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PostPosted: Wed Oct 24, 2012 5:52 am    Post subject:

If I put a precharged battery onto the board, it'll let me fire it up and it'll also then detect AC-in. However it does not seem to -charge- while on. Soon as the battery goes flat, the whole system shuts down. It would seem there's a problem with the AC-supplied-DC-input side
PostPosted: Wed Oct 17, 2012 7:08 am    Post subject:

i have a hp7540 Crt moniter getting nosie "FBT"
ineed a help how to repair or give me a solution. please ... Rolling Eyes
PostPosted: Tue Jan 12, 2010 1:13 pm    Post subject: HP 7540 FREQUENT PROBLEM.

Anybody who may kindly help me to fix this type of problems always very common to this hp 7540 monitor.
1) Turning the power on and then green led will show blinking light and then off again and then on again over and over, the H-out transistor is ok, tried to swap in another flyback transformer from a working one but same, anyone who might have good idea what could be the problem?
2) another problem is, the green led is on but it is little bit dim light and there is no display or raster showing. I measure the secondary output voltage like 12volts it shows only around 7 or 8 volts.
PostPosted: Wed Dec 05, 2007 10:40 am    Post subject: check transistor c5929

the horizontal deflection transistor C5929 is shorted, replace with new one.
PostPosted: Tue Jul 03, 2007 10:57 am    Post subject: hp 7540 monitor

I have an HP 7540 monitor which is not switching on and produces a ticking sound. I need help to fix it. Rolling Eyes

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