Samsung SyncMaster 2333HD flickers when warmed up.

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Samsung Display

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Duck @thequacker

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发帖于: 2023年6月9日

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Samsung SyncMaster 2333HD flickers when warmed up.

I have an old SyncMaster 2333HD (manufactured in March 2009) that is flickering around the edges of the display at a constant rate. Closest comparison I can think of is a CRT with a low refresh rate. This makes the display nearly unusable without giving me a headache. It starts after the display has been running for 15+ minutes usually but when the monitor is freshly powered on after cooling down it is fine. I have attempted to reset it, try a different DVI cable, plug it directly into my computer (it is using a DisplayLink adapter since my Mac only supports 1 external monitor) and even taking it apart and reseating all connectors. It initially started with just the top of the display but it has gone down to the bottom also. Is this the CCFL backlighting going out?

Edit: Images

Thank you.

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@thequacker your Syncmaster should actually have an LED backlight. Does this behavior change if you decrease the brightness? Pop the back cover off and see if there are any obvious issues. this sounds like bad caps or bad FET. Get some freeze spray and apply that one the components on your board. See if you can determine which part creates this. You know the drill :-) post some pictures with your question so we can see what you see.

由 oldturkey03 完成的 2023年6月10日

@oldturkey03 Thanks for the response. The flickering does not appear to change with brightness, just becomes dimmer. I will disassemble it to see if there are any bulging/leaking caps or anything out of the ordinary. From what I could find online the display is said to be CCFL (https://www.cnet.com/reviews/samsung-syn...) but I am not sure.

由 Duck 完成的 2023年6月10日

@thequacker once you have the back off and post some images we'll know more about it. It's a good monitor and definitely not ready for the boneyard

由 oldturkey03 完成的 2023年6月10日

@oldturkey03 @jayeff I have added some images.

由 Duck 完成的 2023年6月10日

@thequacker Awesome. thanks. Yes, you and @jayeff are right. It's a CCFL backlight. So it could be your CCFL's but I would also not rule out the inverters transformer circuitry on your power board. I'd check the capacitors and/or replace them with some quality caps. If nothing else it'll be inexpensive and could yield results.

由 oldturkey03 完成的 2023年6月10日

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jayeff @jayeff

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Hi @thequacker

The monitor has a CCFL lamp for backlighting, so that or the inverter circuit may be the first things to check.

Here's the service manual that may help

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Hi @thequacker

Can't find it in your images but component M0215 (Samsung 74LVC14 - 14 pin IC) controls the operation of the inverter circuit, so if you find it check the components around there and also look for dry joints on the soldering side, but don't discount the CCFL lamp/lamp connectors either

由 jayeff 完成的 2023年6月10日

@jayeff First off, I am sorry about the huge delay, I went on a vacation so I was unable to mess with the monitor. I have been looking for the 74LVC14 but this diagram is saying the component is located on the LCD display itself (M0215) but I have searched for the component on the LCD and there is nothing that is 14 pins at all. I have also searched the PSU (M0174) and the main PCB (T0077) and I can't see any component labeled as such. I have even searched with a magnifying glass for probably 30+ minutes with no luck.

由 Duck 完成的 2023年6月30日

@thequacker

I suppose it could be in with the panel.

I was only going on that the part M0215 description in the service manual on p.46 showed it as a IC-CMOS LOGIC;74LVC14,INVERTER,SOP,14P, which I think controls the inverter operation.

It has a part number of 0801-002198 which it seems is used in a lot of LCD units

由 jayeff 完成的 2023年7月1日

@jayeff It almost seems like it could be a bad connection because I have noticed if you do a gentle slap on the back it stops but I checked all connections and also looked for corrosion of any kind. I think I may just deal with it until I get enough to upgrade it. Still a good enough monitor for looking at my NAS when it is acting up and I have been meaning to get a newer 1440p one anyway. Thanks for the help.

由 Duck 完成的 2023年7月2日

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@thequacker your Syncmaster should actually have an LED backlight. Does this behavior change if you decrease the brightness? Pop the back cover off and see if there are any obvious issues. this sounds like bad caps or bad FET. Get some freeze spray and apply that one the components on your board. See if you can determine which part creates this. You know the drill :-) post some pictures with your question so we can see what you see. — oldturkey03
@oldturkey03 Thanks for the response. The flickering does not appear to change with brightness, just becomes dimmer. I will disassemble it to see if there are any bulging/leaking caps or anything out of the ordinary. From what I could find online the display is said to be CCFL (https://www.cnet.com/reviews/samsung-syn...) but I am not sure. — Duck
@thequacker once you have the back off and post some images we'll know more about it. It's a good monitor and definitely not ready for the boneyard — oldturkey03
@thequacker Awesome. thanks. Yes, you and @jayeff are right. It's a CCFL backlight. So it could be your CCFL's but I would also not rule out the inverters transformer circuitry on your power board. I'd check the capacitors and/or replace them with some quality caps. If nothing else it'll be inexpensive and could yield results. — oldturkey03
Hi @thequacker

Can't find it in your images but component M0215 (Samsung 74LVC14 - 14 pin IC) controls the operation of the inverter circuit, so if you find it check the components around there and also look for dry joints on the soldering side, but don't discount the CCFL lamp/lamp connectors either — jayeff
@jayeff First off, I am sorry about the huge delay, I went on a vacation so I was unable to mess with the monitor. I have been looking for the 74LVC14 but this diagram is saying the component is located on the LCD display itself (M0215) but I have searched for the component on the LCD and there is nothing that is 14 pins at all. I have also searched the PSU (M0174) and the main PCB (T0077) and I can't see any component labeled as such. I have even searched with a magnifying glass for probably 30+ minutes with no luck. — Duck
@thequacker

I suppose it could be in with the panel.

I was only going on that the part M0215 description in the service manual on p.46 showed it as a IC-CMOS LOGIC;74LVC14,INVERTER,SOP,14P, which I think controls the inverter operation.

It has a part number of 0801-002198 which it seems is used in a lot of LCD units — jayeff
@jayeff It almost seems like it could be a bad connection because I have noticed if you do a gentle slap on the back it stops but I checked all connections and also looked for corrosion of any kind. I think I may just deal with it until I get enough to upgrade it. Still a good enough monitor for looking at my NAS when it is acting up and I have been meaning to get a newer 1440p one anyway. Thanks for the help. — Duck

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Samsung SyncMaster 2333HD flickers when warmed up.

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