[TechAssist] Re: Curtis Mathis CM27101S burt resistors

  • From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 6 Oct 2003 09:09:33 -0400

See if any of these might help:
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Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
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DAEWOO   DTQ26S1FC

Dead



The Service Bulletin Notes For The Regulator Circuit Said To Check The
Following Out Of Circuit: R818 (.33 Ohm 1w), R806 (390k 1/2w), R812 (100 Ohm
1/4w).

Failure On These Are Highly Possible Due To Thermal Runaway.  Then Test
Q805, Q803 And Q804.  To Test You Might Remove Q402 (Hot), And Use A
25w-120v Bulb Across The 103vdc And See If It Flashes.

Replace C404 1mf-160v With A 3.3mf-160v No Matter What, And Place A 33 Ohm
1/4w On Q402 Between Base To Emitter.  In My Fix I Had To Replace Q402, And
Then Added The Resistor.

The Notes I Have For Crossing These Are:
Q402 - D1880 - Nte 2353 (Hot)
Q803 - C2500 - Nte 2363
Q804 - E13009-2 - Nte 379
Q805 - C3203 - Nte 382

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DAEWOO   DTQ26S1FC

Dead - H.o.t. shorted & Fuse blown

Herman Ackerman

Q804E13009-2 (Kse13009y)  I used 2sc4834, Q805 Ktc3203 used 2sc3203 h.o.t.
2sd1880 used 2sd1879 ok.

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DAEWOO   DTQ26S1FC

Dead - H.o.t. shorted & Fuse blown

Jesse Morris

Q402, Q804, Q805, C403, C418, and F801

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DAEWOO   DTQ26S1FC

Dead No Power Up

Computer & Comm Solutions Www.Ccsinc.Com 804-642-9731

Q803 C2500 R/W Sk9453, Q804  E13009 R/W Sk10000, Q402 2sd1880 R/W 2sd1879,
Q805 C3203  R/W C3203  C404 1uf@160v Had Bad Esr

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DAEWOO   DTQ26S1FC

Dead No Power Up (All Smps Components Check Good !)

Bay Electronics Inc.

Remove R807 (47 Ohm) Scrape Leads Reinstall Or Replace R807 The Unit I Fixed
Had An Invisible Bad Joint There Due To Overheating.. What A Dog !

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DAEWOO   DTQ26S1FC

Dead.

Ford's Tv & Video Service

Open Capactor, C404 (1 Uf 160v), Shorted Transistor, Q803(2sc3203),
Defective Transitors, Q805 (2sc2500), Q804 (E13009-2), Q402 (2sd1880), Open
Resistor, R815 (0.33 Ohm 1 W).

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DAEWOO   DTQ26S1FC

Dead.

Ford'S Tv & Video Service

Open Cap, C404 (1uf 160v), Shorted Transistor, Q803(Ksc2500), Defective
Transistors, Q805(Ktc3203), Q804(Kse13009), Q402 (2sd1880), Open Resistor,
R818 (0.33 Ohm 1 W)

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DAEWOO   DTQ26S1FC

H.o.t. overheating

Daewoo Fsb 99ctv2

add a 33 ohm resistor from b-e of h.o.t.

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DAEWOO   DTQ26S1FC

H.O.T. Overheating



Here Is The List Of Things That Daewoo Told Me To Replace Or Test When There
Is Thermal Runaway In Horz Out.  They Say That This Is Good For Shutdown
After It Has Been On For Awhile.

                     Original           Replace
  Q402-        2sd1880        2sd2539>
  Q803-        Ksc2509b     2sc2355    Or   Nte2363
  Q804-        Kse!#13009   2sc3890    Or   Nte379
  Q805-        Ktc3203          2sc2235    Or   Nte2382
  Replace : C808, C404 , C410 , C414 , C413
  Check : C412 , C401 Replace If Necessary.
  Change C505 To 1000pf@100v , R420 To 1.8k 1 Watt
  Check Or Replace R516 10k Pot (Which Will Cause Pic To Narrow On Right)


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DAEWOO   DTQ26S1FC

Pix Shifted, leaving black bar on Left side

Daewoo  Svc Bulletin #99ctv1

Trimpot R516  (10k) open and D504 open due to excessive current flow. R420
240 ohm 1w r/w 1.8k-1w,C505 2200pf/50v r/w 1000pf/50v D504 1n4148.
Decakit011 contains all 4 parts

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DAEWOO   DTQ26S1FC

Q402 (h.o.t.) thermal runaway

Add 33 ohm 1/4w resistor across Q402 Base to emitter

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DAEWOO   DTQ26S1FC

Regulator problems

Robert Ford

check parts out of ckt: R818 .33-1w, R806 390k-1/2w, R812 100-1/4w,
Q805,Q803,Q804. to test remove Q402 (hot) and put 120v 25w bulb across the
103vdc supply

---------------------------------------------------------------

Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com


----- Original Message ----- 
From: "Advanced Electronics" <satguy@xxxxxxxxxxxxx>
To: "tec" <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 03, 2003 6:29 PM
Subject: [TechAssist] Curtis Mathis CM27101S burt resistors


> I have this Curtis Mathis tv that has an RCA picture tube and what looks
> like a Daweo Chassis the only numbers on the chassis are s/n 4859812791-03
> and on a sticker on the chassis is MPGT18E528-1DTQ-29S3FC. What I need to
> start with is the values of R812 and R828.
>
> Shaun
>
> Advanced Electronics
> 224 West Riverview Ave.
> Fort Morgan, CO 80701
>
> satguy@xxxxxxxxxxxxx
>
>
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