Sony SDM-HS73 on for 2 seconds then off
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Re: Sony SDM-HS73 on for 2 seconds then off
Using the schematic in this thread I tested the 4 mosfets as suggested. All 4 check out okay. None of them indicate a short, and all 4 have very similar readings. I'm in the process of more thoroughly testing the inverters, I'll report back with those number soon.
I just acquired a broken Viewsonic Q191wb (19" widescreen) off craigslist. Can I use this monitor to test the CCFLs in the Sony and vise versa? I'm not sure since the Sony is a 17" and the Viewsonic is a 19". Also, I'm not sure if the different makes would cause a problem.
So in addition to my posts on the Sony SDM-HS73, I'll be posting soon in the existing thread for Q191wb.Comment
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Re: Sony SDM-HS73 on for 2 seconds then off
Using the schematic in this thread I tested the 4 mosfets as suggested. All 4 check out okay. None of them indicate a short, and all 4 have very similar readings. I'm in the process of more thoroughly testing the inverters, I'll report back with those number soon.
I just acquired a broken Viewsonic Q191wb (19" widescreen) off craigslist. Can I use this monitor to test the CCFLs in the Sony and vise versa? I'm not sure since the Sony is a 17" and the Viewsonic is a 19". Also, I'm not sure if the different makes would cause a problem.
So in addition to my posts on the Sony SDM-HS73, I'll be posting soon in the existing thread for Q191wb.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: Sony SDM-HS73 on for 2 seconds then off
I replaced the 4 27K3KV ceramic disc capacitors but that didn't fix the problem. I am beginning to suspect one of the inverters is bad. Between several of the pins the resistance starts at 6+ mohm and then after about 1 second it drops to several hundred kohms. This only happens on one transformer, but consistently happens between a certain group of pins. So I'm thinking either the transformer is bad, but I guess it's possible a short in the board is causing this as well. My plan is to try and desolder the transformers and test them out of circuit. Should be interesting, I've never tried to desolder something with so many pins.Comment
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Re: Sony SDM-HS73 on for 2 seconds then off
I did want to make one final post on this monitor. I never did fix this monitor, instead I decided to use the monitor as a learning experience. I completely disassembled the panel. I was curious to see the make up of the inside of the panel. That way, if in the future I have a monitor that needs CCFL replacing I know what to expect. All and all this was a fun project, I'm just a little bummed I wasn't able to fix it.
Even though I wasn't able to fix it, I *believe* I found the problem. The upper inverter would briefly produce an electric noise almost like it was arcing. Also, I was getting some very inconsistent resistance readings from the inverter. So I suspect this inverter went bad.
While working on this monitor there were a few things which struck me.
1. The build quality on this monitor was higher than that of many other monitors. The frame contained more metal and less plastic than you would typically find. Probably my favorite feature was the fact the monitor was assembled using screws instead of plastic tabs - this made it easy to disassemble.
2. The internal components were nicer than I was expecting. I recently got an ESR meter and I went back and retested all the caps in this monitor. They all tested good. I also noticed the caps were high quality caps to begin with. After working on so many cheap monitors like Samsung and ViewSonic it's nice to see one with decent components for once.
I guess both of these are to be expected when you spend a little more for a nicer brand like Sony versus the el-cheapo brands.Comment
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Re: Sony SDM-HS73 on for 2 seconds then off
I did want to make one final post on this monitor. I never did fix this monitor, instead I decided to use the monitor as a learning experience. I completely disassembled the panel. I was curious to see the make up of the inside of the panel. That way, if in the future I have a monitor that needs CCFL replacing I know what to expect. All and all this was a fun project, I'm just a little bummed I wasn't able to fix it.
Even though I wasn't able to fix it, I *believe* I found the problem. The upper inverter would briefly produce an electric noise almost like it was arcing. Also, I was getting some very inconsistent resistance readings from the inverter. So I suspect this inverter went bad.
While working on this monitor there were a few things which struck me.
1. The build quality on this monitor was higher than that of many other monitors. The frame contained more metal and less plastic than you would typically find. Probably my favorite feature was the fact the monitor was assembled using screws instead of plastic tabs - this made it easy to disassemble.
2. The internal components were nicer than I was expecting. I recently got an ESR meter and I went back and retested all the caps in this monitor. They all tested good. I also noticed the caps were high quality caps to begin with. After working on so many cheap monitors like Samsung and ViewSonic it's nice to see one with decent components for once.
I guess both of these are to be expected when you spend a little more for a nicer brand like Sony versus the el-cheapo brands.
Yes, it is too bad that you couldn't repair it. I've seen several sony monitors on this site with problems similar to yours that also went unfixed. Hopefully, someone will find some common part that has failed on these models. Although, it would seem that you've come close with a possible failed inverter transformer. Hopefully, you can find a replacement transformer to prove your theory.Comment
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