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The Samsung SyncMaster 245B is a 24-inch LCD (liquid-crystal display) monitor with a TFT (thin-film transistor) active matrix.

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Do I need a power supply or inverter recap?

**Due to the condition of the panel (black spots from wet storage), I do not plan on spending a lot of money on repairs for this monitor - $20 max with margin of error. As much as I like 1920x1200 16:10, it isn’t worth spending a lot on a monitor with panel damage :(.**

After this monitor is on for a few minutes, the unit has a audible hum - a dead giveaway for bad capacitors. I have ordered 35V 220uf capacitors for the inverter to see if that fixes the issue, but if this doesn’t, what should I focus on that’s cheap? The capacitors on the power supply look okay, so I don’t think it’s those although I do suspect it having experience working on multiple monitors I was given in the past that tell me it probably is. If I let it run for a while it clears up and goes nearly silent, but it's still an issue.

If it is the power supply caps, is it okay to ignore the AC side and just focus on the DC parts of the display? It usually is safe to do so in my experience, but I have yet to do it on a monitor with more then 2 CCFL connectors - this has 6.

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In addition to those checks, I did run it without the inverter connected to the power supply and it was more or less gone at the same time I was checking it out to isolate the fault - hence why I’m working on the inverter first.

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I tried cleaning the inside of the display as it was a dirty disgusting mess with black spots in multiple places and it didn’t make it through - TAB failure. I knew it was high risk, but this was the right time to try and salvage the panel since I didn’t have much in yet.

Soon… Maybe the next try at a cheap 1920x1200 will work out. I’m still going to keep the parts that aren’t damaged but this attempt was a bust.

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@nick “The capacitors on the power board look okay  “ does not mean they are okay. The proper way of recapping is to replace all caps. You also need to check the power IC’s which ultimately can get the whole board to “hum” as well. For more suggestions we’ll wait till we see what you got going on there.

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I'm focusing on a full inverter recap because if it ends up being a worn-out backlight, it won't be too expensive of an attempt. The filter caps are usually fine, at least from the ones I've done - it's always the DC side.

I'm hoping the inverter recap fixes it, but I think it's going to be in need of a power supply recap knowing how much Samsung loves using CapXon and others of similar quality.

@oldturkey03 Board photos are posted - I just had some concerns about opening it until the internal power supply was safer to handle. I may order replacements for those resistors when I order a desoldering braid since it may be that glue that becomes conductive with age. The cap that looks lifted was so I can see what it needed - nothing bulging there.

da

A snafu got thrown into this. Yours truly forgot to get a soldering iron when I was out.

It's not relevant why here, but I don't support Amazon unless I *have* to after a certain incident and not default unless I have to (unless I can just buy the tip, as I still have the iron but it wore out).

da

Hi @nick ,

Have you got a Capacitance ESR OHM meter- examples only?

They take the guess work out of deciding whether a capacitor is faulty or not and save you the expense (and the time working out the ordering of parts) of having to buy the complete selection for the device. You only have to get what you really need

Some meters are designed so that you can test the capacitors "in circuit" so that you don't even have to remove them to test if they are OK or not.

Cost efficient if you do a lot of this kind of repair work

just an idea ;-)

da

@jayeff In this case since I get a few monitors with similar issues (or get them for next to free) I ended up getting a tester on eBay. The reluctance was due to the poor condition panel. In general my freebie/cheap monitors usually need work (and need a DVI->HDMI adapter), but a nice one may be an upgrade if a lower end one I don't care (as much) for fails. Albeit older, but as long as it's a good resolution I can overlook a lot within reason.

Normally I just do a full recap per board as needed but this thing is more expen$ive then more common monitors (1920x1080 DVI/VGA) since it needs so many/larger capacitors because of the backlight setup.

da

Hi @nick ,

The right test equipment is always useful to have if you have need to use it often. Saves a lot of hassles trying to determine what the problem may be. In this case you can quickly determine if a capacitor is faulty and therefore is a possible cause of the problem or not. If not you can move on and do other diagnostic tests on the device, instead of waiting for the replacements hoping that they fix the problem

Good luck ;-)

da

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Nick sarà eternamente grato.
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