30 Nov
2005
30 Nov
'05
1:18 p.m.
On 11/30/2005 at 11:25 AM Dwight K. Elvey wrote:
Many IC's and transistors show little to no
visual
indications that they are shorted inside. I don't
know how one can find these without understanding
where the resistors are in the schematic and how
the resistors are being used.
Actually, many servicepeople rely on compiled tips for servicing.
Something like "If there's no vertical sweep, replace R302, Q401 and C213".
And with a lot of modern gear, manufacturer's schematics are almost
useless, where signals disappear into a house-numbered chip with no clue as
to the function or pinout on said chip.
I confess that I've used the Euras technical database several times. For
the $5 for a 14-day ticket, it's not a bad deal and usually makes short
work of diagnosing problems on TVs.
That being said, I agree with your statement about how burned resistors are
usually a symptom of a shorted component somewhere else.
Cheers,
Chuck