Author Topic: LED Lamp PSU board, help to identify a component  (Read 418 times)

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Offline AheldTopic starter

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LED Lamp PSU board, help to identify a component
« on: December 25, 2024, 04:04:48 pm »
Hi Forum,

I have a PCB of a PSU for a LED lamp with approx 150cm lenght.
I seems to be a series issue that some of the lamps start to switch on and off with a frequency of approx. 5Hz with reduced brightness of the Lamp.
I started to redraw the schematic and found one component I can't identify (I would guess the PWM controller). Marking:  ZTCIA (SOT23-6?)
After touching one of the feedback components to the ZTCIA IC with the oscilloscope probe, flashing frequency slows down and brightness increases.

Can anybody help me to find the datasheet of this device?
Does someone knows this issue with this kind of PSU?

Thanks
Axel
 

Offline fzabkar

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Offline AheldTopic starter

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Re: LED Lamp PSU board, help to identify a component
« Reply #2 on: December 25, 2024, 06:46:10 pm »
Hi Fzabkar,

thank you so much. Do you already know this device or where did you find this information?

Br.
Axel
 

Offline fzabkar

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Re: LED Lamp PSU board, help to identify a component
« Reply #3 on: December 25, 2024, 07:56:57 pm »
 

Offline AheldTopic starter

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Re: LED Lamp PSU board, help to identify a component
« Reply #4 on: January 03, 2025, 03:45:14 pm »
Hi all,
may be is helps another person.

The lamp is working like new. It was a defect Zener Diode (18V, 500mW).
I attached the schematic (without warranty) from this lamp.
The lamp was a RIDI, PFYB 1500/60000-840 DV3

Br.
Axel
 
The following users thanked this post: fzabkar

Offline Swake

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Re: LED Lamp PSU board, help to identify a component
« Reply #5 on: January 04, 2025, 10:06:13 am »
Thanks for the feed back and the schematic. It looks like it is a good design.
Always interesting to see something is repaired. Better than recycling and much much better than landfill material.
When it fits stop using the hammer
 

Offline AheldTopic starter

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Re: LED Lamp PSU board, help to identify a component
« Reply #6 on: January 04, 2025, 01:26:41 pm »
Yea, I fully aggree.
And it was a nice starting point for SPSU investigations.

Mean while, I recieved another lamp with same failure behaviour and same defect zener diode. Easy going  :box:
 


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