Samsung 244T ...stuck in standby

[tuk]

Re: Samsung 244T ...stuck in standby

With an aging and/or near end of life capacitor, heat (either from the monitor being plugged in and turned on or an external source like a hair dryer) will lower the esr of the capacitor. This could allow the capacitor to function thus allowing the monitor to function until the heat is gone and the system goes "cold." The monitor would only function normally at this point if the capacitors are the only issue with it. This theoretically could work, but it is by no means a permanent solution. Once "cold," the monitor would be back to exhibiting the same symptoms as it is now.

With this said, most members on this forum would recommend replacing ALL of the capacitors on the power board. If you replace just the visibly bulged ones now, you may find yourself opening the monitor back up at a later date to replace more that have failed.

that puts my mind more at ease that it's the caps.. should I use the same type of cap thats in there already ..black radials with stripe ..or is there a better type or brand to use

[tuk]

Re: Samsung 244T ...stuck in standby

no, have you been browsing Fixya LOL

when it first started failing and taking a longer time to come out of standby ..I noticed the time was considerably shortened if the window was closed and the room was warm ..if the room was cold then it took 2-3x longer to come out of standby

now the problem has worsened ..from cold start I can leave the monitor on for over 1hr in warm room and it stays stuck in standby ...but if use a hairdryer it comes of standby in 5-10mins ..so obviously heat is relevant to the problem

the psu needs to be recapped
it needs low esr quality capacitors
post a better picture of the power supply board
the reason why it got hot was bad caps, this can lead to bigger problems

no decent camera only a phone cam that doesn't allow closeups ..the pics I'v posted are the best I can get ..but those 3 caps you mention do have raised tops ..Im just wondering about the heat thing ..as ordering components is expensive here and would like to get it right first time if possible

[jayoung]

Re: Samsung 244T ...stuck in standby

yes they are rounded ..but would using a hair dryer make them work?

With an aging and/or near end of life capacitor, heat (either from the monitor being plugged in and turned on or an external source like a hair dryer) will lower the esr of the capacitor. This could allow the capacitor to function thus allowing the monitor to function until the heat is gone and the system goes "cold." The monitor would only function normally at this point if the capacitors are the only issue with it. This theoretically could work, but it is by no means a permanent solution. Once "cold," the monitor would be back to exhibiting the same symptoms as it is now.

With this said, most members on this forum would recommend replacing ALL of the capacitors on the power board. If you replace just the visibly bulged ones now, you may find yourself opening the monitor back up at a later date to replace more that have failed.

[trebo]

Re: Samsung 244T ...stuck in standby

yes they are rounded ..but would using a hair dryer make them work?

no, have you been browsing Fixya LOL
the psu needs to be recapped
it needs low esr quality capacitors
post a better picture of the power supply board
the reason why it got hot was bad caps, this can lead to bigger problems

[tuk]

Re: Samsung 244T ...stuck in standby

its not easy to tell from your pics but it looks like you have 3 caps that have rounded tops on them on the power supply board, they are just off the top right hand corner of the signal board, if I am right you will need to recap board

yes they are rounded ..but would using a hair dryer make them work?

[trebo]

Re: Samsung 244T ...stuck in standby

its not easy to tell from your pics but it looks like you have 3 caps that have rounded tops on them on the power supply board, they are just off the top right hand corner of the signal board, if I am right you will need to recap board

[tuk]

Re: Samsung 244T ...stuck in standby

ok, sorry about the pic quality..best I could do

a few changes in symptoms: the standby trick doesn't work any longer and only worked 2-3 times so maybe irrelevant ...after putting the 244t back together the power light took 5 mins to come on..havent seen this before; usually I leave in standby overnight..so it didn't like the cold start even though the monitor was working for a few hours before I took it apart ...also using a hairdryer on the top back vent is the only way to bring it out of standby now...

the 3 caps(1000uf 35v capxon) you can see in pics 14,15,16 ..are a bit swollen the large cap to the right of those looks flat

[tuk]

Re: Samsung 244T ...stuck in standby

thanks, I will take/provide some pics over the next few days

[mariushm]

Re: Samsung 244T ...stuck in standby

Open it up, post clear focused pictures of the electronic boards inside (click Go Advanced, then click on Manage Attachments and add the pictures as attachments with your next message) and we can go from there.

It could be leaking capacitors, it could be an inverter shorting out, it could be a CFL lamp... too many possibilities to go wrong without seeing pictures of the insides.

[tuk]

Hello, this Samsung 244T is about 5yrs old now and has worked perfectly until recently

before:
when the monitor powers up with no signal, the standby light( power button ) flashes green in a regular on/off sequence

pressing the power light once turns standby light off ..pressing it again turns it back to flashing sequence

once a signal is sent via DVI from the pc to monitor ...the standby light goes solid green, the word 'Digital' appears top left to show the source ..then screen comes up

top center at the back of case(where it gets hot) ..if you put your good ear close ..you can hear an almost inaudible high clean buzz/whine of sorts ...which on/offs in time to the standby light ...and goes a clean solid buzz/whine when out of standby(signal present)


now:
once signal is present..it started( over a period of weeks ) taking longer to come out of standby ..from a few extras seconds, then minutes ..but now it takes some 20-30 mins for the screen to appear

when the screen does come up ...it says 'analogue' top left ..and I have to press the source button to switch it over to digital ..even though as far as I know no 'analogue' source has never been used with this monitor

when the power light button is flashing standby ...pressing it doesn't turn it off as before ..it remains flashing

when stuck in standby if I put my ear to the vent( top center ) ...the whine/buzz sounds dirty( like a fly stuck on a window sill ) ..like its struggling to make its regular on/off in time to the standby light ..as time goes on the buzz/whine gets cleaner and more regular ..until finally the screen comes up and it sounds like it did before
--------------

these symptoms may be red herrings, but room temperature appears to dictate how long it takes to come out of standby ..and some testing with a hair dryer seems to confirm

also weirdly, on win7 if put the pc in sleep mode the day before ..the next day the monitor displays straight away, but for some reason this won't work 2 days in a row ..on the second day bringing it out of sleep gives the same old stuck in standby ....the sleep trick doesn't work on xp ...I'm a little confused how the OS would make a difference, wouldn't have thought windows would interact with hardware at this low level