The display blinked back on at full intensity for a short while yesterday! I believe it is the back light of the LCD that is the issue.
---> Paul From: TriEmbed <[email protected]> On Behalf Of The MacDougals via TriEmbed Sent: Saturday, December 18, 2021 3:02 PM To: [email protected] Subject: Re: [TriEmbed] Substitute transistor I replaced the transistor with an exact match from ebay and a couple of electrolytic caps (at Carl’s suggestion). The display is still dim. Oh well. ---> Paul From: TriEmbed <[email protected] <mailto:[email protected]> > On Behalf Of The MacDougals via TriEmbed Sent: Friday, November 26, 2021 9:11 PM To: [email protected] <mailto:[email protected]> Subject: [TriEmbed] Substitute transistor My microwave display suddenly went very dim. I opened it up and found a discolored spot on a circuit board feeding the display (see attached image). That component is marked B1238, so I assume it is a 2SB1238, which is obsolete. https://www.digikey.com/en/products/base-product/rohm-semiconductor/846/2SB1238/30307 Medium power transistor( 80V, 0.7A) 2SB1189 / 2SB1238 Features 1) High breakdown voltage, BVCEO= 80V, and high current, IC= 0.7A. 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. Anyone want to help me find a replacement? I dug through my Dad’s stash of old electronics and found a TIP30B, which looks like it might work. ---> Paul
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