[TechAssist] Re: RCA 35" G35830WK, CTC169JA5 HOT shorted again after sweep kit,etc
- From: "repair1" <repair1@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 18 May 2004 14:41:37 -0500
Phil, when it comes to power semis, I do not use sk or nte. several years
ago I bought a batch of SK 2SD1885's, and not a one of them worked properly
in any chassis I put them in. I only buy those devices from Prelco, Nesco,
or B&D, hth.
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, May 17, 2004 3:47 PM
Subject: [TechAssist] RCA 35" G35830WK, CTC169JA5 HOT shorted again after
sweep kit,etc
> 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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