Re: Samsung Syncmaster 914v



It is indeed a 1 on the left side, glad to hear the transistors/transformers are okay. If they were bad, I might just elect to replace the whole board altogether as I'm not very confident in my ability replacing components with large quantities of leads and/or leads grouped very closely together.


Also, I checked the diodes ZD101 and ZD102 using the diode test setting on my meter. ZD101 read 1865 with red on positive and black on negative lead, 533 when reversed. ZD102 reads 1867 and 660, respectively. I admittedly...

Re: Samsung Syncmaster 914v

Hey again folks, sorry for yet another delay, I did indeed get that job and have been prepping for the move and have been neglecting my poor monitor

I had to test the startup capacitor from the other side of the board, as I can't get at the negative lead from the top. I had my lovely assistant hold it vertical and avoid grounding any components, but to get it in this position I had to disconnect it from the other board. I also still have the jumper disconnected from before, so that it doesn't reset itself constantly.

The capacitor...

Re: Samsung Syncmaster 914v

Well, sorry about the wait, guys. Got back into town and went straight back out again with the girlfriend to visit with her family, got back from THAT and have spent the last couple days working through some computer issues of hers. I [I]did[/I] manage to pick up a meter, and now that I've got a minute, I'm putting it to use!

I'm testing the two transistors for shorts, for U204 I'm seeing about 8.6M ohms between pins 1 and 2, and nothing within range (20M) between pins 1 and 3, and between pins 2 and 3.

For U205, it's about...

Re: Samsung Syncmaster 914v

Another good call, folks, I had checked for a non-backlit image before when it was still powering on/off, but I hadn't thought to once you had me disconnect the jumper. It is indeed there, so it looks like the damage is all but solved, if not the underlying issue.

Also, selldoor, are you referring to the long, narrow board along the top of the case? It's pretty much entombed under some plastic sheets held down with heavier glue than the one that was on the power board, but if you still need a close look at it, I can try and liberate it....

Re: Samsung Syncmaster 914v

Seems like a pretty good call, freed one end of the jumper (making sure it couldn't contact anything) and closed it up, and just as you said, power LED stays on, doesn't seem to be "power cycling", and of course, no picture.

Is the likely issue the inverter transformers (TM-130's) then? Are they the ones whose windings, if they're still good, typically show a similar resistance to one another, something in the 1000 range?

Re: Samsung Syncmaster 914v

Thanks again for the reply;

I was able to see between the board and the panel behind it when it was positioned exactly as it's typically seated, and the leads have a generous amount of space left, so I'm leaving them alone for now.

I tried to get a solid picture of the board, this time in another room where glare isn't as terrible. Really close shots were casting an unavoidable shadow on the board so I had to back off and zoom a little.

And aside from simple common sense, I knew from reading certain posts here...

Re: Samsung Syncmaster 914v

Thank you very much for the reply!

Once I get back next week, it's very likely I'll replace the rest of the caps, assuming I haven't found anything else to suspect as the cause.

I tried to get some half-decent shots of the underside of the board, there's a plastic cover adhered to the board underneath the transformers so focus/glare were a bit of a nuisance there.

I didn't see anything that struck me as a cold joint on the transformers, however I noticed something I hadn't before, the last two pictures are attempted...

Hey all, I've been coming across this site's forum while trying to solve this problem and I've hit a dead-end, it seems.

I have a Syncmaster 914v, manufacture date Oct '05, that I've used for over six years now and has finally developed an issue.

I turned my monitor on one morning and it began blacking out for a few seconds at a time, similar to how it would if it were changing resolution. It started out several seconds apart and lasted under a second each time, but over the course of 30 seconds or so, it blacked out with increasing frequency until the picture ceased...