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I think it is a Zener diode but there is no marking except a '5' and five parallel lines (polarity?).

The component is on a Dumbo2 Rev2.1 motherboard for the Ideapad Z710.

enter image description here

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    \$\begingroup\$ Welcome to EE.SE. The easy way is to power up the board and measure the voltage across this diode. \$\endgroup\$ – VTNCaGNtdDVNalUy Mar 26 '18 at 2:00
  • \$\begingroup\$ Thank you for you suggestion. Unfortunately the component is on the "wrong" side of the motherboard. I can't access it to measure the voltage. \$\endgroup\$ – Amii274 Mar 26 '18 at 4:45
  • \$\begingroup\$ What the 5 number stand for? on the smd code i found -5 =5 and >5 but no 5 lines over the number 5 \$\endgroup\$ – Amii274 Mar 26 '18 at 4:47
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    \$\begingroup\$ I do not understand. You were able to get a clear close up view, but you cannot get probes to it? The number 5 by itself means nothing. These parts are too tiny to silkscreen a full part number or part code on them. \$\endgroup\$ – VTNCaGNtdDVNalUy Mar 26 '18 at 4:59
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    \$\begingroup\$ Solder on a pair of fine gauge insulated wires to the diode, 22 to 26 awg will do, and run them outside the case so you can mostly close it up. There is always a trick to diagnose a problem. \$\endgroup\$ – VTNCaGNtdDVNalUy Mar 26 '18 at 5:16
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Probably RB751V-40 Schottky diode, datasheet: http://www.rohm.com/web/in/datasheet/RB751V-40

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  • \$\begingroup\$ That is great - Thank you very much to all of you - this just shows the power of the community. \$\endgroup\$ – Amii274 Mar 26 '18 at 16:24

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