Re: neovo H-W22S black screen
Hello, today I keep the monitor on for more than 30 minutes. At the begin I saw the same problem, but after 30-40 minutes image change in better and it's very very close to perfect image. Please give me an idea. What's can I check?
It's a problem of vga board? Can be a component that when heat work better and so I saw reduced the problem?
alessio211734
Member
Last Activity: 09-05-2018, 01:57 AM
Joined: 08-02-2018
Location: Pisa
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Re: neovo H-W22S black screen
Hello,
I replaced the lamp and assembly the monitor but now I saw some pattern on lcd some vertical black lines. I attached some photos.
And backlight suffer again some problem because sometime monitor stay up for 15 minutes and more and sometime come to black in 1 second....Leave a comment:
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Re: neovo H-W22S black screen
I think I found the solution. I connect one inverter to another monitor lamps and one inverter to lamp1a-lamp1b group and this time lamp1a-lamp1b stay on!
I would like replace my lamps. Do you know where can buy it?Leave a comment:
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Re: neovo H-W22S black screen
Today I extracted the lamps from the LCD,
and I saw that surely 2 are broken I do not know if also 3.
I took 2 photos at the ends of each lamp group.
lamp1a,lamp1b is a group of 2 lamps and lamp2a,lamp2b is the other group of 2 lamps.
Now I would ask if the broken group lamp2a-lamp2b goes off the inverter circuit.
I would like understand if a broken lamp can stop a single inverter or both inverter circuit....Leave a comment:
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Re: neovo H-W22S black screen
Hello,
I found this lamp on eBay I wanted to know if it could work to test the inverter. Should I connect 2 lamps of these to an inverter and the other two lamps of the monitor to the other inverter?...Leave a comment:
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Re: neovo H-W22S black screen
hello,
thanks for reply, I read in another thread where you said that it's possibile to use a resistor
to replace a lamp (you said about 125k resistor 8w).
I would ask you if it's possibile use 10 resistor 1.2 megaohm in parallel
to replace a lamp? I tried to looking for a cfl lamp or a t5 but can't find it
for less than 16 euro.Leave a comment:
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Re: neovo H-W22S black screen
No I have only one test lamp. Laptop lamp I think it's good, because in laptop it was working.
I follow this guide for test Q802 e Q803:
Simply test
a) black on pin S1- red on pin G1 - record ohms
b) black on pin S1- red on pin D1 - record ohms
c) black on pin G1- red on pin D1 - record ohms
Repeat for the "2" pins. That is S2-G2, S2-D2, G2-D2.
Every pair of pin tested have a high resistence between 1 kohm and 1 mega ohm.
I check the voltage on the C802...Leave a comment:
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Re: neovo H-W22S black screen
I get one ccfl from my old laptop and followed this guide to test inverter.
a) TURN POWER OFF and unplug the monitor and wait 1 minute
b) disconnect CCFL #1 and plug in spare CCFL into spot #1
c) plug in monitor and turn monitor on - note if "2 seconds to black" occurs
d) TURN POWER OFF and unplug the monitor and wait 1 minute
e) reconnect CCFL #1 and disconnect CCFL #2 and plug in spare CCFL into spot #2
f) plug in monitor and turn monitor on - note if "2 seconds to black" occurs
...Last edited by alessio211734; 08-07-2018, 08:31 AM.Leave a comment:
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Re: neovo H-W22S black screen
Hello, i tried to do some test.
1. checked SMD FUSE F801 and it's ok.
2. resoldering T801 and D906 but monitor still has the same problem.
3. Misured resistance between 7 and 8 on inverter transformers T801 and T802
and had these results:
T801 0.474 kohm
T802 0.477 kohm
I tried to take a picture about IC801 but it's not so easy. I think maybe a TL494
After this I take a picture about Q802(9945N) and Q803(9945N) can you confirm that are in the red circle?
I could even try to unsolder these...Last edited by alessio211734; 08-05-2018, 10:55 AM.Leave a comment:
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Re: neovo H-W22S black screen
Thanks for reply, I checked the two fuses and they are ok. I upload a new photo in high resolution about solder side. Next steps?...Last edited by alessio211734; 08-03-2018, 01:53 PM.Leave a comment:
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neovo H-W22S black screen
Hello everyone,
I have a problem with a neovo H-W22S monitor.
When I turn on the screen, the image is visible for an instant
and then disappears. If I go to light up the screen with a flashlight with much difficulty
I can see the image. The monitor led remains on.
I unmounted the monitor and took some photos of the power board.
I add a video link to better understand the problem [url]https://www.youtube.com/watch?v=ycyOaCCMXHQ&feature=youtu.be[/url]
Capacitors do not seem swollen. What could I verify?https://Hello everyone,<br /> I have...m with a neovo...Last edited by alessio211734; 08-02-2018, 08:40 AM. -
Re: New Members - please post your introductions here
Hello everyone,
I write from Italy, I am a software developer and
I have a diploma in electronics.
My first pc is a commodor 64 and I had a 286 16 mhz, 486 ... and so on
I am here to learn new things and how repair my device.Leave a comment:
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