[TechAssist] Re: Samsung Mod#TXJ3678,Chass#K51A
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 13 Sep 2004 12:58:54 -0300
Your right Al,one would think that Q801 is open.I did replace it & Q903.The
command is coming from IC901,pin 18.I retraced my steps this morning & guess
what,found part of my problem.The marking on the pcb for Q801 is wrong!It
reads BCE,should be ECB.I reversed it & bingo,I now have my 130vdc going to
the HOT collector.I now know I have a bad FBT for as soon as it is hooked up
the unit goes into shut-down.Tks again for your i/p as it put me back on the
right trail.Will order it today & post the final fix on this set[i hope]
when it arrives......regards.....
Don of HARTS-TVCR"ASC"
9 Robert St.,Oromocto,NB,Canada,E2V3N2
Tel#506-357-9785,Fax#506-357-6010
Email-hartstv@xxxxxxxxxxx
----- Original Message -----
From: "Al Gutz" <alg@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, September 12, 2004 10:09 PM
Subject: [TechAssist] Re: Samsung Mod#TXJ3678,Chass#K51A
> 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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