The display is buried amongst several layers of things on the control panel.
I am hesitant to try to separate the layers. There appears to be no impact to the operation of the oven. ---> Paul From: Shane Trent <[email protected]> Sent: Saturday, January 15, 2022 5:59 PM To: Paul MacDougal <[email protected]> Cc: TriEmbed Discussion <[email protected]> Subject: Re: [TriEmbed] Substitute transistor Do you think the backlight going out would shut down the system? Do you know what voltage rail is used for the backlight? On Sat, Jan 15, 2022 at 1:26 PM The MacDougals via TriEmbed <[email protected] <mailto:[email protected]> > wrote: 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] <mailto:[email protected]> > On Behalf Of The MacDougals via TriEmbed Sent: Saturday, December 18, 2021 3:02 PM To: [email protected] <mailto:[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:triembed@triembedorg> 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 That component is marked B1238, so I assume it is a 2SB1238, which is obsolete.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 _______________________________________________ Triangle, NC Embedded Interest Group mailing list To post message: [email protected] <mailto:[email protected]> List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org TriEmbed web site: https://TriEmbed.org To unsubscribe, click link and send a blank message: mailto:[email protected] <mailto:[email protected]> ?subject=unsubscribe Searchable email archive available at https://wwwmail-archive.com/[email protected]/ <https://www.mail-archive.com/[email protected]/> -- Shane D Trent Patent Agent <tel:919-348-0061> 919-348-0061| <mailto:[email protected]> [email protected] <http://ShaneTrent.com> ShaneTrent.com Raleigh, North Carolina <http://www.linkedin.com/in/shanetrent> <https://twitter.com/sdtrent> <https://www.wisestamp.com/create-own-signature/?utm_source=promotion&utm_medium=signature&utm_campaign=create_your_own&srcid=> Create your own email signature
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