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Want to replace resistors myself, but need an advice

weiyann83 10 months 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 10 months ago +1 suggested

It' a common 2.2Ω 1/2W 5% fusible resistor.

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0 weiyann83 10 months 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 robogary 10 months ago in reply to weiyann83

The resistor is likely the victim of another problem. This is the IC7905 spec.

https://www.mouser.com/datasheet/2/328/tny263_268-1512708.pdf

JWx has good ideas. Maybe it needs troubleshooting with a scope to see spikes or maybe one of the surrounding diodes has failed open.
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0 robogary 10 months ago in reply to weiyann83

The resistor is likely the victim of another problem. This is the IC7905 spec.

https://www.mouser.com/datasheet/2/328/tny263_268-1512708.pdf

JWx has good ideas. Maybe it needs troubleshooting with a scope to see spikes or maybe one of the surrounding diodes has failed open.
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0 weiyann83 10 months ago in reply to robogary

Ic i able to find from element14, but fusible resistor same spec i cant find from the element14 any alternative resistor fusible we can use?
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0 acdc90 10 months ago in reply to weiyann83

please check on the secondary of the transformer for shorts across diodes etc

it sounds like each board is less than a year old ( so not warranty)
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