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LED Lamp PSU board, help to identify a component
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Topic: LED Lamp PSU board, help to identify a component (Read 418 times)
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Aheld
Regular Contributor
Posts: 58
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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
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fzabkar
Super Contributor
Posts: 2806
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Re: LED Lamp PSU board, help to identify a component
«
Reply #1 on:
December 25, 2024, 05:08:19 pm »
SY5839
https://uploadcdn.oneyac.com/attachments/userfile/b3/f8/1594696923597_3851.pdf
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Aheld
Regular Contributor
Posts: 58
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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
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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 »
I guessed that it was a Silergy part.
https://www.google.com/search?q=filetype%3Apdf+%22absolute+maximum%22+ztxyz+silergy
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Aheld
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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
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fzabkar
Swake
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Re: LED Lamp PSU board, help to identify a component
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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.
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When it fits stop using the hammer
Aheld
Regular Contributor
Posts: 58
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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
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