Trying to identify a smd. Markings GD 1B

• Trying to identify a smd. Markings GD 1B
  Posted by magnetchief on 04 Mar, 2022 19:57
• hi,
  I am attempting to repair a small temperature control device.
  I noticed that a small smd on the circuit board had blown.
  Attached is a photo of the device, There are very few markings and have so far drawn a blank searching online.
  Much appreciated,

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• #1 Reply
  Posted by Jbouss on 05 Mar, 2022 01:13
• It may be possible to figure out what the IC is by what it is traced to. I suggest attaching a picture of the full board; you could go a step further and draw out what is attached to each pin.
  
  Good luck!
• #2 Reply
  Posted by amyk on 05 Mar, 2022 02:49
• Does RT8010-15GQW match? https://www.s-manuals.com/ru/smd/gd
• #3 Reply
  Posted by magnetchief on 07 Mar, 2022 15:30
• Many thanks. 
  Will try that
  
• #4 Reply
  Posted by magnetchief on 07 Mar, 2022 19:51
• Attached is the whole board.
  It is a temperature control device, 2 thermocouples, a heater and a heater  safety sensor device (a PT100 sensor to measure heater temp)
  
  The yellow wire (U1+) shows the small pad where the damaged part was removed.
  
  Unfortunately I do not have the skill required to describe its function within the circuit.
  
  Many thanks for any advice.

  ---

  
• #5 Reply
  Posted by amyk on 08 Mar, 2022 01:38
• Definitely not RT8010 or any other switching regulator.
• #6 Reply
  Posted by mvs on 11 Mar, 2022 20:42
• Quote from: magnetchief on 07 Mar, 2022 19:51

  Unfortunately I do not have the skill required to describe its function within the circuit.
  

  It is an ESD protection clamp, similar to Semtech RClamp3354S
  https://www.semtech.com/products/circuit-protection/low-capacitance/rclamp3354s
  
  The clamp near LN2 T1 and T2 pads seems to be unused. You can salvage it for a repair.
• #7 Reply
  Posted by magnetchief on 23 Mar, 2022 14:54
• Many thanks, I will give that a go.