samsung 2494LW 2-3 sec cclf light off

[majkstone]

Hello new in the forum hello to all.
Read lots of post with 2-3 sec death on LCD monitors nbefore decide to make my post.

So all caps are ok on
trafo desoldered and mesuring resistance s1-s2=960ohm s3-s4=1080ohm
ther is 13V 5V and 3.3V from inverter board here no problem.
mosfets 4512 SMD 8pin try to test on board they are not in short but diff to check without desoldering (by measuring seem both ok also not overheating)

I am shure i have problem with feedback current to the main IC1 chip from CFL lamps to IS (pin4) and FB and VS pin 3 and 5
using this sch of BN44-00296 but my board is BN44-00297D
Anyone have the inverter sch of the BN44-00297D please post will help alot.
SO this are mesurements form BD9893F

Pin 0n V 0ff V
1 1.38 0
2 1.35 0
3 1.26 0
4 1.24 0
5 0.44 0
6 0 0
7 4.5 4.5
8 1.4 0
9 0.85 0.61
10 1.9 0
11 2.8 0
12 1.8 0
13 2.25 0
14 0 0
15 2.3 0
16 9.3 9.44
After while find solution to alter resistance from pin1 to gnd
originally 33k+270ohm from pin1 to gnd remove 270ohm replaced with 10k trimmer monitor works...
But after intense testing i get overheating of the four 56K resistors in serial (all together 224 kohm) connected on the sec of hi volt transformer beetwen s1 and s3, resistrs are in SMD
Can i replace all them four with one resistor of 220 kohm about 1w or 0.5W?
seems the problem is the difference more than 3% of the two secundars from hi voltage trafo for ccfl lamp am I right ?
Any suggestion for a fix without replcement of the hi voltage trafo?

Regards hope here soon from someone https://www.badcaps.net/forum/images/smilies/compy.gif

[selldoor]

Re: samsung 2494LW 2-3 sec cclf light off

trafo desoldered and mesuring resistance s1-s2=960ohm s3-s4=1080ohm


seems the problem is the difference more than 3% of the two secundars from hi voltage trafo for ccfl lamp am I right ?
Any suggestion for a fix without replcement of the hi voltage trafo?

You are correct you will need to replace one or both of the inverter transformers.
There is no fix.