Sony KV-1370R broken Antenna Isolation Block

[Dave]

Greetings All,



One more post...Continued from last week .



I have an otherwise great TV with a broken F-connector. Last week I was
advised by this board to abandon the repair attempt on the antenna isolation
block, and to secure a replacement part from either MCM or a local repair
shop.



I went to a local TV repair shop, got an antenna isolation block, and put it
in. Just out of curiosity, I hooked my DMM and measured AC volts to a hard
ground. The new part seems a bit leaky. On the "repaired" TV, I measured
about 63Vac. I took a survey of the other TVs in the house and all had
undetectable voltage between the F-connector and a ground (with the CATV
cable removed). Is it possible that the TV guy sold me a lemon or are some
of these less just a little more leaky than others? Is this normal behavior
for these parts, or should I get another part from the TV guy?



Thanks,

Dave

 

[RonKZ650]

You can't simply read AC between ground and equipment to measure AC leakage.
All Hot ground equipment will measure at least 1/2 line voltage to ground. In
other words, don't worry about it.
Ron

 

[Alan Harriman]

I went to a local TV repair shop, got an antenna isolation block, and put it
in. Just out of curiosity, I hooked my DMM and measured AC volts to a hard
ground. The new part seems a bit leaky. On the "repaired" TV, I measured
about 63Vac. I took a survey of the other TVs in the house and all had
undetectable voltage between the F-connector and a ground (with the CATV
cable removed).

To measure AC leakage, "connect a 1.5K ohm, 10w resistor paralleled by a 0.15uf
capacitor between each exposed metallic part and a good earth ground". The
voltage across the resistor must be less than 0.75vac.

Also, make sure it's truly an isolated antenna input block.

Alan Harriman