| Electronics > Repair |
| Help identifying blown IC |
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| xavier60:
I'm assuming the 2nd pin down on the transformer connects to R8 and R13, so something from the LNK623-626 LinkSwitch-CV Family should be suitable. My main experience is having replaced hundreds of blown LNK624DG on washer controller boards for the last 10 years. I soon discovered that using the LNK626DG as a replacement greatly improved reliability. The higher numbered variants have higher peak current so there is some risk of transformer saturation but never occurred in my situation. Also, a small percentage of transformers get damaged by the high current surge during the blow-up. I can pick them by checking primary resistance as it is already known to me. |
| Kaar3l:
--- Quote from: xavier60 on September 14, 2024, 12:38:02 pm ---I'm assuming the 2nd pin down on the transformer connects to R8 and R13, so something from the LNK623-626 LinkSwitch-CV Family should be suitable. My main experience is having replaced hundreds of blown LNK624DG on washer controller boards for the last 10 years. I soon discovered that using the LNK626DG as a replacement greatly improved reliability. The higher numbered variants have higher peak current so there is some risk of transformer saturation but never occurred in my situation. Also, a small percentage of transformers get damaged by the high current surge during the blow-up. I can pick them by checking primary resistance as it is already known to me. --- End quote --- Thanks! I ordered LNK626 and estimated time of arrival is 19.09.2024. When I receive it I will report. |
| Kaar3l:
--- Quote from: xavier60 on September 14, 2024, 12:38:02 pm ---I'm assuming the 2nd pin down on the transformer connects to R8 and R13, so something from the LNK623-626 LinkSwitch-CV Family should be suitable. My main experience is having replaced hundreds of blown LNK624DG on washer controller boards for the last 10 years. I soon discovered that using the LNK626DG as a replacement greatly improved reliability. The higher numbered variants have higher peak current so there is some risk of transformer saturation but never occurred in my situation. Also, a small percentage of transformers get damaged by the high current surge during the blow-up. I can pick them by checking primary resistance as it is already known to me. --- End quote --- Thank you! Soldered new chip in place and checked with multimeter and it gave 12v DC. The faulty chip the garage door opener started maybe 1 in 10 times. Now I have tested it and it started 10/10 times so it fixed the opener. :clap: :clap: |
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