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Me neither....
This board has different (more) components on it. Like i mentioned at the beginning of this thread.
And i don´t like to order this from china.....
Did you mean the samsung or the Phillips. I was thinking of the phillips one. Tom and Bud were probably your best bet skimming through checking all the remaining big components
would seem to be all that is left. You tetsted some of the the fusible resistors but did you check them all?
Will check them again. It´s been a long time since i had a look at it. Mostly because i (or the PSU) fried the little IC again and i had to order new ones. Maybe that is a hint?
What do you think about the SMD stuff on the bottom side. Thats a lot! to check....
Yes- that why I said large components. Unless they have changed colour considerably
its a matter of testing every one for short than removing and re-testing - needle in a haystack job.
So far i´ve checked every fusible resistors and diodes on the front side. I´ve also tried to power the board with external 5.2V. 5.2V->100R->PS-On With no success. Does this mean the fault is definetly in the 12V/24V section?
Hey its me again with another approach ;-)
I have finally found some scematics of the PSU. This one is from a benq with different names/numbers on the parts and even some different parts but the cirquit is pretty much the same. Especially in the standby section....
Anyway, this makes me belive that i need to have 5v standby instead of 3v(like its in my case)
HV input is present. There are no 5v between pin 2 and 4 on coil T2.....even with those pins lifted up. Maybe one of you experts can have a look at the scematics and give me a hint where to look?
Wille post more pics if requested.
Thanks in advance
Great!
If you only get 3V instead of 5.2V, places to check are:
- caps C9340, C9341
- inductor L9304 (should be short circuit)
- IC AZ432
- Optocouplers
However, I do notice, there is a Q9301, which when turned on, will reduce the output voltage. This is controlled by a pin, DV5. High on here indicates lower output voltage.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Have you tried using Firefox or Chrome?
I can upload it to tgohome.com. Los Angeles server should be fast for you .
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
The SCH shows Q9301, R9339, R9341, R9340 as NC (NOT CONNECTED/NOT USED).
Check ZD9303, OPTO IC9303, REF DIODE IC9304 as Tom suggested.
The more PIN4 (FB) switng toward ground (less voltage), the less output voltage you will get. Check voltage between pin2 and 3 of ref diode IC9304.
When the output voltage tries to go up, the Opto will turn on more to keep the FB pin low.
Great!
If you only get 3V instead of 5.2V, places to check are:
- caps C9340, C9341
- inductor L9304 (should be short circuit)
- IC AZ432
- Optocouplers
However, I do notice, there is a Q9301, which when turned on, will reduce the output voltage. This is controlled by a pin, DV5. High on here indicates lower output voltage.
The caps and the inductor are fine. We checked IC AZ432 before (Post #93).
Just because it's not connected on that model doesn't mean this board doesn't use it...
Opto test requires two meters with diode test. One meter on one side measuring opto diode drop and providing test current. Other device to measure output current.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
"Oops! Internet Explorer could not connect to www.iernut.bugs3.com"
Though I rarely use IE 8 now, it works fine for me.
I used Opera 12.15 to download and re-upload pdf.
--- begin sig file ---
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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