[TechAssist] Re: RCA 35" G35830WK, CTC169JA5 HOT shorted againafter sweep kit,etc
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 18 May 2004 17:13:43 -0400
My set has been running since 10am, it's 4:30 PM now. Using the OEM part.
Two of my SKs went south in this set after the repair.
Phil
repair1 wrote:
>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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--
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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