[TechAssist] CTC203AA5, is LA7612A the same as LA7612N, weird problem with T chip
- From: Kevin <kevintv@xxxxxxx>
- To: TECH-ASSIST <techassist@xxxxxxxxxxxxx>
- Date: Thu, 11 Sep 2003 13:34:55 -0700
First a question: Is LA7612A the same as LA7612N?
Second thing: With the help of Robert and Google I now have
troubleshooting techniques for the Gemstar 4 modules with the built in
micro. I determined that the data line going into the Gemstar is low (2
volts) and the Gemstar is good. I traced the data line back to the T
chip, LA7612A, and a funny thing happened: I disconnected one leg of
R12710, and my data line jumped up to 5.2 volts (which is good). T chip
must be bad. But then, I reconnected R12710 and disconnected pin 44
(which is on the other side of R12710) of the T chip, and my data
voltage went DOWN to 1.6 volts. My clock line also went low (pin 43).
What is going on here? I repeated the above test twice to make sure I
wasn't seeing things. Thanks.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
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