Extron Crosspoint Matrix Switcher, No power ##FIXED

[deezdrama]

Got this extron crosspoint 300 42 hva for pretty cheap with a known power issue.

Extron sourced third party manufacturers for the power supplies and its pretty common that the power supplies fail due to cheap/bad electrolytic capacitors.

I replaced all the caps on the output side but sadly still not powering on

Fuse is good, but output header is only putting out .5V on a couple of the headers.

I can replace/test components but not super familiar with switch mode power supplies. I was going to test the bridge rectifier or voltage regulators but dont these have a sniffer circuit that samples input/ output voltages and will fail to output if something in that circuit has a bad component?

Any ideas on where to start with this?

https://ibb.co/2Fym1Kz

https://ibb.co/NWJgB84

https://ibb.co/vsVKzsX

[deezdrama]

Well after doing some testing the input side is good, bridge rectifier working, getting 160V dc at large filter cap.
It has to be something on dc side.

I think i located an ic on the little daughter board that functions as voltage regulation, theres a couple small electrolytic caps on that board i could not reach to replace so planned to remove the little board and recap it but the damn vias just wouldnt clear. Ive desoldered hundreds of through hole components with no issues but messed with this after working a 3rd shift and was tired/frustrated and lifted all the pads.

I need to find a replacement power supply now.
Im not even sure what dc voltages the unit needs.
If its just 12,16,or 5v i wonder if a laptop power supply would work? I assume its multiple DC output voltages though.

Well that sucks.

[Konsolkongen]

I have a similar (maybe the same?) PSU that had gone bad caps that needed replacing, still worked but was noisy. Replaced all of them and now it doesn't work at all anymore. Recap was good, and I have no idea why it stopped working, I get nothing on the secondary side either. Haven't had time to investigate further.

You need to check for certain but I believe the PSU outputs +/- 15V and +5V.

[jd213]

Well after doing some testing the input side is good, bridge rectifier working, getting 160V dc at large filter cap.
It has to be something on dc side.

I have a different Extron unit (just used for RGB sync conversion), I still need to order parts but at least 2 of its big diodes and optocoupler seem bad:
https://www.eevblog.com/forum/repair/he ... p012-2p01/

Did you ever get back to that PVM that you were having trouble with? I still need to get back to diagnosing my 20L5, but it takes me more than an hour just to disassemble it, and I've barely had any full days off work in the last year...

[Konsolkongen]

Please let us know if these new parts make the PSU work

[deezdrama]

Did you ever get back to that PVM that you were having trouble with? I still need to get back to diagnosing my 20L5, but it takes me more than an hour just to disassemble it, and I've barely had any full days off work in the last year...

How do you remember that?

I sourced a new chassis board for that 20m2u but someone recapped it with chonx caps so it needs a full recap.
I moved last year and started a new job so havnt had much time either

As for the psu... I checked your link.... Seems like your on the right track. I was going to check the optocoupler on mine as well as i think it has to do with the voltage sampling feedback circuit. Luckily for you your psu seems all on a single pcb. Mine had that stupid daughter board soldered on vertically with header pins.
I dont know what the damn header pins are made of but its near impossible to clear the solder from the vias. I added fresh 60/40 and a ton of good flux and using a vacuum/motor-pump desoldering station but overworked the area it seems and all the pads lifted
This is the first time ive lifted pads on a through-hole component and pretty upset with myself. I maybe should of just used hot air but most of my stuff is still in boxes from moving.

I contacted extron and yep.... They cant even tell me what the output voltages need to be.
Id be happy to slap a meanwell ps in a box on the back but not even for sure of dc voltages needed

[deezdrama]

I have a similar (maybe the same?) PSU that had gone bad caps that needed replacing, still worked but was noisy. Replaced all of them and now it doesn't work at all anymore. Recap was good, and I have no idea why it stopped working, I get nothing on the secondary side either. Haven't had time to investigate further.

You need to check for certain but I believe the PSU outputs +/- 15V and +5V.

In my research I learned that these extron units may contain a power supply from varying suppliers. 2 same model crosspoints might have different power supply inside.
I know of one account where the guy recapped his power supply and it didnt work, after looking through pics he took prior to recapping he noticed polarity was labeled wrong on the pcb for several capacitors. After he reinstalled them with polarity matching his pictures it worked. Might be worth looking into.

Do you happen to remember the source you found that stated 15 and 5v? I cant find anything.

[deezdrama]

Im real tempted to try this....

[deezdrama]

Im making headroom guys....

At work (3rd shift) things are slow so im digging and looking at power supplies and stumbled onto the exact smps

[deezdrama]

So.... To reiterate the situation and possibly help anyone in the future.

My extron crosspoint matrix switcher is the 300 42 HVA with ADSP

The factory smps is a triple output supply made by Artesyn and is the LPT23 (5v, 12v, -12v)

Its discontinued and costs an arm and a leg if you can find one.

