Having problems with your HP Pavilion F1903 19" Flat Panel LCD Monitor ?
Testing C5707 Transistors on Benq Inverter Board
\015 Hello everyone,\015\012\015\012\015\012I have a faulty HP 1940 with a Benq\015\01248.LIG02.A01 inverter board. It has the fault where it the screen\015\012goes black after a few seconds, after putting a flash light to it I\015\012could see that the image was still there. i Opened it up and\015\012inspected the inverter board I could not see any faulty caps and the\015\012soldering looks good to me (I'm a novice) so after reading through\015\012the posts here I decided to pull the four C5707 transistors off the\015\012board and test them with my DMM, as I have read here that these\015\012transistors are a common fault with this board. Because I have\015\012little experience testing transistors I was hoping for some\015\012conformation from the experts (you)\015\012\015\012\015\012\015\012I pulled 4 transistors off the board\015\012and kept them separated in pairs as I'm told the fail in pairs.\015\012\015\012\015\012The first pair gave me the following\015\012results (all tested with the diode function on my DMM)\015\012\015\012\015\012Transistor 1 (first pair)\015\012\015\012\015\012B-E .575 v\015\012B-C .575v\015\012C-E Open\015\012E-C Open\015\012\015\012\015\012Transistor 2 (first pair)\015\012Same as above\015\012\015\012\015\012Transistor 3 (second pair)\015\012B-E 0.00v (it did not read 0L )\015\012B-C .349v\015\012C-E .349v\015\012E-C .360v\015\012\015\012\015\012Transistor 4 (second pair)\015\012B-E 0.00v (it did not read 0L )\015\012B-C .444v\015\012C-E .478v\015\012E-C OPEN\015\012\015\012\015\012it seems to me that the second pair is\015\012faulty I was wondering if anyone can confirm this? I have found a\015\012place on ebay where I can order some new C5707s. Also As a precaution\015\012I have touched up the soldering on all the transformers in case this\015\012was the cause of the fault. Anything else I should check?\015\012\015\012\015\012Thanks heaps for all the great tips I\015\012found here I would never have tried this without the advice I have\015\012found on this site.\015\012\015\012\015\012Mike\015
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Testing C5707 Transistors on Benq Inverter Board
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Problem for BenQ FP767 Power light does come on, image is there if a light is shined on the screen, i have swapped the 4 2sc5707 transistors as suggested in other posts. Still the same problem, further testing shows no power in the entire area around the transistors (tested across the majority of surrounding connections). Could there be a further problem and is it possible to obtain a board diagram so i can try and track the point of power loss?
Change the board ... BenQ FP767 17" LCD Monitor
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Sorry for the late reply, I was sent away for 2 weeks in the middle of nowhere.\015\012\015\012Anyway to the problem at hand..\015\012\015\012The transistors are easy to check. They have 3 legs so think of them as 1, 2 (middle ... BenQ FP767 17" LCD Monitor
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BenQ FP767 17" Power but no display?
Different faults here.\015\012First fault is no power, it is bad capacitors on the power board.\015\012\015\012Second & third faults are the inverters. (power but no image visible, but feint if you shine a light into the screen) ... BenQ FP767 17" LCD Monitor
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Powers on ,no picture - HP Pavilion F1903 19" Flat Panel LCD Monitor
I will assume that you already try it on another PC and still get the same symptom. You will have to open it up and look for bad solder connection in the backlight inverter board, burnt parts, shorted transistors, bad inverter transformers, bad lamps ... HP Pavilion F1903 19" Flat Panel LCD Monitor
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Your model number indicates the LCD is made by BenQ. This model is known for poor solder connection causing the inverter driver transistors to short, resulting in immediate shutdown if the inverter circuit. Disassembly and testing the transistors is ... Computer Monitors
BenQ FP767 17" LCD Monitor Problem - Power LED Blinks
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