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]> 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]> *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]> *On Behalf Of *The > MacDougals via TriEmbed > *Sent:* Friday, November 26, 2021 9:11 PM > *To:* [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 marked B1238, so I assume it is a 2SB1238, which is obsolete.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 > > > _______________________________________________ > Triangle, NC Embedded Interest Group mailing list > > To post message: [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]?subject=unsubscribe > Searchable email archive available at > https://www.mail-archive.com/[email protected]/ > > -- [image: photo] *Shane D Trent* Patent Agent 919-348-0061| [email protected] ShaneTrent.com Raleigh, North Carolina <http://www.linkedin.com/in/shanetrent> <https://twitter.com/sdtrent> Create your own email signature <https://www.wisestamp.com/create-own-signature/?utm_source=promotion&utm_medium=signature&utm_campaign=create_your_own&srcid=>
_______________________________________________ Triangle, NC Embedded Interest Group mailing list To post message: [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]?subject=unsubscribe Searchable email archive available at https://www.mail-archive.com/[email protected]/
