[TechAssist] RCA 35" G35830WK, CTC169JA5 HOT shorted again after sweep kit,etc
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Mon, 17 May 2004 16:47:02 -0400
Came in dead with the 2SD1885 HOT shorted.
With this, my fix is usually a "scan kit" I put together including:
2SD1885
C4401, .0162/1600v, 206009
C4402, .056/400v, 200149
C4403, .5/250v, 200150 (orig was a .48mfd)
C4406, 470pf/2kv 227068
CR4401, 242907
CR4402, 243636
This usually cures a shorting HOT.
I also, for good measure, changed CR4118 and three lytics in the smps:
2.2mfd,15mfd and the 47mfd (orig. was 39mfd)
Unit powered up with beautiful picture and played OK. I reentered the
room 15 min later and dead again with a shorted HOT. Clipped HOT
collector, plugged set in ,measured HOT DC supply at collector and is
+146VDC standby, normal.
I installed another 2SD1885 (Must note that both my two replacement HOT
transistors were both "SK" series 2sd1885).
The set once again powers on with good full picture, good regulation
and sharpness.
BUT...
The HOT seems to get uncomfortably warm to touch after a few minutes.
Possibly this is what destroyed my first repl. part.
Fly's are not commonly bad in the 169's,especially in this way .
What am I missing?
The SK brand parts?
What else is there?
Phil
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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