Sony LMD-2110W LCD monitor shuts down when warm

[zx81]

I would very much appreciate any help or guidance with attempting to repair this Sony LMD-2110W LCD broadcast monitor.

It shuts down when warm after running around 20min or so. I can only get it to turn back on by physically removing the power cable for around 1 minute. It will then run for around 10min and powers down again.

Sometimes on a cold start, I can see a little flicker in the backlight in the bottom quarter of the screen.

If required I can remove individual boards to take pictures of the back of each board.

pics attached.

zx81.

[diif]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Flickering and shutting down to heat sounds like a failing ccfl or failing connection where the wire joins the end of the ccfl.

[R_J]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Does the whole monitor shut down or just the backlight? (can you still see the image on the screen by shining a light on it) Have you checked any voltages on the G1 board plugs?
Like diff said, it sounds like a ccfl problem.

[Diah]

Re: Sony LMD-2110W LCD monitor shuts down when warm

did you consider the input signal source if they are suitable as max rev.??

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Do you also hear any arcing sound or smell Ozone?

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Flickering and shutting down to heat sounds like a failing ccfl or failing connection where the wire joins the end of the ccfl.

This is what I was afraid of. Would love to keep this monitor running if at all possible. Would it be possible to try and disconnect the bad ccfl and continue to run the monitor somehow?

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Does the whole monitor shut down or just the backlight? (can you still see the image on the screen by shining a light on it) Have you checked any voltages on the G1 board plugs?
Like diff said, it sounds like a ccfl problem.

Complete shutdown. No backlight and front green status light turns off. Can only cycle power back on by removing mains cable.

May need some help in checking the voltages in a safe manner. I'm quite a novice at testing live voltages. For example using the correct grounds.

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

The protection circuit will cause the inverter circuit to go into shutdown if it detects open connection to the CCFL, it only takes on bad lamp for the protection circuit to kick in.

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Complete shutdown. No backlight and front green status light turns off. Can only cycle power back on by removing mains cable.

May need some help in checking the voltages in a safe manner. I'm quite a novice at testing live voltages. For example using the correct grounds.

Ah, more info.

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

did you consider the input signal source if they are suitable as max rev.??

Pls explain a little further do you mean trying the sdi and composite inputs instead of the hdmi? I am feeding the monitor with a compliant HDMI signal via a Blackmagic Mini Moniter Ultra via thunderbolt to HDMI 1080p at 50hz

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Do you also hear any arcing sound or smell Ozone?

Hi budm,

No arcing or ozone smell just a sudden shutdown.

Would it be possible to terminate the offending ccfl tube and trick the ps to still run the monitor?

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

The protection circuit will cause the inverter circuit to go into shutdown if it detects open connection to the CCFL, it only takes on bad lamp for the protection circuit to kick in.

Budm is there any work around that a novice like myself can apply to keep the monitor running ?

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

"Complete shutdown. No backlight and front green status light turns off. Can only cycle power back on by removing mains cable."
https://www.badcaps.net/forum/attach...1&d=1565715023
After close inspection of the inverter board, I do not see any error feedback pin on the inverter board to tell the monitor to go into shutdown due to error on the inverter board.
Please check the Voltages on that CN801 connector when it is working and when it goes into shutdown.
Also look at the bottom side of the inverter board around the inverter transformer to see if it has any sign of over heating.

[nomoresonys]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Maybe check the underside of the boards for any cold/bad solder joints. Do the voltage checking first.

[nomoresonys]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Can you put up a better/more focused picture of the inverter board?

[nomoresonys]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Budm is there any work around that a novice like myself can apply to keep the monitor running ?

Not exactly sure what's wrong yet, you do have a multimeter yes? Do testing in post #13, testing example in second link in my signature below, don't be afraid, just be careful where you put the probes.

[petehall347]

Re: Sony LMD-2110W LCD monitor shuts down when warm

i used to have spare lamps to plug in for this sort of thing.

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Or old CFL: https://www.badcaps.net/forum/showthread.php?t=19987

[zx81]

Re: Sony LMD-2110W LCD monitor shuts down when warm

Can you put up a better/more focused picture of the inverter board?

Uploaded higher-res pics of inverter board front and back as requested

[budm]

Re: Sony LMD-2110W LCD monitor shuts down when warm

How about the Voltage readings at the inverter board connector when it is working and when it goes into shutdown?