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LA7830 Field Output Circuit Maintenance Summary

2013-09-22
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LA7830 is a typical field output circuit. The same field output circuits as LA7830 include IXO238CE, IX0640CE, TA8403K, µPC1378H, µPC1378H-L, µPC1488H, AN5515, AN5521, LD7830, etc. All of these field output integrated circuits can be directly replaced. However, please note that the 5th pin of LA7830, LD7830, IX0640CE, and TA8403K needs to be connected to the ground with a 39p~100p capacitor, while the 5th pin of the µPC series and IX0238CE is directly grounded. In addition, the output power of the field output circuits of TA8427K, IX0355CE, IX0948CE, LA7832, LA7833, and µPC1498H is relatively large, and can be applied to 25-29-inch color TVs, and can also replace the field output circuits of the above models. Two typical application circuits of LA7830 are given below, namely: 1. Application circuit of TA two-chip color TV (taking Sharp NC-2T as an example); 2. Application circuit of M or µ two-chip color TV (taking M51354, µPC1423 or µPC1403 as an example). Except for some special examples explained in the fault quick check table, all other examples are taken as examples of Sharp NC-2T color TV (TA two-chip).

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