[TechAssist] Re: Samsung TXK2754 with repeat horizontal output failure
- From: "Webster TV" <webstertv@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 17 Feb 2004 12:56:36 -0600
Bob,
Did you check the horiz. driver transformer for poor solder connections?
Have run into this on numerous different brands, the unit will run perfectly
until the connection opens up and then the H.O.T. will short immediately.
Just a thought if you haven't checked this.
Dan Webster
Webster's TV
Shullsburg, Wi.
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 16, 2004 7:04 PM
Subject: [TechAssist] Samsung TXK2754 with repeat horizontal output failure
> I currently have a Samsung TXK2754 that was serviced by another servicer
in
> the past about 4 or 5 times for a dead set according to the customer (she
> recently moved into my area). I found the horizontal output transistor
> shorted and this had been replaced by the other servicer (I could find no
> evidence that any other parts had been replaced at any time). I ordered
> parts directly from Samsung and installed them this past Thursday and the
> set ran continously until at least 1pm on Saturday when we closed (I came
in
> this morning and found the unit dead again with the output transistor
> shorted again). The B+ was rock steady at 135 volts, the horizontal
waveform
> was perfect, and the set was looking good prior to dying again. Here is
the
> list of parts I replaced:
>
> Q401 (HOT) (KSD5703, Samsung # 0502-001136
>
> T444S (Flyback) (FUH-29A001A, Samsung# AA26-00013A)
>
> D805 (135 V rectifier) (F10U60S, Samsung# 0402-001358)
>
> Does anyone have some suggestions as to why the HOT keeps shorting (and it
> is "normally" cool with no signs of overheating)?
>
> 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
>
>
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