Syncmaster 2253lw inverter "not turning on"

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

Thanks guys, that power supply board is not worth repairing as I found that also out one of the inverters is bad as well = comes out to too much $$ and effort and just makes no sense to me.

Cheaper for me to find a used or new working power board as eBay has some for $2x.xx shipped.

[Jasgriff]

Re: Syncmaster 2253lw inverter "not turning on"

Yeah definitely don't give up on it as its unlikely that it cannot be repaired.

As retiredcaps says we need as nice clear picture.

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

I screwed up taking out a mosfet that it took the trace of a leg off the PCB.

Post a clear picture of the back. It might be possible to bridge the pins if depending on what you lifted OR you can install a jumper wire to another component.

What is the part number of the mosfet?

http://www.circuitrework.com/guides/6-1.shtml

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

After back and forth for a couple of weeks the repair of this monitor is dead! I screwed up taking out a mosfet that it took the trace of a leg off the PCB.

I'm so ticked off!

Thanks for the help till this point - I really do appreciate it.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

I replaced the fuse and now it's totally dead even though the fuse checks out before and after the installation.

Sounds like this monitor doesn't want to work for me.

Time for mosfet check.

EDIT: Okay tested the mosfets and one is shorted - fun fun fun! lol!

What would I do without a multimeter? I know, I would've given up already.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

I should have mentioned that since the fuses are only 45 cents, you might as well get 2 or 3 in case it blows again.

Good idea for sure.

Well I have a donor one (that I just realized I had laying around) that I'll use to see what happens from an old power board of a crappy monitor which same rated fuse checks out.

If it works I'll await my next cap order to order these and with me finding things that will be soon.

Just today I repaired a 20" Samsung monitor by replacing all the caps - of course that now works fine and which I won't personally use but the 22" (2253lw) that I want to work for me doesn't - lol!

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

Thanks, we both must have posted at the same time so I missed them.

I should have mentioned that since the fuses are only 45 cents, you might as well get 2 or 3 in case it blows again.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

See posts #24 and #25.

Thanks, we both must have posted at the same time so I missed them.

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

Can you please give me a suggestion?

See posts #24 and #25.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

A good fuse should measure less than 1.0 ohms. If the ohms reading keeps increasing, then that fuse is bad.

I know that the photo above is "lousy", but if you see that "long" green fuse by the cap on the right by the inverter in that photo is the one that failed.

Now where to get one - can't find it as maybe I'm searching wrong.

Can you please give me a suggestion?

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

Sometimes fuses die due to fatigue. Sometimes not.

Post a clear focused picture of the backside of the power board. Usually there are some mosfets. If they are shorted, they may have taken out of the fuse.

See section on mosfets for how to test

https://www.badcaps.net/forum/showpo...4&postcount=19

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

The "longer green" fuse (125v F4 0AL) by the inverters has no continuity and the ohm number keeps on going up and up and up.

45 cents at digikey.com

http://search.digikey.com/us/en/prod...1018-ND/614953

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

So am I correct if testing a fuse on ohms if the number keeps on increasing means the that fuse is no good?

A good fuse should measure less than 1.0 ohms. If the ohms reading keeps increasing, then that fuse is bad.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

Okay, today I received the caps and multimeter.

Replaced remaining caps and STILL doesn't work. All I get still is the solid blue power light.

However if I tested the fuses correctly using the multimeter one of them is no good.

The "button" fuse I tested its continuity and ohms checks out at "0" - it dropped to that.

The "longer green" fuse (125v F4 0AL) by the inverters has no continuity and the ohm number keeps on going up and up and up.

The diodes are fine for continuity in the one direction as it should.

So am I correct if testing a fuse on ohms if the number keeps on increasing means the that fuse is no good? Please correct me if I'm mistaken, but in my research think I'm correct. If that fuse is bad I hope it's easy to acquire as I never ordered such.

Thanks

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

See my fellow Canadian's 5 minute tutorial

http://www.youtube.com/watch?v=bF3OyQ3HwfU



For each value above, go to digikey.com type the following into the search field.

