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Nintendo GBA
Game Boy Micro Not charging, I think it's the Diode, looking for help
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<blockquote data-quote="Ozito" data-source="post: 10315834" data-attributes="member: 37684"><p>You found my pics <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite48" alt=":)" title="smile :)" loading="lazy" data-shortname=":)" /></p><p>Well done with the troubleshooting and detailed post<img class="smilie smilie--emoji" loading="lazy" alt="👌" title="OK hand :ok_hand:" src="https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/72x72/1f44c.png" data-shortname=":ok_hand:" /></p><p></p><p>TLDR; Try the SSM5818SLGP it might solve your problem.</p><p></p><p>You're correct, It seems like the diode is dead with those results you get on the multimeter.</p><p>The "S3" code can be looked up if you search for "smd marking codes", you'll probably see <a href="https://smd.yooneed.one/" target="_blank">this fantastic piece of resource</a> in your results. "Ctrl f" your way to "S3" and in there you'll see a list of diodes.</p><p></p><p>Let's get some things clear first, before we start looking for a replacement.</p><p>We know from the first pic, that the B+ (yellow) circuit has about 4.x Volts when being charged and probably drops to 3.x Volts when powered by the battery. We can also find out from the specs printed on the charger that, the output is rated to 5.2 Volts and 320 milliamps.</p><p>Armed with these numbers we are now going to do some guessing.</p><p></p><p>My first guess is that the voltage on the B+ circuit doesn't go higher nor barely reaches 5.2V when battery is being charged.</p><p>My second guess is that the charge circuit dosen't go higher than 320mA and thus the diode doesn't see more action than that.</p><p>My third guess is that any diode that blocks voltages from 3V and up, and also has an "average forward current" of at least 320mA, should be fine for this circuit.</p><p></p><p>So now with that in mind, let's find a replacement diode.</p><p>The diode that should fit that circuit is the "SSM5818SLGP", why? Because next to it you can read "SBR, 30V, 500mA, Vf<0.43V(500mA)" That means it blocks 30V and safely conducts 500mA.</p><p>Do you want more specs? <a href="https://download.datasheets.com/pdfs2/2019/6/22/9/24/4/647353/chec_/auto/1338370959oj3ua.pdf" target="_blank">Have a look at the datasheet.</a></p><p></p><p>I'm a big dork for these GBMs, I too have the 20th happy mario edition, bought it new in 2011 for approx 100USD.</p><p>Now let's try and keep them away from the trash and fix all of them.</p></blockquote><p></p>
[QUOTE="Ozito, post: 10315834, member: 37684"] You found my pics :) Well done with the troubleshooting and detailed post👌 TLDR; Try the SSM5818SLGP it might solve your problem. You're correct, It seems like the diode is dead with those results you get on the multimeter. The "S3" code can be looked up if you search for "smd marking codes", you'll probably see [URL='https://smd.yooneed.one/']this fantastic piece of resource[/URL] in your results. "Ctrl f" your way to "S3" and in there you'll see a list of diodes. Let's get some things clear first, before we start looking for a replacement. We know from the first pic, that the B+ (yellow) circuit has about 4.x Volts when being charged and probably drops to 3.x Volts when powered by the battery. We can also find out from the specs printed on the charger that, the output is rated to 5.2 Volts and 320 milliamps. Armed with these numbers we are now going to do some guessing. My first guess is that the voltage on the B+ circuit doesn't go higher nor barely reaches 5.2V when battery is being charged. My second guess is that the charge circuit dosen't go higher than 320mA and thus the diode doesn't see more action than that. My third guess is that any diode that blocks voltages from 3V and up, and also has an "average forward current" of at least 320mA, should be fine for this circuit. So now with that in mind, let's find a replacement diode. The diode that should fit that circuit is the "SSM5818SLGP", why? Because next to it you can read "SBR, 30V, 500mA, Vf<0.43V(500mA)" That means it blocks 30V and safely conducts 500mA. Do you want more specs? [URL='https://download.datasheets.com/pdfs2/2019/6/22/9/24/4/647353/chec_/auto/1338370959oj3ua.pdf']Have a look at the datasheet.[/URL] I'm a big dork for these GBMs, I too have the 20th happy mario edition, bought it new in 2011 for approx 100USD. Now let's try and keep them away from the trash and fix all of them. [/QUOTE]
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