[TechAssist] Fixed: Samsung TXN2771HF dead blown HOT
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 11 Mar 2005 19:23:20 +0000
The TDA6111Q came in for IC503 and it worked so the set is behaving itself
right now.
Final parts tally:
Flyback
HOT
IC503
L502
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Samsung TXN2771HF dead blown HOT Update
Date: Sat, 05 Mar 2005 21:47:42 +0000
Almost there 1 more part to replace:
Have Replaced:
HOT
Flyback (the old one rang in the 20's the new one in the 40's)
L502 (220V supply on CRT board)
Will need to still get:
IC503 (TDA6111Q) -shorted-smoked
After repacing flyback and HOT set came on with sound but with a bright
white-retrace raster
The Volatge on the Screen measured low (still does) and the cathode voltages
were only 13V
Traced that supply to L502 33uh replacing it caused smoke to curl up from
IC503 removing IC503 and replacing again L502 gave a picture (less blue
since it is the blue drive)
Thanks to those who have helped with schematics & parts
Peter Oliver
Tucson Radio TV
From: Al Gutz <alg@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Samsung TXN2771HF dead blown HOT
Date: Sun, 30 Jan 2005 20:52:24 -0500
Peter
The 32" version of that chassis uses KSD5703. Likely fly is bad also,
use a sd1880 to test. Under warranty they also recommend replace the
horz drive transformer.
Al G
Al's TV-Electronics
Pembroke Ont.
Canada
Peter oliver wrote:
> Samsung
> TXN2771HF
> service # TXN2771HFX/XXA
> MFD Oct 2003
>
> Set is dead. HOT is blown. It is marked J6920 with fairchild
> logo. It has the large case like a TO3PL although with fairchild it
appears
> to be TO-264. (same case size as 2SA1302). From that it appears to be a
> FJL6920 which is rated at 1700V 20A 200W. Didn't get a chance to pull
the
> fly (was a short day today) but if it is arcing wouldn't show on a ring
> test. CRT does not appear to have a HK short and B+ comes up without HOT
> present. Any idea where I can get a low cost generic version of this
> transistor (in the event of a non testable arc) or any known failure
> scenerios?
>
> Peter Oliver
> Tucson Radio TV
>
>
>
>
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