I got a couple of cheap second hand 15″ Philips 150B LCD monitors recently just to use for testing and working on PCs that don’t normally have a monitor connected.
Both cleaned up like new but one had a faint wavy pattern in the background of the image. This indicates a aging and failing power supply. A few new capacitors and it was as good as new.
I don’t recommend trying this at home. These things can bite – hard.
This is not worth doing as a chargeable job as it would cost more than the old monitor is worth, but it’s worth me spending an hour and a few $ of parts for my own use.
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- Getting in can be tricky
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- PSU board
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- Quite tidy cleaned up
Hi Www2,
Neat Post, Today’s article talks about repairing the CMV 19″ LCD Monitor problems model CM-922D. The complain was no power as what the customer told me. This power supply was not built into the circuit thus it need an external power adapter to power it up. The input to the LCD Monitor is 19V with 3.1 Amp from the adapter. Since the complain was no power, we have to test it out to check if the power adapter is at fault or the LCD Monitor.
Cheerio
Abe, it sounds like a backlight problem. Possibly a CCFL tube issue upsetting the inverter or if the monitor has run for a lot of hours it could be that the power supply to the inverter is noisy and upsetting it. Some of the inverters are quite smart and drive 2 or maybe more CCFL tubes. There are companies that supply new CCFL tubes. Not too expensive but freight to New Zealand is expensive. You have to disassemble the LCD panel to replace the tubes.
I’ve looked at a few monitors with faulty backlights. Here in New Zealand, it’s usually cheaper and easier to get a new or good second hand monitor.
Normally for this BenQ FP71G+ LCD Monitor with the model of Q7T4 the major complaint was display appears for a while and then shutdown (cut off) but for this unit the complaint was dim display! That means you don’t have the chance to see the bright BenQ logo the moment power is “On”. If you look at the screen closely you could actually see the picture except that the display is very dark. If you could see the display, this means that the Main board, power board and the LCD Panel are working!