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Equipment Repairs => LCD TV forum => Topic started by: Turnip on September 25, 2011,08:10:09

Title: Samsung LE19B450C4W
Post by: Turnip on September 25, 2011,08:10:09

Hi folks,

Have one of these that makes the usual start up Fa/Da  - screen briefly lights with OSG then nothing, not even the S/by led.    Set appears to be in sulk mode and ignors control.  PS voltages remain at 5V and 15V.

Guess it might be in the inverter area but transformer secondary ohms are identical and caps look OK.

Any thoughts ?  - Thanks - Chris.

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 17, 2012,08:56:07

hi
chris got one the same did you manage to cure the fault
or did you change the psu/inverter
dave

Title: Re: Samsung LE19B450C4W
Post by: Turnip on February 17, 2012,09:01:28

Hi Dave,

Couldn't find any bits so gifted by cust and on the heap pending - Chris.

Title: Re: Samsung LE19B450C4W
Post by: E Parton on February 17, 2012,11:18:59

Hi Chris ..
Recognise that invertor transformer ...and is known to be a troublemaker ..
Had a few burn/arc internally..but read ok cold
In the old days I would quote for a new pcb ..
but ..I think CHS now stock the transformer on its own ..
rgds
Evan

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 17, 2012,12:11:20

hi
chris do you still have panel if so could do with inverter
 transformer
thanks dave

Title: Re: Samsung LE19B450C4W
Post by: Turnip on February 17, 2012,12:31:19

Hi Dave,

Our Evan doesn't yet give order details - hanging on to that panel/set for the retirement pound - Note that ChasHyde seems to have the the tranny - Chris

Title: Re: Samsung LE19B450C4W
Post by: E Parton on February 17, 2012,13:02:45

Quote from: Turnip on February 17, 2012,12:31:19

Hi Dave,

Our Evan doesn't yet give order details - hanging on to that panel/set for the retirement pound - Note that ChasHyde seems to have the the tranny - Chris

Sorry Chris ...
Didn't have a scrap board to hand to reference the transformer number ..
All I could remember ...top of the head...was that I recognised the transformer and had previously obtained one from CHS (ChasHyde)..
rgds
Evan

Title: Re: Samsung LE19B450C4W
Post by: Turnip on February 17, 2012,13:42:33

Wicked - Evan,

Some old folks have nothing better to do but to try get details.

Must get a secondary life of sorts, but as a humanist - still rather doubtful - Chris

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 17, 2012,14:03:42

hi
chris chs only supply on psu/inverter panel not on there own
dave

Title: Re: Samsung LE19B450C4W
Post by: E Parton on February 17, 2012,14:14:14

I can only appologise ...
I had it confused with this chappy

CHS pt no :- 3547177

Thats what comes of not having a panel in front of me to look at..
Chances are a special order enquiry with Jo at CHS will get results ..
The one I was thinking of was cheap enough ...but as I now realise ...is different to yours.
Sorry Chris
Evan

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 17, 2012,14:45:52

hi
look on chris pic nothing like that have
 that in stock for for this model
dave

Title: Re: Samsung LE19B450C4W
Post by: E Parton on February 17, 2012,15:06:43

Quote from: sparky on February 17, 2012,14:45:52

hi
look on chris pic nothing like that have
 that in stock for for this model
dave

As I said ..I appologise for getting his hopes up ..
I honestly thought I recognised the transformer ..
Since I didn't actually have a board in front of me ...I just assumed... wrongly I admit...they were one and the same.
It is well over 6 months since I saw one ...and my memory ain't as sharp as it once was.

had to do some digging on past CHS orders to come up with the one I thought it was ...and the photo.
In future I'll keep my gob shut ..unless I'm 100%
;)
rgds
Evan

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 17, 2012,15:44:31

hi
thanks for looking
dave

Title: Re: Samsung LE19B450C4W
Post by: Turnip on February 18, 2012,10:49:15

Hi Dave,

Note that some of these trannies are pin similar - some are even cheap. Haven't yet checked secondary resistance of my Sammy, but bet as you have one, you have.

Have a small pile of NYD741FC  - fits  Samsung LS 22TDVSUV/EN (4 tube set) 700 Ohm dual secondaries.

Just a thought - Chris

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 18, 2012,12:37:44

hi
chris ordered new panel
dave

Title: Re: Samsung LE19B450C4W
Post by: Turnip on February 18, 2012,13:01:37

Hi, Dave,

Wot - no secondary resistance info, and you always unhappy about Quuq non-info - no gong for you, quite yet, I guess - Chris

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 18, 2012,13:50:38

ih
its prob not inverter transformer thats causing the fault
borrowed transformer still no backlite so tried
borrowed psu/inverter pcb with my transformer fitted
works ,put in original pcb faulty
got new panel coming at a very good price
dave

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 18, 2012,13:53:03

hi
chris
 FAULT CURED BY REPLACING INVERTER/PSU WITH NEW PANEL
DAVE

Title: Re: Samsung LE19B450C4W
Post by: sparky on February 20, 2012,06:42:21

hi
chris posted cured ok
dave