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--- s32d850t_monitor_repair [2021/02/15 09:22]
sausage
+++ s32d850t_monitor_repair [2024/03/20 21:18] (current)
sausage Resistor value added
@@ Line 57: / Line 57: @@
 The other thing I could not find was a standard chart or guide to Gas Surge Tube colour bands. I tried a few datasheets of particular brands of tube. It appeared that colour bands mean something per manufacturer, but I am still to confirm this.
-At any rate, it was time to move on.
+<WRAP center round tip 90%>
+Since then P.Remaker has been in touch and got some great answers on these "Sparkgap Arrestors", [[https://electronics.stackexchange.com/questions/689916/what-is-this-part-from-an-lcd-monitor-power-supply|what is it, and it's designator]] and [[https://electronics.stackexchange.com/questions/111550/what-is-this-component-and-what-is-its-use|it's symbol]]. You can get more in-depth reading [[https://www.lsp-international.com/lightning-current-surge-and-overvoltage-protection | here]]. With all that said, this part is doing more to save your monitor than being the cause of your fault.
+</WRAP>
 Everything on the pre-rectified AC side appeared to be OK, so was time to move to the rectifed side and see if the issue was there instead.
@@ Line 65: / Line 68: @@
 {{ :s32d850t:resistor-on-board.jpg?direct |}}
-It was clearer once out of the board. Suffice to say the resistor was dead, no continuity at all.
+It was clearer once out of the board. Suffice to say the resistor was dead, no continuity at all. The band colours are Brown, Black, Silver. Then tolerance band is Gold, making this 0.1 Ohm.
 {{ :s32d850t:resistor-damaged.jpg?direct |}}
@@ Line 124: / Line 127: @@
 {{ :s32d850t:mosfet-bad-good.jpg?direct |}}
-Five new MOSFETs arrived in the post. No shorts. All tested beautifully.
+Five new MOSFETs arrived in the post. No shorts. All tested beautifully. I purchased these from [[https://www.aliexpress.com/item/1005001872528899.html?spm=a2g0o.order_list.order_list_main.5.23da18023WmIM6 | Aliexpress here]]. Parts are hard enough to get anywhere, and these worked well enough for me. Be sure to select ''KF12N60 TO-220F'' so that you order the right MOSFET.
 Interesting to note, all the new ones had a different forward voltage from 0.5, to 0.8. I used the 0.7 one.
@@ Line 130: / Line 133: @@
 Quick check on the board, seems no more shorts. Time to power the board up.
-Turned on: no bang. Isolation transfomer didn't blow a fuse. That's something!
+<WRAP center round tip 80%>
+Received a note from Dave P who performed the same repair but used a FDPF15N65 (15 A, 650 V, N-Channel MOSFET by ONSEMI in a TO-220F package), and is working well.
+</WRAP>
+Turned on: no bang. Isolation transformer didn't blow a fuse. That's something!
 Tested the cold side output pins. I got the expected 4 x 12.8V pins, 1 x 2 volt and 1 x 3 volt output pins. I think this is a winner!
@@ Line 148: / Line 156: @@
 {{ :s32d850t:monitor.jpg?direct |}}
+===== Other Successes =====
+Nathan B, Nicolas S, Dave P, Jan.B from Germany, and Frank from Germany have been in touch to let me know that they have all managed to get their S32D850T's going again.
+I also received a really nice note from Karen and Danny Ellis of [[https://www.facebook.com/r2rAussie | Mend It, Australia]] who used the article to help inspire their repair. Theirs was set as a repair subject for the up and coming [[https://openrepair.org/repair-day/ | International Repair Day 2021]].
+You can see the video showing the analysis of their repair on [[https://www.facebook.com/r2rAussie/videos/2643234922652149/ | Facebook]], [[https://twitter.com/MendItAussie/status/1444178866575077381 | Twitter]] or [[https://www.instagram.com/p/CUgziAJpyYu/ | Instagram]].
+Mend It, Australia was recently a featured speaker at the [[https://www.youtube.com/watch?v=k4zrmTsZj_s | Australian Repair Summit]] in Canberra during 2021.
+I always love to hear if this repair helps you. Please always get in touch if you managed to get your monitor going or need some advice.

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