LightmaXX LED PAR64 wont power on

[Fr3shGy]

Hi guys,

So i got a LED PAR64 floodlight. It wont turn on.

The status check LED on the powerboard is flickering and there is a noise like a constant clicking noise so basicly ....click click click click and keeps on going.

The sound seems to be near the transformator.

The caps seems to be fine on the first view. But could a cap produce this kind of a clicking noise?

What part in a power supply can make these sounds?

Best regards

[stj]

Re: LightmaXX LED PAR64 wont power on

ticking usually means something is shorted - check all the diodes.

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

ticking usually means something is shorted - check all the diodes.

Done. Check all silicon and germanium diodes. All got 0.583V and 0l in reverse.

Checked the capaciators all fine.

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

The output voltages are not as usual. Ive got 22 V on the DC output cabels (2 red cabels).
Thats fine so the second board underneath the powesupply should start working but it dont.

The voltage connected to the second board drops down to 2~3 Volts on the connector. I dont get why as soon as i connect the 2 red cabels with the second board it drops down?

[budm]

Re: LightmaXX LED PAR64 wont power on

Is the connector of the two red wires labeled as + and - (I see one pin is labeled with 'DC')? If they are, then check the resistance between the two wires to see if it shows low resistance (<10 Ohms or so) reading. Can we see straight shot pictures of the both board, top side and the also the bottom side of the boards?
BTW, to have two red wires for DC, it does not look right, it should have return wire some where, the pictures do not show the connections between the two boards in details that I can see.

https://www.badcaps.net/forum/attach...2&d=1479175395
Looking at this picture, it looks like both red wires are V+.

The power supply will go into shutdown-restart mode, thus you hear the ticking sound, because the load is drawing too much current than the power supply can handle.

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

I checked the resitance between the 2 DC cabels its around 0.6 kohms.

I got some pictures of the 2 boards bottom and top and the connection between the 2 with cables attached.

I got something. If i disconnect the psboard from the logicboard where the fans are connectet on ....the clicking noise goes down to 0 and the status led on the psboard stays steady.

The DC cables DC + and DC - got me around 22~24 V if i connect them back to the logic board it drops down to 3 V and the flickering starts again.

So i guess the issue must be on the logic board? or is the psboard not stable enough to produce the full 24V?

budm: quiet hard to see but the right red cable is V+ = DC+ and the red cable next to the ground is V- = DC-

[budm]

Re: LightmaXX LED PAR64 wont power on

Boy , that is bad when they use two red wires one for DC+ and and one for DC - instead of RED for the DC+ and Black for the DC-.
The possibility of the power supply ticking can be due to bad caps in the power supply board such as the small startup caps in the primary side, I see two of them one is C17 another one I cannot see the designator, or the filter caps in the cold side, or the load is drawing too much current.
I also expect the resistance between the DC+ and the DC- to in the thousands of Ohms not 600 Ohms.
You can use two SMALL Wattage 12V 10 Watts lamps connected in series and hook up to the DC+ DC- to see if the power supply will still putting out steady 24VDC.
BTW, where is the lamp connection?
I also see the Electret microphone MIC) on the driver board. What is that for?
Can we get the full make and model of this device so we can look up the user manual and know what it is?

What are the P/N of those 4 devices mounted on the heatsinks on the driver board?

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

I changed the 2 cabels now. DC+ is brown and DC- is black now.

I renewed all caps and also the big 200V caps with new ones still same ticking.

I connected the logicboard with a 24V DC ps from my printer and it is working the fans start runing and the light comes up.

I added the two lamps and a little fan to the DC+ and DC- outlets and it immediately goes down to around 3 V.

The lamp connection is on the logic board its that 3 pin connector. This Lightmax has the function to recognize the beat if u play music and it produces some strobes with the rhythm of the music.

There is acutaly a board name. I was able to find it on this site https://gzkaihui.en.alibaba.com/prod..._CCTV_PSU.html

KH-100-24
INPUT: 90-132V AC 1.9A
176-264V AC 0.8A 50/60Hz
Output: +24V 4.5A
Manufacture: Kaihui

The 4 devices are mosfets from Infineon with the P/N IRFZ44N.

I am runing out of stuff i can renew on the board i even renewed the little transformator.... still the same issue.

But i finaly can say that the logic board cant be the source of the issue. It must be the powersupply somehow.

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

I found out that if i just touch a bin on the DC side of the board it fires up.

and the ticking noise turns off, fans runing everythink is fine. But it wont come on by itself without me tickling i pin of a resistor or a mosfet on the dc side?

What does that mean is there to much resistance in the circruit?

[budm]

Re: LightmaXX LED PAR64 wont power on

I found out that if i just touch a bin on the DC side of the board it fires up.

and the ticking noise turns off, fans runing everythink is fine. But it wont come on by itself without me tickling i pin of a resistor or a mosfet on the dc side?

What does that mean is there to much resistance in the circruit?

What is the 'BIN'?

[stj]

Re: LightmaXX LED PAR64 wont power on

probably PIN

[Fr3shGy]

Re: LightmaXX LED PAR64 wont power on

Sorry i mean pins.

So basicly if i touch one of these pins with my multimeter the ticking slows down and the DC voltage goes from ~5V up to 24V.

this happens with following parts:

R15, R16, D4, U2, R13, R17, D2, U1, D (The Mosfet), C12, C13, C14, C15, C16

And it starts if i heat up that section of the PS.

What does that mean?

I checked the resistance of the DC Lines it goes from 400 ohms up to 600 ohms then my multimeter shows overload?