Just a slight bit of track damage...!!!

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1024MAK
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Just a slight bit of track damage...!!!

Post by 1024MAK » Sat Jan 14, 2017 11:12 pm

Just a slight bit of track damage to this PCB...

These are pictures of the damaged board after stages one and two of cleaning it.
Image
Image
Image
Image

It's nothing to do with retro computing.
:arrow: So who would like a guess at (1) what it is, and (2) what caused the damage? :?:

Mark

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paulv
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Re: Just a slight bit of track damage...!!!

Post by paulv » Sat Jan 14, 2017 11:22 pm

LED display board matrix????

As for the damage, no idea. Water ingress?

EDIT: or was it hooked up to the mains accidentally?

Paul

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MartinB
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Re: Just a slight bit of track damage...!!!

Post by MartinB » Sat Jan 14, 2017 11:29 pm

Is it the Avalanche Charge Pump from a Photon Torpedo Cannon? Damage by a hyper-energy burst blast from a Klingon Ion Laser?

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Re: Just a slight bit of track damage...!!!

Post by CMcDougall » Sat Jan 14, 2017 11:30 pm

a CPU for a Spectrum 16k & mod for 48k :lol:

skip comes to mind.....
ImageImageImage

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Re: Just a slight bit of track damage...!!!

Post by hoglet » Sun Jan 15, 2017 8:17 am


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Re: Just a slight bit of track damage...!!!

Post by richardtoohey » Sun Jan 15, 2017 8:18 am

No ideas for (1) and (2) but interested (as a complete electronics know-nothing-but-wants-to-learn-more) to see how you fix it. :-k :?: :-D

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Re: Just a slight bit of track damage...!!!

Post by poink » Sun Jan 15, 2017 8:48 am

paulv wrote:EDIT: or was it hooked up to the mains accidentally?
Judging by the wire colours, I think it is for the mains.

I'd guess some sort of LED lighting panel. It looks like the mains is being rectified (but not smoothed) and then applied across a chain of LEDs. The disc component is probably MOV for surge protection. (Seems reasonable as that's what Marl International do). Also, 22 white LEDs at a 3V drop each, which means on a UK supply that 1.8K resistor has about 180V across it and a current of about 100mA, which is also plausible.

As to what killed it, I notice there's some burning around one of the resistors, so, at a guess, some components failed short, which increased the load on the others, causing them to fail like dominos. The damage to tracks it's guess is essentially overheating, although the initial trigger could have been liquid getting in.

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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 2:08 pm

Some very good deductions there :D
But also some guesses that are nearly in the right area.

It is not a display board as such. It does use LEDs.
Water ingress is part of the problem.
It is designed to be connected to a mains supply, but not 230/240V AC.
It was not part of a Photon Torpedo Cannon, and was not damaged by any Klingon weapon.
As stated in the post, it's not anything to do with retro computing.
It was made by MARL. But is not office lighting.
It is LEDs used for lighting.
Poink is very close. But the primary cause of the damage is not thought to have been caused by components failing short circuit.

More later...

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Re: Just a slight bit of track damage...!!!

Post by duikkie » Sun Jan 15, 2017 2:49 pm

CuO :) or CU2O

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Re: Just a slight bit of track damage...!!!

Post by george.h » Sun Jan 15, 2017 3:49 pm

Battery leakage from an emergency (maintained?) lighting battery pack? Or (not so) sealed lead-acid battery? :wink:
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 4:23 pm

The was no battery or cell in the unit.

Mark

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Re: Just a slight bit of track damage...!!!

Post by BigEd » Sun Jan 15, 2017 5:30 pm

An aquarium light?

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Re: Just a slight bit of track damage...!!!

Post by duikkie » Sun Jan 15, 2017 5:59 pm

exit board ?
df04s max=400volt

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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 6:37 pm

No, not an aquarium light!

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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 6:40 pm

duikkie wrote:exit board ?
df04s max=400volt
The supply voltage was well within the specifications of the bridge rectifier.
Not a fire exit light.

Mark

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Re: Just a slight bit of track damage...!!!

Post by BigEd » Sun Jan 15, 2017 6:48 pm

Got it - reactor malfunction warning light from a nuclear sub. A leaky sub.

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Re: Just a slight bit of track damage...!!!