10uf 50v fr

If no stock, try

10uf 50v fm

If no stock, finally try

10uf 50v fc

FR and FM are the preferred choice. If neither are available choose, FC. All are made by Panasonic and are good quality low ESR caps.

Will do! Can't thank you enough!

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

I've never used one

See my fellow Canadian's 5 minute tutorial

http://www.youtube.com/watch?v=bF3OyQ3HwfU

2 x 10uf 50v
1 x 47uf 50v
1 x 100uf 16v
1 x 470uf 25v
2 x 1000uf 25v

For each value above, go to digikey.com type the following into the search field.

10uf 50v fr

If no stock, try

10uf 50v fm

If no stock, finally try

10uf 50v fc

FR and FM are the preferred choice. If neither are available choose, FC. All are made by Panasonic and are good quality low ESR caps.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

Most DMM's with cap meter function will not be able to read large value capacitance, you should get the real cap meter with ESR function instead.

Thanks!

Measuring capacitance is not as useful as being able to measure ESR (equivalent series resistance). NO multimeter can measure ESR. You need a standalone ESR meter to measure ESR. Unless you will go in the repair business, investing an ESR meter has a long payback period as they start at $65 or more. Replacing caps "blindly" costs a lot less than $65.

If the 34XR $10 deal were still active, the 34XR can measure capacitance up to 4000uF. For your purposes, the DMB9 will work fine.

The Fluke 110 series can measure capacitance up to 10,000uF, but getting one used off ebay will probably cost $75 to $100.

edit: Hmm, second thread where budm is typing faster than I am!

Okay then, I shall order the DMB9.

Thanks so very much for educating me on multimeters and such as I've never used one hence the "beginner" type questions on them.



My new "problem" I'm having is finding a place that has good branded low esr 105 degree caps in these values:

2 x 10uf 50v
1 x 47uf 50v
1 x 100uf 16v
1 x 470uf 25v
2 x 1000uf 25v

Newark, Digi-key, MCM Electronics and such seem sell some which have no indication if it's low esr on any of the good brands and I only find the Chinese garbage ones that state low esr 105 degrees.

Nick

[retiredcaps]

Re: Syncmaster 2253lw inverter "not turning on"

I may have missed this (because I'm so tired right now lol!) but I don't think this is capable to also measure capacitance.

Measuring capacitance is not as useful as being able to measure ESR (equivalent series resistance). NO multimeter can measure ESR. You need a standalone ESR meter to measure ESR. Unless you will go in the repair business, investing an ESR meter has a long payback period as they start at $65 or more. Replacing caps "blindly" costs a lot less than $65.

If the 34XR $10 deal were still active, the 34XR can measure capacitance up to 4000uF. For your purposes, the DMB9 will work fine.

The Fluke 110 series can measure capacitance up to 10,000uF, but getting one used off ebay will probably cost $75 to $100.

edit: Hmm, second thread where budm is typing faster than I am!

[budm]

Re: Syncmaster 2253lw inverter "not turning on"

Most DMM's with cap meter function will not be able to read large value capacitance, you should get the real cap meter with ESR function instead.

[nickt1862]

Re: Syncmaster 2253lw inverter "not turning on"

The 34XR $10 deal is long dead. This was the original deal 2 months ago.

https://www.badcaps.net/forum/showpo...02&postcount=8

@nickt1862, what is your budget for a multimeter?

If you don't mind buying off ebay, this is a decent deal.

$12.47 + free shipping for a Meterman DM9B (I have the predecessor to this one)

http://www.ebay.com/itm/110642474359

The DM9B will certainly be more than adequate for troubleshooting and a good overall tool.

Thanks sooooo much for trying to help me in acquiring a multimeter.

I may have missed this (because I'm so tired right now lol!) but I don't think this is capable to also measure capacitance.

I'd be willing to spend a tad more to have that additional feature with what the DM9B already can do unless it can do this as well.

Thanks again,
Nick