[TechAssist] Re: Toshiba TP55F80 (TAC9678 chassis) hard shutdown
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 07 Jun 2005 07:52:03 -0400
I ordered the flyback (part # 23236508) which was a TFB3078ZD from
Tritronics but it is very different looking than the TFB3078AD that is in
the set. I was able to take some pictures of the TFB3078AD that was in the
set with the customer's digital camera and they emailed them to me. I am
attaching PDF photos of the flyback from the set. It was very difficult to
get a good picture with the label on the flyback legible enough to read but
one of them can be read if you look hard enough. There is the white clip on
the TFB3078AD which is very evident in the photos. The interesting part of
this is the service manual has the flyback labeled as a TFB3078AD on the
schematic but as a TFB3078ZD in the parts list with the part # 23236508 so
this must be some sort of error in the Toshiba system. Some one must have
encountered this in the past. I have uploaded photos of both the original
flyback from the set and the one received from Tritronics to my website.
Here are the links to see just how different they are.
http://www.geminicomputertvsecurityalarms.com/TFB3078AD_Pictures.pdf
http://www.geminicomputertvsecurityalarms.com/TFB3078ZD_Pictures.pdf
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@xxxxxxxxxxx
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 27, 2005 7:05 AM
Subject: [TechAssist] Toshiba TP55F80 (TAC9678 chassis) hard shutdown
I have a customer with a Toshiba TP55F80 that has a hard shutdown problem. I
am not a Toshiba ASC so I seldom see these and therefore not too familiar
with them and also have no service literature. The set may run between a
minute to 15 or 20 minutes with no noticeable symptoms and then it
completely shuts down with the power LED continously flashing. If an
immediate attempt to restart it is performed, the LED goes solid red for a
few seconds and then begins flashing again (no high voltage is heard coming
up). The set must be unplugged and then it will restart before beginning
this pattern again. I did remove all boards and found numerous bad solder
connections including the daughter boards. I also replaced capacitors C840,
C842, C853, and C856 in the power supply. Since it is a hard shutdown, I am
suspecting the flyback or high voltage block. Can anyone more familiar with
these give me their advice and also a service manual might be helpful as
well? Also, can someone give the correct part numbers for the flyback and
H/V block? Here are the markings from the components inside the set:
Flyback - TFB3078AD
H/V Block - TPA5007
Tritronics shows the H/V Block as a "capacitor block" with part number
24082877. They show the flyback as a TFB3078ZD (not "AD") with part #
23236508.
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@xxxxxxxxxxx
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