Need help reading resistor

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  • jinu_j
    Dell 2209WA - power supply - Fusible Resistor replacement
    by jinu_j
    Hi

    I am trying to repair an ancient Dell 2209WA Monitor which suddenly shut off with a pop sound. On investigation found that one of the fusible resistors had blown. Further investigation identified multiple components as faulty because of which the fusible resistor blew. Please refer the attached circuit diagram showing the components that were found to be damaged.

    1. FR950 - blown fusible resistor - 0.2 Ohm 1W
    2. Q950 - shorted Q950 MOSFET - 650V 10A N Channel Mosfet
    3. R835 - Blown Resistor - 20KOhm SMD resistor
    4. D930 - Shorted Schottkey Diode...
    05-03-2025, 10:51 PM
  • mikey5791
    Need help to replace burned resistor in 350w atx psu
    by mikey5791
    Hi to all forum members,

    Got this faulty 350 watt atx psu dirt cheap from a local online seller as i am keen to use it as a learning tool to repair faulty power supply.
    The faulty part is quite obvious from the burn area near the 16pin KA7500 BD pwm. The fuse is still intact with good continuity.

    Upon power on ac, there is 5vdc standby power on cathode of diode D14 and about 10vdc on cathode of diode D13.(This should be the aux power to generate the 12v and 5v rail.)
    Initially i replace the two burned resistors near my marked red arrow to 200 ohm resistor...
    12-26-2024, 04:55 AM
  • MidnightRoller
    Can a resistor lose resistance after hot air?
    by MidnightRoller
    I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.

    I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors...
    02-02-2022, 11:46 PM
  • artvandalai
    What resistor ohm will work better to repair this waterpik?
    by artvandalai
    The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor https://www.youtube.com/watch?v=_J7_rV7ui1Y
    3 Photos
    01-05-2025, 04:10 PM
  • waigy
    Variable resistor potentiometer has different reading when mounted on the board
    by waigy
    In my fusion FE-402 car amplifier the gain pot is an RK097G.
    I think it is anyway, the RK097G is the closest I've found to the original with the same pin number and dimensions.
    The differences are my pot is blue and has B203 on it and the shaft is plastic with a small slot at the very end only.
    I measured the resistance and found it went from 0 up to 10k so I ordered a 10k pot.
    I then took the pot out the board and it now measured 22k.
    I tried putting it back in the board and it goes back to 10k.
    Is this normal and if so what pot should I order?
    On this...
    11-12-2024, 04:44 AM
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