Re: Wiewsonic VE710b black screen Flashing
Hello
I repaired an other one.
2 on 4 but I do not have transistors anymore to be cannibalized.
Still one thank you.
Nice day for you.
rogebe
Member
Last Activity: 02-14-2022, 12:46 PM
Joined: 02-17-2014
Location: bouligneux
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Re: Wiewsonic VE710b black screen Flashing
Hello,
I have to go back up the board and the screen works again.
Thanks to all those who gave me somme ideas to repair.
Finally I have to change two transistors (Q10 and Q11), C3, to check condensers yellow and to resolder transformers.
Well I have two similar screens to be repaired.
Coming up next.
Good day.
RGBLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
UpLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello guys,
I had no answer to my last questions.
Needs it to make the other thing ?
Thank's for you answers.
Good day.
RGBLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
I resoldered the two inverter transformers.
I measured the two yellow caps: 0.211 (scale 2uF).
I changed C3.
Good day for you.
RGBLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello,
Before switch on the board I think resoldered both inverter transformers.
As I have two same boards (in fact, I have 4 same screens), I took transistors and yellow caps (0.22µf) which was good to replace on the other board.
But I am going to unsolder the yellow caps and to verify their value
However I do not see these transistors " 100179 " ?
The reflextion on the post 23 is right ?
C3 is very important for Royer Oscillator ?
...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Ok Budm,
I made a photo
In red the condensers which are before D108. It is a s à high voltage power rectifier. He has to feed both Royer Oscillator (inverters).
Transistors on the right was OK. Those on the left not
Normally caps in the red circle must be good
Rest C3 and C108 has to change
I am clear ?
It is right ?
Thank's for you answer.
RGB...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello budm,
You are right, the condenser C3 seems bad (the eye of master !)
For the yellow cap, I put it a which was between two good transistors.
Something else ?
Nice day to you.
RGB...Leave a comment:
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Re: Acer AL2416W -- Backlight goes out
Thank you budm, I do not know how to take myself with these wiewsonic.
I am already satisfied to have been able to run the AL2416W.
Good day.Leave a comment:
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Re: Acer AL2416W -- Backlight goes out
Hello budm,
As expected, I changed mosfets, caps ...
It seems OK and the screen works correctly
A big thank you for your help.
But I still need you.
Could you give me somme ideas for this problem :
[url]https://www.badcaps.net/forum/showthread.php?t=36826[/url]
Thank you for your answers and for your help.
Good day
RGBRe: Acer AL2416W -- Backlight goes o... As expected,...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello everybody
I do not know really any more how to solve my problem.
Somebody would have an idea ?
Thank you for your answers.
RGBLeave a comment:
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Hello Budm
I open à new post for a trouble with à screen wiewsonic VE710b
See :
[url]https://www.badcaps.net/forum/showthread.php?t=36826[/url]
Rtech gave me some indications but to day I am lost. I dont know that I do to solve my trouble.
Have somme idea ?
If you want you can send me a personnel message.
Thank's for you answer.
Good day for you.https://Hello Budm<br /> <br /> I ...?t=36826[/url] -
Re: Wiewsonic VE710b black screen Flashing
Hello,
Excuse me for this silence I had some problems of connection.
But I admit that I am lost. I do not know that I do.
I try to think about a method of test to solve my problem.
Thank's for all informations that you give me but if you have any suggestions you can give please let me know.
Nice week end.
RGBLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello,
It's that possible to measure the CCFL to verify that it works ?
If I understood well. You ask me to try on an exit then on the other one.
I think that I can try on the exit that transistors burn out.
Finally I have a last question. Can i try the CCFL on a bigger screen. I have one with the power is OK. Like that I can test it.
Can I connect the power with one CCFL ? It is going to destroy the circuit ?
Thank's for your answers.
RGBLast edited by rogebe; 04-16-2014, 02:07 AM.Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
I have a ccfl which comes from a bad screen (a vE710b) !
RGB...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
What do you think of that ?
RGB...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Hello,
I test L2 and L3. All are 3 ohms.
I test D4 and D12. It's ok for the 4.
D108 is à high voltage power rectifier. It's impossible to verify without unsolder.
That you think, it is necessary to verify ?
It could not be a bad transformer or CCFL ?
Good evening
RGBLeave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Ok
It's good ?
RGB...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
Oh excuse me.
I don't understand that you want.
And this ?
RGB...Leave a comment:
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Re: Wiewsonic VE710b black screen Flashing
And the second board
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