[TechAssist] Re: Magnavox, Ch# 25S103, dead, M# HD2502
- From: Richard Lsa Placa <continentaltv@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 14 Oct 2002 18:55:42 -0700 (PDT)
Hi Daryl
Q400 is the regulator---npn #483513047072
Q402 is the pwr on-off---npn #483513047059
Q403 is the 9 volt reg--npn#483513047059
Q 410 is the 5 volt reg--npn#483513047051
Richard Lsa Placa <continentaltv@xxxxxxxxx> wrote:
Hi Daryl
The parts seeker says R408 is 100 ohms 1/8 watt. There is no R410 listed there.
I will look on the schematic tomorrow at the shop.The only tricky thing I found
about these S1's is if you get a cracked joint on the The reg transistor on the
heat sink , the str30130 will get hot and short out and take a lot of parts
with it. Make sure to change C 432. it will let a strong horizontal pulse in
the power supply and wreck everything too.(you are going to find some small
transistors shorted now)
HTH
Richard
Continental Tv
continentaltv@xxxxxxxxx
D Thunhurst
wrote:
Hi,
I have this Magnavox with a 25S102 chassis that came in dead. I checked the
semi's and esr'd the electro's. I had 167 volts raw B+ and only 16 volts
out of the regulator. In checking the resistors, I found R407, open (100
ohm). I replaced it and didn't find anything else bad. I plugged the set
in and turned it on and bang, boom and smoke.
The resistor I just replaced, R407, along with Q400, Q402, Q403, Q410, R408,
and F401 all went bye bye. Previously all but R407 were good. R408 and Q410
are burned beyond recognition and I have no idea of their values.
Resistances of IC430 (STR30130) checks the same as a new one and the HOT is
not shorted.
Has anyone encountered this before and have an idea where to go from here?
I do not have a schematic on this one.
Thanks for you help,
Daryl
Daryl's TV
3310 Dyer St.
El Paso, TX 79930
915-565-9184
915-564-1024 Fax
http://dynacomp.freeyellow.com
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