Electronics > Repair

LED Lamp PSU board, help to identify a component

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Aheld:
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

fzabkar:
SY5839

https://uploadcdn.oneyac.com/attachments/userfile/b3/f8/1594696923597_3851.pdf

Aheld:
Hi Fzabkar,

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

Br.
Axel

fzabkar:
I guessed that it was a Silergy part.

https://www.google.com/search?q=filetype%3Apdf+%22absolute+maximum%22+ztxyz+silergy

Aheld:
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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