Question about LG Flatron 775FT 17" CRT Monitor
Very incomplete thread..i gotta know 1st what is ur system
configuration..is all ur system is getting power on..is there any light
on cabinet glowing (the power n hdd)..is there is power light coming on
ur monitor..is there any sound coming out of the system..or the set is
considering that the system gets on but u get no display and assuming that the bios has not been flashed in a wrong way & u r a professional..
however, before u proceed to complex checkups..check the mains power supply- the fuse/switch/wirings/power cords/other associate circuits..
probably itz either minor case of loose ram/improper ground/cmos battery..
or major case of faulty or defective smps/cpu/main board short/display adapter or card/monitor
..plz do check the following as in order:..
1) in power on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..
2) if u hv a graphics card, replace with a standby or onboard and see..
3) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..
4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..
5) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..
6) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink Compound" (available in local electronics chip level spare market) between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it tightly in position..
7) the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or pwm switching regulator circuit..look for defective protector-transformer/resistance(esp 4.7k)/mosfet..
8) if itz not the smps, then it must b ur main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(esp above 1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)....
always better to seek advise from ur system admin/vendor....
Posted on Nov 12, 2009
First you have to check that the power is coming in the power board or not if power is coming then interchange the power cable of cpu as well as monitor.after changing the power cable if still not powering on then problem with internal component like that EHT . its better to call engineer for repair
Posted on Nov 12, 2009
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Posted on Jan 02, 2017
You can try DIY repair, but you should read my guide and look at my albums first. Basic LCD monitor and TV troubleshooting guide: Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Basic LCD monitor and TV troubleshooting guide:
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Posted on Dec 11, 2010
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