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Want to replace resistors myself, but need an advice

weiyann83 over 1 year ago

based on documentation it show 2.2 1/2W J, not sure which resistor i need to replace? any expert can guide me?

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anniel747 over 1 year ago +1

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0 weiyann83 over 1 year ago

The original resistor appears as shown, and I have observed that it consistently burns R7914 and cracks IC7905. Additionally, I have replaced the 3x power boards over the past four years.

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0 JWx over 1 year ago in reply to weiyann83

If the IC cracks and resistor burns I would suspect IC failure (mosfet stuck in conducting state, leading to overheating and burning of the resistor). Maybe some overvoltage spikes? If it was the same board I would also suspect some other component failure that is killing converters - but as I understand power modules were replaced?
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0 JWx over 1 year ago in reply to weiyann83

If the IC cracks and resistor burns I would suspect IC failure (mosfet stuck in conducting state, leading to overheating and burning of the resistor). Maybe some overvoltage spikes? If it was the same board I would also suspect some other component failure that is killing converters - but as I understand power modules were replaced?
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