<div dir="ltr">Do you think the backlight going out would shut down the system? Do you know what voltage rail is used for the backlight?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jan 15, 2022 at 1:26 PM The MacDougals via TriEmbed <<a href="mailto:triembed@triembed.org">triembed@triembed.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="gmail-m_-6594334314658531361WordSection1"><p class="MsoNormal">The display blinked back on at full intensity for a short while yesterday!<u></u><u></u></p><p class="MsoNormal">I believe it is the back light of the LCD that is the issue.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">---> Paul<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> TriEmbed <<a href="mailto:triembed-bounces@triembed.org" target="_blank">triembed-bounces@triembed.org</a>> <b>On Behalf Of </b>The MacDougals via TriEmbed<br><b>Sent:</b> Saturday, December 18, 2021 3:02 PM<br><b>To:</b> <a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a><br><b>Subject:</b> Re: [TriEmbed] Substitute transistor<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I replaced the transistor with an exact match from ebay and a couple of electrolytic caps (at Carl’s suggestion).<u></u><u></u></p><p class="MsoNormal">The display is still dim. Oh well.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">---> Paul<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> TriEmbed <<a href="mailto:triembed-bounces@triembed.org" target="_blank">triembed-bounces@triembed.org</a>> <b>On Behalf Of </b>The MacDougals via TriEmbed<br><b>Sent:</b> Friday, November 26, 2021 9:11 PM<br><b>To:</b> <a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a><br><b>Subject:</b> [TriEmbed] Substitute transistor<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="font-size:14pt">My microwave display suddenly went very dim. I opened it up and found a discolored<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">spot on a circuit board feeding the display (see attached image). That component is<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">marked B1238, so I assume it is a 2SB1238, which is obsolete.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><a href="https://www.digikey.com/en/products/base-product/rohm-semiconductor/846/2SB1238/30307" target="_blank">https://www.digikey.com/en/products/base-product/rohm-semiconductor/846/2SB1238/30307</a><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">Medium power transistor( 80V, 0.7A) 2SB1189 / 2SB1238 Features 1) High breakdown voltage, BVCEO= 80V, and high current, IC= 0.7A.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">2) Complements the 2SD1767 / 2SD1859. Absolute maximum ratings (Ta=25C) Parameter Symbol Limits Collector-base voltage VCBO −80 Collector-emitter voltage VCEO −80 Emitter-base voltage VEB O −5 Collector current IC −0.7 C.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">Anyone want to help me find a replacement?<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">I dug through my Dad’s stash of old electronics and found a TIP30B, which looks like it might work.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14pt">---> Paul<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14pt"><u></u> <u></u></span></p></div></div>_______________________________________________<br>
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