[TechAssist] Power MOSFET - Huge Flash
- From: Bil Green <tv.vcrrepair@xxxxxxxxxxx>
- To: ".TECHASSIST @ freelists . org" <techassist@xxxxxxxxxxxxx>
- Date: Fri, 29 Jul 2005 01:30:56 -0700
I replaced a shorted MOSFET (driver in SMPS) and other parts
(listed below) and as soon as the set was plugged in there was a
huge flash (arcing) observed at the MOSFET and it shorted
immediately.
There is carbon between the metal clip and the plastic front (not
the backside, and there is no crack visible in the plastic) of
the MOSFET. I don't want to power it up again until I have a clue
as to what is likely causing this (the original one didn't do
this).
I did use a TDA4605-2 (instead of -3) for U14101, and I can't
imagine this caused enough voltage (thousands?) to create this
large arc.
With less AC voltage the set probably won't start so I rather not
use this method.
RCA PTV
model P61929
chassis PTK195ST
Q101 (MOSFET) shorted
U14101 melted
R14125 burned
Replaced 3 other resistors as recommended (checked OK)
Bil
PC 1000
M-Pulse 5000 magnetic pulse generator
http://magpulser.com
Mammoth Lakes, CA
760-924-1000
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