Re: ViewSonic VP201B problem
Very clear explanation! Thanks a lot PlainBill
tralala
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Last Activity: 09-06-2010, 02:59 PM
Joined: 01-12-2010
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Re: ViewSonic VP201B problem
I disassembled totally one of the monitors. All wires from inverter to CCFLs seamed good. BTW there is no metal surface they passing by. All is plastic.
I swapped both inverters on this monitor and he gave me same thing. Picture for 1 sec. and.. darkness.
So the rest is to check the voltage from the inverter. Just to confirm, I start to measure the voltage from R1 with ground, then R2 to ground R3 to ground etc. One of them needs to be different then others, right?Last edited by tralala; 02-17-2010, 09:27 AM.Leave a comment:
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Re: ViewSonic VP201B problem
Thanks PlainBill.
"measure the AC voltage from R1 to ground while the backlights are on"
This will be great challenge for me. I like this (and calling 911 if necessary)
Is there other thing I can do before measuring this? You mentioned "The wires often get overheated where they connect to the CCFL" may be I need to start with that. I am not sure how to remove the cover to see this but I will try.
And if the the wires are all OK just buy one inverter and try on both monitor with him.
...Leave a comment:
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Re: ViewSonic VP201B problem
Sorry for the delay. Here is the pictures for both inverters.
Please let me know if these are ok or I need to look for other digital camera....Leave a comment:
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Re: ViewSonic VP201B problem
One monitor goes dead and before I find your forum I just recycling it. For second and third they simply goes dead with same simptoms. Now I have two monitors with same errors at the begginig and I think will be stupid to trow them out (recycling) before ask the professionals.
I made my shot already I changed all caps. As I said I am not prof. Actually there is three "hot" components inverter, logic and PSU. I am ready to shot once again but with what, inverter or logic or..?Leave a comment:
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Re: ViewSonic VP201B problem
I appreciate your response PlainBills. As I said I have two monitor with these problems.
[B]"open or shorted transformer in the inverter"[/B] May I solve this with soldering iron?
or [B]a bad CCFL[/B], sorry but this sound for me as I need to change lamps on this units. I read on the forum that is not so easy and safety.
or some [B]bad wiring to the CCFLs[/B] On two monitors at the same time?Re: ViewSonic VP201B problem
I appreciate your response PlainBills. As I said I have twoLeave a comment:
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Re: ViewSonic VP201B problem
Mistake: DVI, [B]RGB[/B] input gave me same things.
BTW I didn't change the big fat guy on PSU units. I supposed if I have 18V from PSU all is good from there or I am wrong? And, Is the same voltage that came from logical board (18V) to inverter?Re: ViewSonic VP201B problem
Mistake: DVI, [B]RGB[/B] input gave me same things.
BTW I didn't change the big fat guy on PSU units. I supposed if I have 18V from PSU all is good from there or I am wrong? And, Is the same voltage that came from logical board (18V)Leave a comment:
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Re: ViewSonic VP201B problem
Yes, both DVI VGA gave me same thing. Picture for 1-2 seconds and then black screen and power solid green light ;(Leave a comment:
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Re: ViewSonic VP201B problem
I'm sorry. What do you mean with rgb.
ThanksLeave a comment:
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ViewSonic VP201B problem
Hi badcaps guys. Thank you for the great forum.
Here is my first post. I apologize in advance; my English is not so strong and my electricity knowledge also.
I have two VP201B with identical problem.
When I turn monitor on I see black screen and after few second light goes to solid green.
I changed two PSU caps – 680uF, 25V; Inverter caps – 220uF, 25V; Resoldered the inverter's transformers. Checked all ribbon cables. Cleaned the logic board. Voltage from PSU is 17.8 V.
At the end I shortered the two fuses on inverter board.
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