Re: view sonic vx2035wm flashing blue power lite dark svreen
thanks, I'll work on tomorrow and report back
thanks, I'll work on tomorrow and report back
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Re: view sonic vx2035wm flashing blue power lite dark svreen
That would explain some of the fluctuating voltages on pins 4-9 (as per schematic - your pin numbering might be backwards). Pin 1 is stable at 15.5V DC.Originally posted by Jwh8000 View Post
That is why I suggested #5 to doublecheck all your solder work especially in this area around D812, C823, C825, C822, and R833.
Some of things I'm asking you to check is more for verification. I have an idea what to expect for #1 to #4, but it is nice to have confirmation.--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
I wasn't able to get the voltage reading since I have to get them off the bottom of the card and I cann;t get to the test points with the cables connected.
the readings for I801 g to pin 6 is .417m
D810
.214
.909
.214
.909
D812
.220
lnf
.219
inf
I'm not an electronics expert but I would expect to see the same readings on both. I would expect to see inf on the reverse readings so maybe D810 has a problem.
I did the reading using the center pin and going to the outside pins. I hope that was the correct way to measure the dioads.
Did I mention that when the signal cable is disconnected the voltages settle in and the blue flashing lite goes solid orange.
All my soder points are fine and making good connections.Comment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
You were corect I did have P801 connecters reversedComment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
I use cardboard for separation and to make sure the board doesn't short out. This allows you to test boards upside down and get the voltage measurements.Originally posted by Jwh8000 View Post
All those readings indicate the diodes are good. A diode allows current flow in one direction so it should measure between 0.2 and 0.5V one way and infinite in the other. 0.909V is "close enough" in this case to infinity.the readings for I801 g to pin 6 is .417m
D810
.214
.909
.214
.909
D812
.220
lnf
.219
inf
I'm not an electronics expert but I would expect to see the same readings on both. I would expect to see inf on the reverse readings so maybe D810 has a problem.
If a diode read the same in either direction, it is shorted.
Not that I remember.Did I mention that when the signal cable is disconnected the voltages settle in and the blue flashing lite goes solid orange.
Which one do you call the signal cable?--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
analog computer cableComment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
What happens if you use the DVI cable instead?Originally posted by Jwh8000 View Post--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
same symtomsComment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
16.4 volts across c809
16.4 volts on I801 pin 4 and 6Comment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
Those readings indicate that the SMPS IC is working fine as per page 5 ofOriginally posted by Jwh8000 View Post
http://pdf1.alldatasheet.com/datashe...C2/LD7575.html
Can you post a clear focused picture of the main board (front and back) as close to 2000x2000. Use macro mode if your camera has one.--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
is the main board the power board the one we have been working on?Comment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
Main board has the hdmi, rca connections. The 2 previous photos you have are not clear enough to make details (all fuzzy). It should be like this clear so we can make out all the detail and suggest test points.Originally posted by Jwh8000 View Post
https://www.badcaps.net/forum/attach...0&d=1290283049--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
I got a better pic for youAttached FilesComment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
I forgot to point out that sometimes in circuit readings are not 100% accurate and you have to desolder the component to get an accurate reading.Originally posted by Jwh8000 View Post--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
1) Okay, that new picture helps. Unfortunately, I don't spot anything obvious that is wrong.Originally posted by Jwh8000 View Post
2) My best guess right now is that something is wrong on the main board if the analog and DVI signal cause the voltages to fluctuate. Since you say the voltages are stable when there is no connection, it sounds like the main graphics chip might be shorted internally?
3) A really long shot would be to recap the entire main board?
4) I'm out of ideas for now.--- begin sig file ---
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Re: view sonic vx2035wm flashing blue power lite dark svreen
Let me think about it but I may just give up on for now. You were very helpfull and I wouldn't have goten this far without your help.
One other thing I noticed that even with the voltages stable I was never able to bring up the menu and when I turn on the monitor without the analog cable connected I get a message on the screen that states no signal analoge cable disconnected then it goes away.Comment
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Re: view sonic vx2035wm flashing blue power lite dark svreen
That is normal for most monitors - without a signal you are unable to access the menu.Originally posted by Jwh8000 View Post
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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