Re: Samsung SyncMaster T240 - 2 seconds then black problem

Quite true PlainBill.This basic fact holds true across most engineering disciplines, be it electrical or mechanical. I used to design industrial dust collectors and the quote my boss gave me is "its not a matter of if they will fail but when". Electronics is a weak spot for me because I have focused on mechanical and CAD work most of my life. The electrons knowledge I have gained is frighteningly small considering how often I have to rely on electronic devices. I am attempting to change this now (at 40 no less)....

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Thanks Plain Bill, sorry I haven't been quicker on my follow ups. Been a week of broken cars, lost hamsters, and general mayhem. Being a single parent aint for wussies.

I re-soldered that jumper as you advised and there is still no output on 'B' connector. So this means inverter/transformer?

I contacted Samsung for a little info and that was a dead end (no surprise really). They were nice enough to get back in 24 hrs though. So no service manual, no part specs, no comparable board listing,...

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Sorry I didnt get back with my test results sooner. Fixing broken things has become a full time job here lately.

So as PlainBill suggested I swapped the connections and sure enough only one connector will make the CCFL's do the intermittent flash. I provided a modified pic to explain although its not a complicated concept.

So this means bad inverter am I right? I attached a pic of what I figured the inverter to be and its markings are:
TM-10160
TNE 0852 DT

If I am...

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I am sorry for contributing to any male pattern baldness PlainBill, being a senior member must be tough but I am glad you have taken the time on this because your comments are spot on.

I didn't know that an inverter was designed to shut down when the lamps are not drawing current.

I did learn somthing useful today while attempting to swap the lamp output lines...the housing around the power plug is hot!!



I will take another stab at it later after...

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I thought those caps looked a little suspect. There were other signs that the case had been cracked after factory like masking tape on the back plate to hold down wires. I hope that I have not purchased a total dud that I just cant fix but it seems that the last person was a tad careless so maybe they just missed something simple (I hope).

The 2 connections from power board to lights are shown here connected. Basically its just 2 cables that have 4 wires each and they connect to 4 CCFL lights in the screen...

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Glad I found this post! I am a noob with the same exact monitor and problem. Hope we can take this post all the way to showing a completed fix.

I bought mine on e-pay and it was claimed to have a blown backlight. I picked one up on LCD parts net before digging into the monitor case assuming it would be a plug and go fix. That was an extremely dumb assumption!! Turns out it uses 4 backlights (2 top and bot) and after seeing the power board I could tell that it was probably failing there and not at the lights....