Hello folks,
I came across this thread in the freelists group
and thought I'd re-post to SER.
=^^=DM
----------------------------------------------------------------------------
----
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[TechAssist] Fw: RCA projection TV- sub flyback transformer (Part#
232191)
----------------------------------------------------------------------------
----
To: "walter wood" wwood_38478@xxxxxxxxx,"Shoreline Electronics"
jstielau@xxxxxxxx,"Mouton's Electronics" moutons@xxxxxxxxxxxxxxxx,"Excel
Distrubiting" Excel1819@xxxxxx,"Ed Gaides" teltek2@xxxxxxxxxxxx,
drvcr@xxxxxxxxxx,"Charles Betzler" repair1@xxxxxxxxxxxxx,"Bob's TV"
woodman1@xxxxxxxx,"Jeff Dougherty" jeff@xxxxxxxxxxxxxxxxxx,"Techassist"
techassist@xxxxxxxxxxxxx,"Larry E." videotech@xxxxxxxxxxxx,
tvservice@xxxxxxxxxxxxx,"tvservice" tvservice@xxxxxxxxxxxxxxxxxxx,
"Ampm" ampm@xxxxxxx
Subject: [TechAssist] Fw: RCA projection TV- sub flyback transformer
(Part# 232191)
From: "Gemini Computer & TV" geminitv@xxxxxxxxxxxxxxxx
Date: Thu, 6 Mar 2003 15:20:54 -0500
----------------------------------------------------------------------------
----
Sorry to post this to so many at once, however I felt it important enough to
do so. Here is a forwarded post from Steve at HQ Electronics that may
benefit us all. Here is his excerpt:
Bob Waterman, CETŪ #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
We ordered a 232191 IHVT from Union Electronics. This was for a PTK169.
The first one we received failed to work. Many hours troubleshooting time
spent and unneeded replacement parts were installed determining something
was wrong with the new flyback. (Holly at Union again verified the part
number was correct.) Another was ordered again from Union. Again many hours
of time was spent determing that this part was also bad. This was confirmed
when a known good flyback from a working set was substituted temporarily and
the set fired up and worked beautifully. A third transformer was ordered,
this time from Andrews. (Willy at Andrews also verified we were ordering the
correct part). The part from Andrews arrived and worked just fine. All 5
transformers, the original, the one from the working set that was used as a
substitute, and all three new flybacks had the same part number on the
flyback, 2G25018 and TCE 30.0KV. All three new flybacks had the part number
232191 on the boxes. During the course of checking the transformers against
one another we discovered that apparently the 2 from Union were MISLABELED
AT THE FACTORY! They appear identical on the outside with one exception: The
two original FB's and the 3rd successful FB all had a green ink splotch
about 1/2 to 3/4 inch in diameter on them, whereas the two that did not work
had no such splotch. I don't know how significant that is. We determined
that these transformers were made to be used in the direct view chassis and
were MISLABELED AT THE FACTORY. According to the tests we performed here, it
has to do with the way pin 6 is connected on the direct view VS the PTV-- In
the Direct View CTC169, pin 6 is the low end of the Anode winding. In the
Projection PTK169, the black wire (also present on the Direct View flyback)
is the low end of the Anode winding and is connected to a circuit that looks
like it monitors beam current and limits peak brightness.
Symptoms of the wrong FB in the Proj set:
Standby is just fine. Hit PWR: Momentary Horiz drive. 200V line only goes up
to about 100 or 120V and the 26V line goes up to about 36V, as measured on a
'scope. If you short pin 4 of T4101 (Run regulator feedback) to hot ground
as per the official Troubleshooting manual, R4762 (430 ohms 1W) on the HV
Reg PCB (mounted on the H.O.T. heatsink) blows the magic smoke. This HV Reg
PCB is not present in the Direct View set.
How to test before installing the FB to make sure that you have the correct
one:
Using the Sencore VA48, Horiz SCR output, connect ground to pin 1 and drive
to pin 11. Use your scope to adjust to 10V positive peak pulse drive. Here's
the key to the test: If you measure the anode voltage using the wrong pin as
ground/common, the voltage is too low. The exact voltage is very sensitive
to the drive voltage, so comparison is the key.
Proj FB using black wire as common on 10M DMM: 220 to 230Vdc.
Proj FB using pin 6 as common on 10M DMM: 150 to 160Vdc
Direct View FB using black wire as common on 10M DMM: 150 to 160Vdc
Direct View FB using pin 6 as common on 10M DMM: 220 to 230Vdc
I'm sure you see the pattern. :'/ A cross check of the Thomson PTK169
service manual on CD vs our paper Thomson CTC169 is inconclusive as the
schematic of the PTK169 FB circuit labels the low end of the anode winding
as pin 6. The PTK169 service manual lists the replacement part as 232191. I
have wasted somewhere around 100 hours of my time, plus the time of the
other techs and the owner at HQ, plus the time of other techs here. And many
unneeded parts were installed. The customer has waited months for this set
and is not happy, and in the end it turns out it could have been back to him
in the first week of January. I'm not a happy camper. I hope this post saves
some other techs hours of wasted time.
