The backlight in my old Acer monitor is only half-lit and there comes a 50 Hz buzzing sound from the inverter transformers.
The LCD image itself is fine.
What could it be, the CCFLs, the inverter or the power supply, does anyone know? Are the CCFLs OK?
Hi,
I'm sorry for writing in English, but I don't understand any single word in Hungarian and I couldn't find an English subforum there.
I have changed the LVDS controller and now it's working perfectly, but I need help with the backlight. The CCFL lamps in the screen are OK. I connected the screen to another inverter (from BenQ T705, made on TL1451 which also has "protect" function) and the backlight worked perfectly. Again, I connected other screen to the malfunctioning ILPI-075 inverter and the screen also goes blank.
I changed all THT electrolytic capacitors on the board, but not much has changed. Before, the backlight was turning off almost immediately, now it glows for 1-2 seconds and then turns off.
The HV side of inverter transformers is about 470 ohm, they look OK.
I measured random capacitor in the +16V line, which is supplying the high voltage inverters.
We can see how the voltage went down while the backlight was powered on.
Also, the ON/OFF signal on ICL837's pin 8 is always present after powering up the power supply, even after the backlight turns off.
I don't have any idea what to check now..
Kedves elektro tanyázók az adott hangpanel beépítve van a monitorban , az alapvető nagy kérdés az lenne milyen háromlábú állat lenne a panelt meghajtó kapcsoló üzemú táp IC Mivel szublimálódot a fenn nevezett háromlábú állat tokozásának írott fele ezért nem tudom a típusszámát , ha valaki javított ilyet és emlékszik a táp iC típusára megköszönném a megosztását a tudásának.
Üdv: teodor.
T. Kollégák!
Keresem a tárgybeli monitor inverter rajzát. Az a gond, hogy az OZ960G-s ic megkapja az indításhoz szükséges 5V-t, meg is jön a driver jel, de a trafókra a táp nem jut el, mert a kapcsoló dual fetek nem kapnak vezérlést. Elég nehéz végig követni, hogy mi miből következik.
Előre is köszönöm.
Üdv,
Elbandi.