Announcement

Collapse
No announcement yet.

User Profile

Collapse

Profile Sidebar

Collapse
Avatar
Blackthorn
Member
Last Activity: 07-25-2014, 03:20 AM
Joined: 07-29-2013
Location: California
  •  
  • Filter
  • Time
  • Show
  • Source
Clear All
new posts
  • Blackthorn
    replied to low ESR or low impedance?
    in Troubleshooting Power Supplies and Power Supply Design
    Re: low ESR or low impedance?

    By looking at the graph on the ESR meter, I saw that a 2.2uF capacitor rated at 50V would still be within limits at close to 40 Ohms...? One had such a high reading that the meter just showed a - which means that it is out of range for the meter which is good for up to 99 Ohms. So at least one is definitely bad.

    I thought since the capacitors were cheap, and the readings so varied that they might all be starting to fail.

    I will try to get some pictures of the power supply later. My phone has a lousy camera on it,...
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to low ESR or low impedance?
    in Troubleshooting Power Supplies and Power Supply Design
    Re: low ESR or low impedance?

    Thanks, I remember that Impedance is the total opposition to current flow, but of course as was stated here the frequency of the circuit is an important factor when determining the proper capacitor.

    I really appreciate the explanations and am really enjoying my review of electronic theory. Much of which I have forgotten.

    I am needing several 2.2 uF 50V capacitors for my power supply, since most of them have failed and have a high ESR; anywhere from 4.4 ohms, 5.5 ohms, and even one that is off the scale. I am using the Blue...
    See more | Go to post
    Last edited by Blackthorn; 10-08-2013, 01:48 PM.

    Leave a comment:

  • Blackthorn
    started a topic low ESR or low impedance?
    in Troubleshooting Power Supplies and Power Supply Design

    low ESR or low impedance?

    What is the real difference between a low impedance capacitor and a low ESR capacitor? The reason I am asking is when I go searching on Mouser, they categorize them differently. I would think that a low impedance capacitor would also have a low ESR. I guess it would depend on the circuit the capacitor is used in. I have been away from electronics theory for way too long.

    Maybe someone could explain this to me. I would also think that a low ESR capacitor would be preferred over others in a power supply.

    Any help here would be a great help, since I am working on both...
    See more | Go to post
  • Blackthorn
    replied to The GOOD Capacitors Thread!!
    in General Capacitor Questions & Issues
    Re: The GOOD Capacitors Thread!!



    It is probably one to add to the bad list...?

    Yes, I think you are right. I should have probably started a new thread. The one you linked to at mouser should work great, thanks! I wonder how I missed that one, I searched mouser and all I could find was an out of stock one.

    Yes, the way the board is I would have to modify it to use the snap in type. I will check the clearance a bit closer, but the 40mm height should work fine.

    Thanks!...
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to The GOOD Capacitors Thread!!
    in General Capacitor Questions & Issues
    Re: The GOOD Capacitors Thread!!

    Anyone hear of KC? I can't seem to find any information on their capacitors anywhere. I found some on Ebay which are exactly what I need. But when I asked what the manufacturer is, they told me KC. I need a 470uf 200V 22 wide x 37 high radial straight leads. They may just be another junk capacitor, but I would like to know since I really want quality components.

    ...for my power supply.
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to BLue ESR meter installation pre-testing
    in Equipment Usage, Soldering, Techniques, and Reviews
    Re: BLue ESR meter installation pre-testing

    Ok, I finally had time to finish my meter. I used flux remover 4140 by MG Chemicals in Canada and Super Wash Electronics Cleaner 406B-425G. (NOTE: These chemicals are highly flammable and cannot be used near any spark or flame source. So I cleaned it outside.)The 4140 is a liquid cleaner that you submerge your board into. I used a hogs hair brush to clean the surface. When you are done you hold the board in a vertical position and spray the Super Wash across both sides of the board. It came out beautiful!

    One thing that...
    See more | Go to post
    Last edited by Blackthorn; 09-27-2013, 06:01 PM.

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement



    I think we are talking about two different things here. The computer is not that old, but I don't think the CPU is really the issue here in this case. I am not having any issues with the CPU, so I don't think that changing the thermal paste on the CPU is going to fix my problem.

    I think it could be that "reflowing" the solder on the video chip could fix the problem, but I would only do that if I could get hold of the proper equipment. I think I would replace the tin solder balls with...
    See more | Go to post
    Last edited by Blackthorn; 09-17-2013, 12:49 AM.

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    One thing I was trying to do was to get a micrograbber small enough to fit onto the very small leads of the connector that is soldered to the board. Even my smallest will not attach to the pins. I really don't want to take any chances of shorting the pins out with my test leads when I power it up.

    Another thing I wanted to do was to have the keyboard and all other ribbon cables connected so that the laptop will function normally when it is trying to boot up. My concern was that I would get a load of errors for...
    See more | Go to post
    Last edited by Blackthorn; 09-16-2013, 01:22 PM.

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    The only info I can find on the board (without removing it again).

    CN-0G8RW1-70166-167-0CQA-A01
    It uses the HM67 Intel Huron River chipset (as far as I can tell).
    It uses the Nuvoton NPCE795 keyboard controller.
    So it looks like revision A01

    I cannot find the PCB P/N as is on page 2 of the manual.

