[TechAssist] Re: transistor
- From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 22 Jan 2002 03:45:57 -0500
Bill:
I have never seen a stk-730 IC in a CTC169 chassis. His set should use the
Chopper transistor Q4101. He needs to change the Regulator IC U4101 and
C4108.
Q4101 is Chopper transistor in power supply. The fix is:
Change C4108 which causes high bias on Q4101 (200165)
and its failure. Also replace U4101(200419). Do not sub Chopper or IC. Done
100's of these, if you do not replace IC and C4108, the set will recall in
most cases. Also change C4118 and C4102 The main thing to check is
your B+ in stand by which all of the above caps, if defective, will go as
high as 200 volts (it's supposed to be approximately 140 volts)
Perry Bower
Electric Medic
"It's Cheaper to Keep Her"
3850 Washington Road Suite 5b
Martinez, Georgia 30907
Phone: 706-8MEDIC4 (863-3424)
Phone: 706-863-3474
Fax: 706-863-2316
Website: www.electricmedic.com
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-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Premium
Technologies
Sent: Tuesday, January 22, 2002 3:39 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: transistor
Frank,
Your original Q4101 should have been a D2012, and from a quick glance at the
two spec sheets NTE2311 should have worked, so I would guess that's not your
problem, just a symptom. Check your regulator U4101, which should be a
STK730-010 and will cross with a NTE7125. Also check CR4122 and your 333k
resistor at R4110, which may be taking a quite a stress if it is your
regulator.
Hope this helps...
Bill
Premium Technologies
Ocean Park, Washington
----- Original Message -----
From: "Frank Miranda" <magicll@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 21, 2002 11:34 PM
Subject: [TechAssist] transistor
>
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> I'm working in CTC169JA5,I find in short Q 4101, and replace for NTE2311,
> thetv no working. and find CR4118 with leak, only have 7.2 volt , replace
> fornew one an voltage is ok 15.0 volt, the TV star and work for only 25
min.
> and Q4101 is blown again. Do you have answer about the transistor ? or I
> haveother problem ?
>
> Thank a lot
>
> Frank Miranda
>
> Audio Video spot
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