Hi, I'm new on this forums and I've already fixed several LCDs, PSUs and MBOs replacing bad capacitors. But, I'm unable to fix this LED screen by myself.
LED monitor is Philips model 226V3L, with AU Optronics M215HW03 V1 panel.
No sign of life after connecting to mains. Worked flawlessly, one day just wont power on.
Power supply board is 715g4497-p03, no bulging caps.
connectors on it are CN804 6pin which goes to LED panel (probably backlight);
and CN902 which connects to control mainboard, pins: DIM, ON/OFF, GND, GND, 5V, 5V, VOL, MUTE. Just to notice, screen doesnt have speakers.
Control mainboard is 715G4401-M03 with Novatek NT68660UFG MCU.
Google show that is ViewSonic board, so probably Philips used ViewSonic LED screen controller?
connectors on it are CN701 which connects to power supply board CN902;
and CN404 which connects to 715G4921-K02 key board switch which have power button and power LED.
I have basic multimeter, and first thing I do was checked voltages.
It seems that only 5V is going to control mainboard, checked that rail and it's rock-stable at 5.02VDC.
I also tested the wiring of switch keyboard pcb, seems OK.
Considering U401 Novatek IC and R707 4.7Omh resistors are getting warm when power is plugged in, I'm assuming control mainboard is dead?
I don't think it's normal for that components to get hot, especially when screen is not powered on and it's "green energy, low-consumption standby model"... Is there any chance of fixing it? With your help, I can test components on control mainboard, find replacement and resolder it.
Pictures of power supply and control mainboard are in attachment. If needed, I can take more pictures, just say.
Thanks in advance for every suggestion.
LED monitor is Philips model 226V3L, with AU Optronics M215HW03 V1 panel.
No sign of life after connecting to mains. Worked flawlessly, one day just wont power on.
Power supply board is 715g4497-p03, no bulging caps.
connectors on it are CN804 6pin which goes to LED panel (probably backlight);
and CN902 which connects to control mainboard, pins: DIM, ON/OFF, GND, GND, 5V, 5V, VOL, MUTE. Just to notice, screen doesnt have speakers.
Control mainboard is 715G4401-M03 with Novatek NT68660UFG MCU.
Google show that is ViewSonic board, so probably Philips used ViewSonic LED screen controller?
connectors on it are CN701 which connects to power supply board CN902;
and CN404 which connects to 715G4921-K02 key board switch which have power button and power LED.
I have basic multimeter, and first thing I do was checked voltages.
It seems that only 5V is going to control mainboard, checked that rail and it's rock-stable at 5.02VDC.
I also tested the wiring of switch keyboard pcb, seems OK.
Considering U401 Novatek IC and R707 4.7Omh resistors are getting warm when power is plugged in, I'm assuming control mainboard is dead?
I don't think it's normal for that components to get hot, especially when screen is not powered on and it's "green energy, low-consumption standby model"... Is there any chance of fixing it? With your help, I can test components on control mainboard, find replacement and resolder it.
Pictures of power supply and control mainboard are in attachment. If needed, I can take more pictures, just say.
Thanks in advance for every suggestion.
Comment