Re: Hp L1925 lcd monitor black screen
Which one is it? can`t see it.
Which is the mosfet?...
mats23
Member
Last Activity: 06-09-2012, 03:25 AM
Joined: 05-30-2012
Location: piatra neamt
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Re: Hp L1925 lcd monitor black screen
They are 573 and 574-5.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
just a question.... since i have got 2 1000uF 16v caps bught.. and all the tools necessary to replace... may I replace the 2 rubycon caps...? What is the probability to be broken?Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Both measured between 500 and 600 (~575); no, they do not have numbers on their edges.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Here you go... the inverter board.
[ATTACH]41299[/ATTACH]
[ATTACH]41300[/ATTACH]
the resistor... is 0.42 ohm with 5% tolerance.
you can see it under 4 bands resistance but mine has also a thin black line after the golden...
[url]http://www.hobby-hour.com/electronics/resistorcalculator.php[/url] I have used this site, but it says it`s not standard and it`s calculated as a 4 band resistorRe: Hp L1925 lcd monitor black screen
Here you go... the inverter board.
[ATTACH]41299[/ATTACH]...Last edited by mats23; 06-06-2012, 08:56 AM.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
The resistor beeps when on continuity.... on 200 shows 00.4 00.5 00.3 the lines on it are yellow red silver gold and black.
which is the inverter?Leave a comment:
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Re: Hp L1925 lcd monitor black screen
- .006 to - .010Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Either the meter i have is not good.. either the component is with problem... i do not get any numbersLeave a comment:
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Re: Hp L1925 lcd monitor black screen
Fine, I`ve took pictures from the inverter board now. it has been previously fixed.. or that`s how it looks.. the blue wire goes to pin no 3.
[ATTACH]41264[/ATTACH]
[ATTACH]41265[/ATTACH]Re: Hp L1925 lcd monitor black screen
Fine, I`ve took pictures from the inverter board now. it has been previously fixed.. or that`s how it looks.. the blue wire goes to pin no 3.
[ATTACH]41264[/ATTACH]
[ATTACH]41265[/ATTACH]...Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Here is the inverter board.. hope this is the one.
[ATTACH]41263[/ATTACH]
the thing is that the display is functioning... in the sense that i have seen image forming there.. but the pixels lack light...Re: Hp L1925 lcd monitor black screen
Here is the inverter board.. hope this is the one.
[ATTACH]41263[/ATTACH]
the thing is that the display is functioning... in the sense that i have seen image forming there.. but the pixels lack light......Last edited by mats23; 06-05-2012, 08:49 AM.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
On the white thing is says 0204A1207
040020511-01o1
i have tested.. and shows nothing... no reactionLeave a comment:
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Re: Hp L1925 lcd monitor black screen
Here are the pictures with the power board. sorry for the blury qual but that`s preeety much the best in fast manner.
[ATTACH]41253[/ATTACH]
[ATTACH]41254[/ATTACH]Re: Hp L1925 lcd monitor black screen
Here are the pictures with the power board. sorry for the blury qual but that`s preeety much the best in fast manner.
[ATTACH]41253[/ATTACH]
[ATTACH]41254[/ATTACH]...Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Well thanks for the reply; I have managed to find the thin screwdriver...so I have unscrewed to a point I cannot go further thus.. it is impossible to get to the lamps.
Will do try to get some pictures posted!
I have reached a circuitry that looks perfectly clean with a chipset CHIMEI(irrelevant probably). From this further on I may need to open the 7 or 8+ clips frame for me to get a clear view of the lamps or what's inside.
will get a meter tomorrow and measure the inverter... must-it be done while the inverter...Leave a comment:
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Re: Hp L1925 lcd monitor black screen
OK... I`ve starded opening even more the lcd... got suck with this fine cross screws I do not hold for the moment.. will get to it and open even more... i hope it`s the lamp...or the burnt wire...
Thought about it... highly unprobable to be the lamps.... does not have 2 lamps?? if one is burnt.. then it sould be light only from one end... right?
still thinking about the rubycon caps...Last edited by mats23; 06-04-2012, 12:25 PM.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
Ok, I have done it! It does function.... i have seen it reacting.. so it gets signal but there is no light...
It May be the back-light? should I change the two Rubycon unswallowen caps or check the backlight lamp?Last edited by mats23; 06-04-2012, 11:49 AM.Leave a comment:
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Re: Hp L1925 lcd monitor black screen
yes, I have checked that they are genuine(seen the badcaps blacklist first)!
the answer is no, i do now have old lcd nor bulbs. The boards, all three do not present any burnt marks or signs of physical stress.
The breakdown happened in front of me, i haven`t sensed any burned smell. the monitor had a high pitch sound all the time before(couple of years). In fact, if I remember right the phone called just before this happened. it was just under the monitor... is it possible to have had any effect? i doubt it, cuz it...Leave a comment:
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Re: Hp L1925 lcd monitor black screen
The caps i was about to remove (previously changed) are Rubycon... changed my mind...
Leave a comment:
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Re: Hp L1925 lcd monitor black screen
I have the same monitor, stopped working all of a sudden. (shortly after i ran a software calibration test)
Unfortunatelly, I havent cheched with a flashlight to see it there is something there, but the symptoms are: black screen, led green acting like nothing happened. There is signal in video card(I was running dual view - both ports are fine). Power+ signal cord seem fine.
I have open the monitor: 100% taicon caps, except few(3) that my suspicion were replaced previously since I have bought it SH couple of years...Leave a comment:
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