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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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hi there!
to those who encountered pincushion size problem on aoc model: 5en. (i've posted my problem last week) . After replacing flyback, it suffered from bad pincushion. Traced the E/W output pin (pin 24) deflection IC - TDA9115. It goes to the base of a small transistor (Q404). Traced from its collector and found Q406. Q406 has collector & emitter short. When someone there encounters this problem, look at those components especially Q406 and also check coils & other components connected to its collector. Check also if there is a signal coming out on pin 24 of the said IC. My problem this time is the other set that has a very low heater voltage when the crt board is inserted on the crt base. It causes the heater not to glow. I found out a zener diode connected to the filter cap. I'm going to check if is still regulates properly. Thanks to this group. I found related topics at the archives for my query regarding this model. |
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