Hello to all,it's been ahwile...anyways i,ve opened the panel and visually checked the boards,nothing sems to be buldging or burnt...The screen blinks for a second and goes blank,so i,ve checked caps,resisitors and so forth and have hit a dead end,maybe someone has found a common problem with these lcd's? Any micro info would help,Thanks
Acer p241w
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Re: Acer p241w
Originally posted by Maluko75Hello to all,it's been ahwile...anyways i,ve opened the panel and visually checked the boards,nothing sems to be buldging or burnt...The screen blinks for a second and goes blank,so i,ve checked caps,resisitors and so forth and have hit a dead end,maybe someone has found a common problem with these lcd's? Any micro info would help,Thanks
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. -
Re: Acer p241w
Originally posted by Maluko75Ok hope this works..........>>>>>>>
1. The caps ion both the power supply and inverter are a very good brand. We will assume they are good for now.
2. Are there any components on the back side of the inverter?
3. Measure the resistance between pins 5 and 6 of each of the transformers on the inverter. They should all be very similar.
4. There are two 16 pin ICs on the inverter, I101 and I102. What is the part number of these?
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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Re: Acer p241w
Originally posted by Maluko75Ok the part number for the ic's
l101 oz9938gn/75hpu.2n/0731e
l102 oz9982gn/t10368.2g/0725c1
it's blank underneath, and pin 5/6 show blank,but if you check 1/6 it shows 958,956,961,962 all about 955-964
It would be a real help if you happen to have an oscilloscope and high voltage probe available. How about a spare CCFL tube?
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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Re: Acer p241w
Originally posted by Maluko75Well i don't have neither at the moment, You think the transformers may have changed poles on neg and pos??
Looking at the layout, let's concentrate on T102. C123, R134, and CR102 seem to form a current sense network. C120 may be part of a voltage sense network, possibly involving C123.
In theory this is easy. Measure the voltage at the output of each transformer and the current through each CCFL. Unfortunately, the voltages and frequencies involved makes this difficult. HOWEVER, the components I mentioned above (and their equivalent parts at the other transformers) make it possible to make comparisons EXCEPT that the inverter is only on for a second, and DMMS don't respond fast enough. An oscilloscope would do it; hooking a known good CCFL to each transformer would do it.
There is one more way to do this: Adjust the feedback voltage to the inverter controllers so they 'think' everything is ok, so you have the time to make your measurements. And it will take a few days before I have the time to figure out what how to do that.
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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