Question about HP Pavilion F1703 17" LCD Monitor

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Same... What is the push-pull transistor?

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In a CRT type monitor/TV the push-pull transistors are used in the vertical output section to provide both poistive and negitive signal amplification. By using a NPN and PNP transistor set you can amplifiy a signal that goes positive and negitive. A NPN uses the positive portion of the input signal and then amplifies that signal (pushing it to a higher positive signal level)(PUSH). The negative portion of that same signal to sent to a PNP transistor to amplify the negative to a more negative value PULLing the signal lower/more negative). The out puts of both transistors are combined providing a PUSH-PULL transistor set.
Now days the use a chip with all the transistors and a lot of the associated components inside. The LCD I worked on used FET's N-type and P-type (negative and positive).
I hope this helps.

Posted on Aug 26, 2008

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My monitor is on but the backlight is off. When you swicht the monitor at first, the lights come and go. I did check the inverter side and i fund out that pair of the driver transistors were dead. I did...


When you replace the transistors you should change all 4 of the C5707 transistors. You also need to resolder all of the connections to the 4 output transformers and the 4 output plug connections. If you did not resolder the these additional connections then the new transistors you install are more the likely dead now. The solder joints can crack because of the current and this causes the circuit to pull more amps than the transistors can handle. The new ones will blow within 2-3 seconds if you did not resolder the other connections.

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BenQ Q24W5 LCD monitor circuit diagram


HI.............


Repairing BenQ 17′ LCD Monitor

benqlcd.jpg
I came across a common fault problem in BenQ 17′ LCD Monitor. The problem is have power but no display. Once you has opened the LCD cover, check the pico fuse for open circuit (very common), the push pull transistors C5707 for short circuit and the Buck royer circuit p-channel fet FQU11P06 also for short circuit too. For your information, if you can't get the FQU11p06 you can always use FU9024N as a replacement. Resolder all the high voltage transformer pins and replace the components above and I'm sure you will bring back the life of this BenQ 17′ LCD Monitor.
You may go to this fairchild semiconductor website to download the spec of the FQU11P06 P-channel FET.

http://www.fairchildsemi.com/ds/FQ/FQU11P06.pdf


GOOD LUCK.............

Sep 23, 2011 | Computer Monitors

1 Answer

Repair BenQ Q24W5 monitor


HIIIIIIIII...................


Repairing BenQ 17′ LCD Monitor

benqlcd.jpg
I came across a common fault problem in BenQ 17′ LCD Monitor. The problem is have power but no display. Once you has opened the LCD cover, check the pico fuse for open circuit (very common), the push pull transistors C5707 for short circuit and the Buck royer circuit p-channel fet FQU11P06 also for short circuit too. For your information, if you can't get the FQU11p06 you can always use FU9024N as a replacement. Resolder all the high voltage transformer pins and replace the components above and I'm sure you will bring back the life of this BenQ 17′ LCD Monitor.
You may go to this fairchild semiconductor website to download the spec of the FQU11P06 P-channel FET.


http://www.fairchildsemi.com/ds/FQ/FQU11P06.pdf



GOOD LUCK............

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1 Answer

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On the monitor power board you find an IC called push pull transistors,it is usually paired get to read this IC with your miter a pair of this IC must have gone bad.If dictected replace it, then power the power board and it will display normal.Thank you Jesus.

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1 Answer

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hi,
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ok
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