Digikey lists the NPT43-M as a direct replacement but instead of 12v it outputs 15v



Not sure if 15v will damage other components over time. Im sure the output voltage can be adjusted but I think it would affect the 5v line as well. Its about $55 shipped

Ive found the original power supply pinouts...


So technically I could probably save $25 and use this meanwell 5v,12v,-12v smps but not sure if it will fit in the crosspoint housing

[deezdrama]

Ok... Basically just updating this for myself and anyone in the same boat in the future.

Theres several triple output (5v,12v,-12v) power supplies with same footprint and mount hole locations, same input and output pin headers..... But none of them seem to have the same output pin order. Even the npt43m which digikey lists as a direct replacement to the factory LPT23.

Heres the pinout for those 2 and a meanwell rpt-65f



Starting to get pissed lol

Looks like nothing is a drop in replacement if this diagram for the lpt23 is correct



I could just swap pins i guess but not 100% sure that pinout for the lpt23 is correct and of course the extron board/header port isnt labeled

[deezdrama]

Ok to wrap this up for now....

The Meanwell rpt65f has the exact mounting hole spacing and the correct voltages but the pinout is different and the 5v output isnt rated as high as the original lpt23. Also this ps has higher ripple current.

I spent an hour or more looking through mousers inventory and got lucky!

Almost plug and play drop in replacement.... Its the Cincon CFM40T-02


Correct output voltages, rated the same or higher output currents as original, same ripple current, AND..... Same exact output pinout! $35

The only negative is that it has a smaller footprint so will have to figure out a way to mount it inside the crosspoint.


Hopefully this works

[Dochartaigh]

Correct output voltages, rated the same or higher output currents as original, same ripple current, AND..... Same exact output pinout! $35

I'll anxiously await to see if this works!

I've owned literally probably 10 Crosspoints... and have TWO which are bad... so I'll recap first, then if that doesn't work, and the replacement above works for you, I'll try that as well!

So just to confirm yours wouldn't power on, no lights, no nothing?

I use the larger ones, with both a primary, and a redundant/backup power supply. Mine is ALWAYS (well, 2x times at least) a problem with the redundant. On one 32x32 Crosspoint the Redundant LED is RED and the unit CONSTANTLY clicks... like the redundant is somehow messing up the primary and it's trying to switch over to the other backup power supply for some reason. My newest 32x16 the redundant LED is also red (instead of green), but no clicking... so hopefully just caps will fix that.

[deezdrama]

Correct output voltages, rated the same or higher output currents as original, same ripple current, AND..... Same exact output pinout! $35

I'll anxiously await to see if this works!

I've owned literally probably 10 Crosspoints... and have TWO which are bad... so I'll recap first, then if that doesn't work, and the replacement above works for you, I'll try that as well!

So just to confirm yours wouldn't power on, no lights, no nothing?

I use the larger ones, with both a primary, and a redundant/backup power supply. Mine is ALWAYS (well, 2x times at least) a problem with the redundant. On one 32x32 Crosspoint the Redundant LED is RED and the unit CONSTANTLY clicks... like the redundant is somehow messing up the primary and it's trying to switch over to the other backup power supply for some reason. My newest 32x16 the redundant LED is also red (instead of green), but no clicking... so hopefully just caps will fix that.

In my endless hours of reading about these extron crosspoints i remember reading about a dual psu setup in these. Was probably one of your old posts lol.
Do those have a part number on them?

[Dochartaigh]

Do those have a part number on them?

The one bad picture I took isn't clear enough to show it... but when/if I open it up to recap (which is way, way, down on my to-do list) I'll surely take pics and document.

[deezdrama]

Do those have a part number on them?

The one bad picture I took isn't clear enough to show it... but when/if I open it up to recap (which is way, way, down on my to-do list) I'll surely take pics and document.

I completely understand. I bought this crosspoint in 2023 i think and just now got around to opening the box and messing with it lol.

[deezdrama]

The Cincon ps came today. Input and output connections are identical. Boy is this thing small, ill have to use the plastic adhesive backed standoffs or build somekind of adapter to mount it inside the crosspoint.

I was so excited to find a suitable replacement with same triple output voltages and pinout that i overlooked the originals -12v output is rated for 500mA while this ones -12v is rated for 300mA. I assume the negative voltage is needed for the negative peaks of analog signals. These ratings are for passively cooled setups (heatsinks) which is how they are from the factory. The new units -12v is rated for 500mA if fan cooled. Maybe ill add a fan but im sure it will be fine. Im going to add a power switch to the iec c13 power cable so it can be turned off and dont plan to run it more than a couple hours here and there.

Had to go to work but will verify voltages/pinout and test when I get home

[deezdrama]

Bingo!

[Dochartaigh]

Glad you got it working! Might hit you up when I eventually open mine and can see the specs/model# of the power boards inside.

[deezdrama]

Glad you got it working! Might hit you up when I eventually open mine and can see the specs/model# of the power boards inside.

Sure... Would be happy to help

[deezdrama]

Adhesive backed nylon standoffs arrived and got it all buttoned up just in time for the 3DO MK2 beta iso drop