[TechAssist] Re: Samsung Mod#TXJ3678,Chass#K51A

  • From: Al Gutz <alg@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 12 Sep 2004 21:09:26 -0400

Don

  Logic would be that Q801 is open.   What about Q903 which is connected 
to Q801 B through R801.  Q903 is called a switch and gets a signal form 
IC901 pin 18. Q903 C is to be at .02V. IC901 sends +5V power on to turn 
on Q801 and IC853 If Q903 C high try grounding the collector.  Use 60 
watt bulb in place of fuse to prevent blow-ups.

Al G
Al's TV-Electronics
Pembroke Ont.
Canada

Don Hartigan wrote:
> First let me thank Bob,Ty& Eric for sending me prints for the K51 
> chassis's,however this model TXJ3678 is a slightly different 36" beast.It 
> came in DOA.The HOT=KSD5703 was shorted & ZD809=15 volt zener.I replaced 
> these & the unit will now pulse on/off.There is no 135vdc getting to the 
> collector of the HOT.This comes from the secondary of the SMPS,from 
> Q801=SFP9640.The 135 is on the base & collector but not the emmiter,which is 
> the actual B+[135] for the HOT.All the other 2ndary volts are ok & I a good 
> horz. dr. signal to the base of HOT.Tryed lifting the Vert o/p ic & the yoke 
> just incase they were loading down that line.A print of this model TXJ3678 
> would be most helpful........TIA............
> Don of HARTS-TVCR"ASC"
> 9 Robert St.,Oromocto,NB,Canada,E2V3N2
> Tel#506-357-9785,Fax#506-357-6010
> Email-hartstv@xxxxxxxxxxx  
> 
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