Steve Greenfield
HQ Electronics
218 N 1st St
Shelton WA 98584
360-426-3336 (Shared phone and fax)
http://www.hqelec.com
----- Original Message -----
From: "Larry E."
To:
Sent: Friday, February 21, 2003 2:33 PM
Subject: [TechAssist] RCA projection TV- sub flyback transformer
Jason, AND everyone else, Hang onto the heat shrink tubing because
Thomson has NO Part Number for you to re-order it when you need to
splice the black wire to the HV Regulator and RCA`s 800 parts # people
have no clue what it is. Spent 1 1/2 hours on the phone with them trying
to buy it, they (parts people) finally forwarded the call to a guy in
Indianapolis that knew what I was talking about, but when you run the
part numbers off the bag(s) he sent me to Tri-Tronics, Vance
Baldwin,etc. it comes up NLA !! Larry E
Mouton's Electronics wrote:
I just got one in the other day and installed it. It came with the heat
shrink tubing as if it was meant to be a replacement for the projection tv
and yes, I did have the same result as everyone else. Open resistor and 2
shorted transistors on the HVreg board. I plan on emailing Thomson about
the
many people having this discussion and I think anyone with access to there
support site
http://www.thomsonnetwork.com do the same. Maybe they
will
take us seriously.
Jason
Moutons Electronics
----- Original Message -----
From: "al m"
To:
Sent: Friday, February 21, 2003 11:13 AM
Subject: [TechAssist] RCA projection TV- sub flyback transformer
Seems like a lot of techs are using this 232191 flyback with same problems.
Does anyone know the answer to is it the right one or not. I've seen some
say yes and some say no. Would like to know before I get one in.
al marquardt
----- Original Message -----
From: "drcvr"
To:
Sent: Friday, February 21, 2003 12:00 PM
Subject: [TechAssist] RCA projection TV- sub flyback transformer
Thanks Larry & Jeff!
The sub flyback 232191 it generates voltage way too high throu black lead to
Hv reg. PCB caused R4762 burn. Don't try to install any resistor between
black lead to red one from HV board, voltage high enough to kill 33
mega-ohms like I have tried. I have two other PTK169 in my shop, they are
newer sets, set with HV block stay near GREEN crt, took T4401 out and
install to this set it works OK. The only problem is red lead to HV Block
little bit short, so I have to drill hole through cardboard. Draw # on this
one is 2G25038-A2A and part# is 226094. Again 226094 is original or a SUB
one? Please let me know before I order. TIA
Don B.
Dr. VCR est:1994
20 Hanson Ave
Kitchener, Ontario
CANADA N2C 2E2
Tel 519-579-7112 Fax 519-579-1996
----- Original Message -----
From:
To:
Sent: Thursday, February 20, 2003 7:52 PM
Subject: [TechAssist] RCA projection TV- sub flyback transformer
Larry,
The one you did, was it a PTV, or direct view?
I know many other techs that had the same problem Don has, including
myself. I was able to patch the hole in the flyback with HV putty and it
worked like a charm. Before I patched it, I tried a flyback from a direct
view chassis and the same resistor blew. I've came to the assumption that
part is not a good number for the PTV sets. I wish more people would be
contacting RCA on this issue. They assured me I had the right part number.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
717-909-8844
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Larry E."
To:
Sent: Thursday, February 20, 2003 5:23 PM
Subject: [TechAssist] RCA projection TV- sub flyback transformer
Don, the sub is the right number, did one with the same symptoms about 4-5
months ago and ended up replacing 4-5 parts on the HV Reg. board and the HV
Splitter(205064) this will probably end up being a pricey repair so cover
your a**, good luck, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
drcvr wrote:
Hello, Techs!
I have this lightbox in for service, model#P52755ST and chassis# CTC169PA
found T4401 open wire( internal) from B+ to collector of HOT, TV is dead.
T4401 draw# 2G25018-A3A, original #200450 has been sub to 232191. I order
one 232191 and install, fire it up, smoke come out of R4762 on HV REG PCB
and 2 seconds later TV dead. I found Q4752 on HV REG. PCB shorted and R4762
open. My question is this is a good SUB of flyback from RCA? Is there any
way to get original one?
TIA
Don B.
Dr. VCR est:1994
20 Hanson Ave
Kitchener, Ontario
CANADA N2C 2E2
Tel 519-579-7112 Fax 519-579-1996
************************************************** **************************
*
Submit A Repair Tip Here, or Change/Remove your Email Address:
http://www.tech-assist.org/secure/tip/main.html
************************************************** **************************
*
For automatic password retrieval 24 hours a day, go to:
http://www.tech-assist.org and select "Lost your Login Info?".
************************************************** **************************
*
----------------------------------------------------------------------------
----
Prev by Date: [TechAssist] panasonic vcr fix
Next by Date: [TechAssist] Rca eeprom sub
Previous by thread: [TechAssist] Sears microwave 721.8965580
Next by thread: [TechAssist] Bell ExpressVU Model 2700
Index(es):
Date
Thread