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Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe

Grzecho-k15 10905 7
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  • #1 16340044
    Grzecho-k15
    Level 1  
    Posts: 1
    Hello, I have a technical problem caused by lack of trust in the authorized LINCOLN service center. The problem is that my friend was welding with a speedtec at the highest current in MMA mode, not maintaining the operating time, which resulted in the device overheating. The welding machine was serviced in Krakow and I got it back after 5 weeks. The service center did not inform me about the costs of the service, which cost me PLN 1.5 thousand. PLN... Out of curiosity, I opened the welding machine to see what had been replaced and what did I see? I saw a screwdriver that the service technician had carelessly or intentionally left in the device. I have the impression that it was not there by accident because it was in contact with the power output to the electrode and the motherboard. After filing a complaint, the service center took it back to itself, first claiming that I had thrown in the screwdriver myself, and then after another 4 weeks I got the welder back and part of the money back... Result: I took the device apart again and what did I see? The soldered parts that were previously replaced with new ones, and after the complaint I saw damaged parts and replaced ones.
    The situation is that I would like to fix it myself this time, but I don`t know if the parts currently soldered to the motherboard are the parts that are actually in these places, i.e. the same parameters as in the original.
    My question is: can anyone help by sending e.g. photos with the markings of the elements? Thank you in advance for your help and good advice. :)
    Below are photos after visiting the website.
    Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..377.jpg (1.28 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..385.jpg (1.36 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..372.jpg (1.59 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..371.jpg (1.16 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..369.jpg (1.24 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..368.jpg (1.09 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..365.jpg (1.32 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..363.jpg (1.53 MB)You must be logged in to download this attachment. Lincoln Speedtec 200C - an authorized service has intentionally damaged my mothe2017-03-12..364.jpg (1.64 MB)You must be logged in to download this attachment.
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  • #3 16340215
    Anonymous
    Anonymous  
  • #4 19976934
    banaszakjohan
    Level 1  
    Posts: 1
    Hello, I have the same welding machine as you. The mosfet in position V121 at the top right of your first photo is broken. Unfortunately, I can't read the reference that is written on it. Could you take a picture of yours or tell me the reference if you can read it?

    Thanks in advance.
  • #5 20985397
    baki.
    Level 2  
    Posts: 2
    Rate: 1

    Hi,

    It's been a long time, but I still hope that my answer will help someone.
    V120 is IRF9540NS and V121 is IRF540NS.

    I need the value of resistor R46.
    Image of a circuit board with electronic components, where one resistor (R46) is highlighted with a yellow circle.
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  • #6 21198113
    Tnam27
    Level 1  
    Posts: 1
    Rate: 3
    Hi.

    R46 is a 15K resistor.

    Hope it helps. Electronic schematic with NCP1654 IC and resistor labeled as R46.
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  • #7 21276980
    baki.
    Level 2  
    Posts: 2
    Rate: 1
    Thank you!
    I'm sorry I didn't see the answer right away.
    Yes, it is a 15K ohm resistor.
    Could I have the complete schematic?
    There are still burnt components. Someone took off the original k40H603 and put in a FGH40N60; also, the CUG diodes are shorted.
  • #8 21765788
    mariantritescu93
    Level 1  
    Posts: 1
    Rate: 2
    Maybe this well help you guys on the bottom of the pdf is electronic diagram
    Attachments:
    • SPEEDTEC180C200C-1.pdf (2.28 MB) You must be logged in to download this attachment.

Topic summary

LABEL_AI_GENERATED
Discussion about a Lincoln Speedtec 200C welding machine that was returned from an authorized service center after overheating damage and a complaint about a screwdriver allegedly left inside the unit. The thread then shifts to repair diagnostics: identification of relays, high-power resistors, electrolytic capacitors, and failed MOSFETs on the control/power board. Later replies provide component references for V120 and V121, the value of resistor R46, mention replacement of a K40H603 device with an FGH40N60, shorted CUG diodes, and a schematic diagram from a PDF.
AI summary based on the discussion. May contain errors.
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