Question about Zenith A32B41W 32" TV
I have a Zenith A32B41W TV, Circuit PCB 9-2003. I discovered two bad 1000pf/2000v caps, CX3220 (fried) and CX3231 which I have purchased replacements. But I also discovered what looks like some type of ground fuse or plate (EX3401) next to the AC Input that has definite visible signs of arcing/damage. Should I replace this? I was reading a similar post and it discussed finding the root cause, which I did, but it did not mention replacing this. If so, what is the part# and where can I find it? Also I discovered a loose component (THX3415). It looks like a silver disc (the loose part) sandwitched between two wire leads. This component is in the same section of the PCB. What is this? Some kind of thermal component? I am assuming I need to replace it as well. Any part number and place I can purchase? I cannot locate a schematic for this board. Any help is appeciated. Arnie
The 1000pF 2KV caps in the Zenith sets are notorious for burning up. I have seen it many, many times. The ground "plate" you describe is a dual spark gap, between the tuner ground and each side of the AC line. This part literally does nothing until a bolt of lightning hits very close to your house. Even if it shows signs of arcing, it is still good and does not need to be replaced, unless it has melted into a blob of goo and that never happens. The silver part you describe is the degaussing thermistor. It only works for the first half-second when the set is turned on, demagnetizing the picture tube. If you do not replace the thermistor, it is possible that when you move the set you will see that the colors are not quite right in the corners of the picture. If you are careful you can solder the legs back onto the thermistor, but they love to crack when heated with a soldering iron. Bring the broken one to your local TV shop and they will most certainly have many new ones in stock.
Posted on Aug 19, 2007
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