Hanns-g JC199D 19" monitor cyles and restarts

[GoneGault]

I have a Hanns-g that gives a split-second flash of the display, goes dark, then repeats. The display appears to be good for the split second it appears. I have taken it apart and checked the fuse (good) and all connections (tight). The caps appear ok with none leaking or bulged. Suggestions?

[budm]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Pictures of the boards?

[GoneGault]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Sorry

[newtothis]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Can you take a close up of the main cap... showing the lead side?

[budm]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Yes, looks like C805 is leaking some kind of liquid.

[newtothis]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Yes, looks like C805 is leaking some kind of liquid.

Exactly what I am thinking.

[GoneGault]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Oooops

[budm]

Re: Hanns-g JC199D 19" monitor cyles and restarts

That is really bad!

[GoneGault]

Re: Hanns-g JC199D 19" monitor cyles and restarts

I am embarrassed; I have never seen one of the big ones go bad. I always check the small ones for bulging.
When I pulled up on the cap to read the values on it, one of the leads snapped right off!
Thanks for teaching me!

[newtothis]

Re: Hanns-g JC199D 19" monitor cyles and restarts

I am embarrassed; I have never seen one of the big ones go bad. I always check the small ones for bulging.
When I pulled up on the cap to read the values on it, one of the leads snapped right off!
Thanks for teaching me!

Hey we all start somewhere and never stop learning

Always make a point of checking all the caps visually, sometimes they show no sign of being bad on the venting side but can always leak from the lead side, Rarely do the main caps go but they are still electrolytic capacitors and will eventually die.

So there is the starting point... the symptoms certainly tie in with that cap and replacing it will most certainly remedy the fault.

Good luck

[ben7]

Re: Hanns-g JC199D 19" monitor cyles and restarts

I am embarrassed; I have never seen one of the big ones go bad. I always check the small ones for bulging.
When I pulled up on the cap to read the values on it, one of the leads snapped right off!
Thanks for teaching me!

Yep, do a search on this forum and you will find quite a few 'Elite' brand capacitors which have failed like that - and HV ones just like yours!

Replace the rest of the caps in the PSU, those icky hermei ones, and the other 'Elite' caps too!

[painiac]

Re: Hanns-g JC199D 19" monitor cyles and restarts

I have this same model monitor which started the "2 seconds to black" trick yesterday. I came across this forum while searching for the cause.

I opened up the monitor and did a visual inspection of the capacitors on the power board, but I don't see any obvious deformities or fluid leaks, except on the cylinder that's wrapped in yellow electrical tape in OP's picture.

Could someone enlighten me as to what that component is?

[budm]

Re: Hanns-g JC199D 19" monitor cyles and restarts

There are three components that are wrapped with Yellow tapes, two of them are the high voltage inverter transformer, the biggest one is the Power transformer for the switching power supply.
Can we see the pictures of your board?

[painiac]

Re: Hanns-g JC199D 19" monitor cyles and restarts

Thank you for your attention. Please see attached images. I appreciate any help you can provide.

[Lumberjack777]

Re: Hanns-g JC199D 19" monitor cyles and restarts

That's the switch mode (power) transformer. It doesn't contain any liquid. That very common to have that dried brownish gunk on top. I never really checked into what that is. Maybe some sort of sealant, or something left over from the manufacturing process. Maybe somebody on the forum knows this, but it's harmless, and not your problem.
You have a 2 second to black problem. Retiredcaps had an excellent guide on diagnosing this problem. More than likely it will either be a bad lamp (ccfl) or a bad inverter transformer. You can find his guide at https://www.badcaps.net/forum/showthread.php?t=10419 (start with post #19)