Learn How To Repair Electronics Without Schematics. Practical PCB Circuit Board Repair

Here is an interesting one. So a guy came into the workshop clutching a large PCB and asked me if I could fix it *urgently* So let’s look at the process of undertaking this sort of repair, working out what the different sections of the PCB do and deciding which diagnostic method is most likely to result in a successful repair. Could you have fixed this PCB? Be honest with us all in the comments, and let us know if this video helped you or gave you more confidence with this sort of repair

I work in collaboration with:
The Electronics Channel (with Carlos and Detlef)

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Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.

TEST METERS
ANENG AN8009 MULITIMETER

KAIWEETS HT118E MULTIMETER

VC480C+ MILLIOHM METER

MESR-100 ESR METER

XC6013L CAPACITOR METER

TM-902C TEMPERATURE METER

LCR-T4 COMPONENT ANALYZER

FNB58 USB ANALYZER

PCI POST ANALYZER

TL460S PLUS PCI_E ANALYZER

TOOLTOP ET120MC2 SCOPE

FNIRSI 1014D SCOPE

NPS3010W 30V 10A PSU

T12 STATION WITH M8 9501 HANDLE

M8 9501 HANDLE

YIHUA 982 Soldering Station C210/C245

FNIRSI HS-02 PORTABLE SOLDERING C210/C245

QUICK 861DW

PROS’KIT SS-331H

INFIRAY P2 PRO IR CAMERA + MACRO LENS

TOOLTOP ET13S THERMAL CAMERA METER

ET13S MACRO LENS

OPTICAL MICROSCOPE

TOMLOV TM4K AF FLEX

TL866 II+ PROGRAMMER

CH341 PROGRAMMER

NC-559-ASM FLUX

DESOLDER BRAID (I use size 8045)

HX-T100 SOLDER (0.6MM)

ESD-11 TWEEZERS

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Richard

5 Comments

  1. For completeness on your awesome video, could you post the link to the youtube video where you found the resistor value.

  2. @michaelproust7891 July 15, 2025 at 12:22 pm

    ok

  3. Waffle on

  4. Short answer 100% yes. If man made it I can fix it. It only amounts to how much energy I choose to put into something.

  5. I am surprised that you didn’t know that is a “Schiffler” sub circuit in the middle of the PCB.

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