Post by george.h » Sun Jan 15, 2017 6:59 pm

I know! It was wee'd on! :shock: :lol:

My dad used to come across that with VCRs he was called out to repair :-& :shock:

Usual suspect was the dog, but sometimes he suspected the dog was merely the owner's scapegoat....
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1024MAK
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 7:15 pm

BigEd wrote:Got it - reactor malfunction warning light from a nuclear sub. A leaky sub.
Not from a sub. But the area used was a bit wet...

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Re: Just a slight bit of track damage...!!!

Post by JonC » Sun Jan 15, 2017 7:15 pm

Some major guesswork but;

Some sort of LED matrix driver, possibly for signage (e.g. traffic lights or overhead gantries)? #-o

Killed by excess bird poop causing acide damage!? :lol:
Jon
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1024MAK
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 7:21 pm

george.h wrote:I know! It was wee'd on! :shock: :lol:

My dad used to come across that with VCRs he was called out to repair :-& :shock:

Usual suspect was the dog, but sometimes he suspected the dog was merely the owner's scapegoat....
I'd be we'll impressed if someone could demonstrate how they wee'd on it. It was mounted in it's supposed IP67 case... on a wall...

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1024MAK
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 7:25 pm

JonC wrote:Some major guesswork but;

Some sort of LED matrix driver, possibly for signage (e.g. traffic lights or overhead gantries)? #-o

Killed by excess bird poop causing acide damage!? :lol:
No, nothing to do with matrix signs, traffic lights or overhead gantries.
Not many birds in the area where it was used. As in normally none at all.

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Re: Just a slight bit of track damage...!!!

Post by BigEd » Sun Jan 15, 2017 7:52 pm

Why would the tracks keep getting fat between the LEDs? Heat spreading? Opacity?

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Re: Just a slight bit of track damage...!!!

Post by duikkie » Sun Jan 15, 2017 8:01 pm

if it is not 230 volt , it must be power volt 380 volt or far,far,far below 230 volt

looks like

xxxxxxxxxx
.xxxxxxxx.
.xxxxxxxx.
.xxxxxxxx.
xxxxxxxxxx

diffenent led color can make a picture , arrow or other symbol
1024MAK wrote:
duikkie wrote:exit board ?
df04s max=400volt
The supply voltage was well within the specifications of the bridge rectifier.
Not a fire exit light.

Mark

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Re: Just a slight bit of track damage...!!!

Post by paulv » Sun Jan 15, 2017 8:02 pm

So, given what we've established up to now, is it the PCB out of one of these or an older variant?.

https://www.leds.co.uk/application/file ... series.pdf

If so, what colour are the LED's? It may provide a clue as to the usage.

Paul

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Re: Just a slight bit of track damage...!!!

Post by BigEd » Sun Jan 15, 2017 8:07 pm

Can it light either the left or right set depending on polarity of supply?

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Re: Just a slight bit of track damage...!!!

Post by george.h » Sun Jan 15, 2017 8:12 pm

Hmmm.....

Tunnel?
Marine (ship/rig)?
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1024MAK
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 8:20 pm

paulv wrote:So, given what we've established up to now, is it the PCB out of one of these or an older variant?.

https://www.leds.co.uk/application/file ... series.pdf

If so, what colour are the LED's? It may provide a clue as to the usage.

Paul
Yep, it's from a MARL LED bulkhead lamp.

Well done Paul =D> =D> =D>

The LEDs are blue. It is at least 16 years old, so uses through-hole 5mm LEDS.

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1024MAK
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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 8:21 pm

BigEd wrote:Can it light either the left or right set depending on polarity of supply?
No, all LEDs light at once.

Mark

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Re: Just a slight bit of track damage...!!!

Post by 1024MAK » Sun Jan 15, 2017 8:21 pm

george.h wrote:Hmmm.....

Tunnel?
Marine (ship/rig)?
Yes, tunnel...

Mark

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Re: Just a slight bit of track damage...!!!

Post by george.h » Sun Jan 15, 2017 8:31 pm

1024MAK wrote:
george.h wrote:Hmmm.....

Tunnel?
Marine (ship/rig)?
Yes, tunnel...

Mark
Ah... Could be marking an emergency exit if a road tunnel.
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