DIY Ringer tester info

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  • howardc64
    Don't probe Samsung LED conector with LED tester, connect may not make contact afterwards
    by howardc64
    Samsung have been using this style LED connector for few years now



    Usually good idea to test the LEDs before opening the panel to change them. I do this without the PSU stil connected. With this connector (white one) have to jam the LED tester probes in the very narrow thin slot where the PSU blade style male prong inserts into. I've done this on many Samsungs without problem until today...

    The female terminal inside the white connector has fragile fingers that grabs onto the male blades on the PSU's black connector. If the LED tester probe spreads open...
    10-12-2025, 08:13 PM
  • Lifeisfun
    Trying to troubleshoot DDR4 SODIMM slot with slot tester
    by Lifeisfun
    Hi folks!
    I have some kind of memory problem on Lenovo laptop. I was initially able to install windows after several tries since the laptop did freeze in middle of those attempts.
    Eventually I discovered that it was related to moving the laptop.
    Later on it even stopped booting unless I pressed around the memory slot. (no keyboard LEDs only power button responds)
    If I remove the RAM I get the beeps that RAM is missing. Inserting the RAM there is silence and it will not boot most of the time. No picture.

    I removed the board got one of those memory slot testers...
    06-04-2025, 02:26 PM
  • spleenharvester
    Reverse engineering of 18650 4-channel tester
    by spleenharvester
    Hi friends

    I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board...
    05-04-2025, 02:43 AM
  • sam_sam_sam
    FNIRSI HRM-10 Internal Resistance Detector AC Lead Acid Lithium Battery Tester Review on some testing of device
    by sam_sam_sam
    https://www.ebay.com/itm/405035016711

    I got this device yesterday and did some testing on some tabbing and some incandescent light bulbs and it seems to work very well from what I can tell but how do I know how accurate the m-ohms section is what can I use to verify it accurately I also tested some li-ion battery cells and this seems to be fairly accurate because I have another tester and they seem to agree with each other

    I also checked some capacitors with it that were brand new and seem to show about what I expected to see with my blue capacitor tester so I think it...
    04-13-2025, 08:17 PM
  • Dobrowol
    Dell Latitude 3520 help with bios build/repair
    by Dobrowol
    Hello. Ive got problem with Dell Latitude 3520. After power on, no display and fan goes crazy. Standard job, I exported a clean bios from update via pfs extract.



    Steps i done and results:

    I exported a clean bios from update file via pfs extract.

    1. Build clean bios with clean ME, PMC, PCH in flash image tool.
    Result: Dead

    2. Build clean bios with no changes in ME, new PMC, PCH
    Result: Dead

    3. Build old bios with clean ME, new PMC, PCH
    Result: The same



    ...
    09-22-2023, 02:43 AM
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