Mangala Wijetilake from Sri Lanka
Hi Humphrey,
On these days I am reading your E-book on Troubleshooting of
TVs. It is very interesting and several
questions have arisen in my mind when reading.
It is very much appreciated if you could reply to following
questions.
1. There were some tests which have been carried out by
dummy load (250 V bulb). How do i decide the wattage of the bulb. Does it
depend on the wattage of the TV set?
No really Mangala, you can even use 40 watts, usually it is
not wise to dis-connect the B+ line and test it without the load but if you
don’t have the load in place then you can test briefly to check the presence of
voltage once the B+ load is isolated.
If you isolate the load and apply power and find the B+ has
voltage and stable then you can conclude that the primary side is okay and no
need of checking it.
Suffice to say here that this is done when you tested the B+
voltage and find it missing and when you dis-connect it you find the B+ voltage
now re-appears.