    I may have to pull the board out entirely to get to any more info.

    edit: There are several numbers on the case, but they seem to apply to the case itself....
    See more | Go to post
    Last edited by Blackthorn; 09-13-2013, 12:41 PM. Reason: to correct info

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement



    I have been trying to verify that I have the correct schematic since I downloaded it. I am going to take the voltage readings anyway just to see what I get...

    I will have to take another look at the laptop to see if I can verify that I have the right manual.

    Inspiron 15R N5110...
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    I found the proper fuse: F4901 It is rated for 1 Amp at 24V. The fuse tested good. I can find no sign of overheating anywhere.

    So, as far as making voltage tests, what is recommended?




    So did you do the reflow yourself using an oven or heat gun? How did you go about it?

    edit: I found some information on the Backlight Connector on page 69 of the schematics. Strange they have it on the page titled: Keyboard/Touchpad.

    It seems there is a fuse F6901 for the...
    See more | Go to post
    Last edited by Blackthorn; 09-12-2013, 04:19 PM. Reason: OOPS

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    So speedypro fixed the problem just by cleaning around the gpu with MEK? I am familiar with MEK (Methyl ethyl ketone). We used to use it to clean our paint equipment. I used all the protection equipment; gloves, respirator, and goggles, so hopefully I didn't get any serious exposure to it. It is absorbed through the skin, for those who intend on using it. I would be very careful. (Although the US gov't no longer thinks it is bad stuff, I really think it will destroy your liver.)

    What about using CRC QD Contact...
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    I am looking for the proper schematic. I found the one you (Spidey) posted in another thread.
    dell_inspiron_n5110_m5110_dq15_wistron_queen_15_intel_discrete_uma_sandy_bridge_rev_a00_sch.pdf

    I am looking on page 49 at what I believe is the 30 pin connector that makes the connection from the motherboard to the video screen. It looks like the LCD brightness is pin 5.

    So you are thinking a possible blown fuse, so the screen can't light. It might only be lit through another pin such as a test pin?......
    See more | Go to post
    Last edited by Blackthorn; 09-12-2013, 11:19 AM. Reason: clarified information

    Leave a comment:

  • Blackthorn
    replied to Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron N5110 dark screen after HDD replacement

    Well, I went ahead and reopened it up, reinstalled the old HDD and gave it another test. Same problem. So, I put it back together with the good HDD, connected it to an external video screen and ran some BIST tests. I hit F12 when booting up and ran all of the Dell diagnostics. They all passed, so I reran the screen tests with the external video turned off. I ran the complete tests without acknowledging that I saw any video test patterns. The video card patterns could only be seen with a flashlight, but the screen color tests...
    See more | Go to post

    Leave a comment:

  • Blackthorn
    replied to BLue ESR meter installation pre-testing
    in Equipment Usage, Soldering, Techniques, and Reviews
    Re: BLue ESR meter installation pre-testing

    Hey thanks! I really appreciate your help! I missed out on that manual. Glad I requested help with it.

    Now I really need to get a good flux remover... Isopropyl Alcohol just doesn't cut it. I was thinking about using MG Chemicals 4140. I want the liquid product. I want something safe to clean with, and not damage the plastics or components. I hate sticky boards.

    I will clean it up a bit before I get the IC's installed.
    See more | Go to post
    Last edited by Blackthorn; 09-06-2013, 12:38 AM. Reason: mistyped product number

    Leave a comment:

  • Blackthorn
    started a topic BLue ESR meter installation pre-testing
    in Equipment Usage, Soldering, Techniques, and Reviews

    BLue ESR meter installation pre-testing

    I assembled the Blue ESR meter and started to do the initial checks. The manual states to "Do not install the integrated circuits until after performing the Initial Checks". After downloading the following link and studying the information and schematic, I found that to do the "initial checks" as stated in the Blue ESR manual both IC2 & IC3 have to be installed in order to get the - LED to light on the left hand display. This is clarified by reading the old manual (see the link) on page 7 under initial checks (and is made clear by looking at the schematic). However, the...
    See more | Go to post
  • Blackthorn
    started a topic Dell Inspiron N5110 dark screen after HDD replacement
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Dell Inspiron N5110 dark screen after HDD replacement

    I am working on a Dell Inspiron N5110 laptop. The computer had a failing hard drive so I dissasembled it and replaced the hard drive. Note that with this model the entire laptop has to be taken apart. The motherboard has to be removed and turned over to where the hard drive is mounted directly to the motherboard.

    I replaced the hard drive and found that the screen is now dark. Please also note that I am very careful about static and use all the safety equipment to prevent any damage it may cause. I can direct the video to a remote monitor and everything is fine. The dark screen...
    See more | Go to post
  • Blackthorn
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    I used to do component level repair when I worked for the Naval Air Rework Facility at the Norfolk Air Station in Norfolk, Virginia. I went through the apprentice program there and was trained as an Aircraft Electrician. All of that has been closed down now for years, so now I live in California where I had gone through the electrical trade, Pacific Bell (now SBC renamed to AT&T), and several other jobs, though I have been doing computer repair for several years. I usually just repair my friends computers, so it has become...
    See more | Go to post

    Leave a comment:

No activity results to display
Show More
Working...
X