E207WFPc
Thanks Bill I will tackle this in the morning.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
Bill, I checked the voltages as you requested. I could not get a reading on either one of the voltage regulators. I tried both AC and DC. I rechecked the fuse and it reads good (0.1 ohms).
Does this mean that I need to replace the regulators or that power is not getting to the panel control board?Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
It means power is not getting to the regulators, or we are dealing with 'technician error'.
Let's step back to basics for a minute.
Test configuration: Power supply board, no inverter outputs, no connection to the signal card, resting upside down on a insulating material - piece of cardboard, etc. in the same orientation as the picture in the first post. From left to right, note that there is a mounting hole with a grounding pad around it, L903, L904, and the connector to the signal board.
Set your meter to the 20 VDC range. Hook up AC power and CAREFULLY check the voltages from the ground pad to either side of L903, L904, and pins 9&8, 7&6, 5&4, 3, and 1 of the connector. Disconnect AC power.
You should get readings in the 5 volt and 12 volt range. If you not no reading of more than 1 volt, stop and report the problem.
If you got readings in the expected range, hook the power supply to the signal card (no need at this time to hook it to the LCD panel or control panel). Hook up AC power and repeat the tests. Disconnect AC power and report the results.
If you got good readings on both attempts, provide a picture of the signal card.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E207WFPc
Ok I will get on that and report back. Technician Error is certainly a possibility.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
On L903 on both pins I got 5v
On L904 on both pins I got 14v
On connector to signal board Pin 9 and 8 are ground pins
Pin 7 & 6 I got 5v as printed on board
Pin 5 & 4 are blank (no wire)
Pin 3 reads 0v
Pin 2 blank (no wire)
Pin 1 reads 0v
On signal card connector I got the same readings on each wire as above.
Pictures of signal card attached.Attached FilesHave you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
OK, power supply is working, and sending 5 VDC to the signal card. Did you check the wires at the connector or at the signal board itself? The connector pin seems to be a little high.
Unfortunately, the picture of the top of the signal board leaves a little to be desired, could you retake it, please.
Whoops, just to make sure we are on the same page, this is NOT the 'panel board' you referred to above, is it?
PlainBillLast edited by PlainBill; 12-03-2011, 04:05 PM.For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E207WFPc
No it is not the panel board. That board is attached to the back of the LCD Screen. I took the readings from the connector. The connector on the power board has nine pins in a straight line. The connector on the signal board has two rows of pins so I was not sure which pin was which and I just measured at the top of the connector where I could tell what wire went where. I will try to get a better picture. It is dark here now so I will take it first thing in the morning.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Dell E207WFPc
A quick background on what is happening here. A monitor is totally 'fly by wire' - the processor on the signal board controls everything. Once the power cord is plugged in it scans the front panel looking for a key press. It turns the power LED Green (or blue), amber, and off, the inverter on and off, adjusts the brightness, and turns the power to the LCD panel on and off. And of course, it also processes the video information.
At this point it's very likely the signal card is bad and we have to figure out if it is repairable.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E207WFPc
I understand. Hope these pics will help.Attached FilesHave you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Hello all,
this is my first post, so if I make mistakes please do not hesitate to point them out, thank you in advance.
I got a Dell Latitude 5420 (Service Tag: 7RFM6D3, Motherboard: GDF40 LA-491P Rev.: 2.0 (A01)) which does not start and I want to repair it. These are the symptoms:
If the laptop is only connected to the AC adapter (battery removed):
When I press the power button, the keyboard backlight and the display backlight are turning on. Caps key light is lightning, but key does not respond to pressing it.
The power/battery... -
I have a Dell Latitude 5530 with a damaged RJ45 network connector. See the attached pictures.
Have already searched on Farnell / Aliexpress / Ebay and had contact with several suppliers on Aliexpress and Ebay, but they cannot deliver this connector.
Is there someone inside the EU, who has these connector(s) or perhaps defective motherboard(s) for these laptop models I have mentioned in the topic title.
Pictures of these boards:
Dell Latitude 5520 https://www.ebay.com/itm/256052956663
Dell Latitude 5530 https://www.ebay.com/itm/125844181534
Dell... -
My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
Hello!
I have a problem with a Dell G5 SE 5505 laptop that I hope someone can give me a few pointers on.
[OK, it's not really a laptop, I'm running the motherboard on my desktop with only cooling, RAM and an M2 drive attached.]
I had some performance issues, so I decided to update my BIOS from 1.7.0 to the latest version, 1.20.0.
The computer restarted and the update dit not want to continue without a battery connected, even though I used dell's method of bypassing this requirement.
I tried updating to a custom BIOS from Reddit user Satori_Nori https://www... -
Hi everyone,
I'm in need of assistance with a Dell Precision 5820 Tower. The BIOS is locked with "Dell Security Manager," preventing access to the HDD-1 hard drive.
**Background:**
I recently purchased this Dell Precision 5820 Tower from a recycler who salvages equipment from abandoned office spaces. The computer was left behind by its previous owner and was password locked. Given that it can run Windows 11, I saw this as an opportunity to upgrade my setup.
**What I've Tried So Far:**
1. I accessed...
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