I traced the circuits down to chip position PC330, it's a rectangular chip with two pins on the north side of the chip and two pins to the south. it's labeled 10425 8178. No clue about this chip but the north pins have voltage (-72 volts) and the south pins have no voltage.
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tlnwiayqydee, In terms of lcd monitor age, unit is VERY OLD. Cold cathode fluorescent lamps will need to be changed for new ones. Very hard to do for consumer/user!!! Best if you trade-in for new unit. Did you even look at the "date of manufacture" on back of unit? Look here for lamp information: www.rexim.com and www.jkllamps.com and www.lcdparts.net and www.lcdrepair.us You will need to also visit YOUTUBE for video clips of units being repaired. 12fixlouie
juanmgerman0, Connect SDM-X82 to known-good pc that has all sleep mode, power-save mode disabled. (turned-off) If unit still goes to black screen mode, then look at the "date of Manufacture" on rear of unit and let me know if you see "2002 -2004" as the year produced. Retrevo lists unit as "time to retire". Power supply may be going into shut-down mode having detected a problem with itself or the CCFL inverter circuit. 12fixlouie
Try checking for a short between pins 2 and 3 on U406. I had the same problem on 3 monitors. I removed this component from 2 of them and replaced it on the 3rd and all three of them work now. I am unsure of this components purpose.
What model do you have? Either way, there should be buttons underneath or at the bottom of the monitor. If not marked, start pressing until one is displayed that shows choices. That would be your menu settings. If you don't need the choice displayed, do nothing and in a few seconds it will disappear.Most likely, the one you need will be in the appearance of a sun or light bulb. The rest of the buttons will allow you to toggle between choices and then adjust up or down (or left and right for positioning). If you don't like changes that have been made, there is always a selection that lets you restore to factory default settings so have fun experimenting.
If you have a display with dual inputs - one for analog (blue cord ends) and digital (white cord endings), make sure you don't choose the wrong input. Your screen will go black until you put it back to the correct input. Let me know if you have further questions.
After looking at the description of the pin outs on the BIT3193 and following signals to/from that chip I discovered I had burned up one of the FETS that I had installed. With the FETS replaced for the second time the monitor works fine now. HEY!!
1. If under warranty, take it to the service center immdtly. 2. The display cable might be loose plug it up. 3. Your system might not be giving signal to the display unit. Is the system running, Listen for a beep when u turn on the system. If there is a beep the System Ok for display or the problem might lies in the Tower itself.
Is the green flashing on the tower or the monitor?
If it is flashing on the monitor, then it might be tht the monitor is not gettign signal from the tower.
To check, disconnect the monitor from the tower and check the monitor. If you get a msg on the screen like no input signal or check video cable, then 99% monitor is fine.
Check for the power supply light at the back of the tower.
Disconnect everything from the computer and then press and hold the power button on the comp for about 30 seconds.
Then connect the cables and check if it is working.
If the LCD has an internal power supply, then the inverter circuit should be on the board as the power supply. If the power supply is external, then the inverter circuit will have it own board.
What is the output of the Inverter circuit? It should have 12VDC going in, but around 50VAC going to the CCFL bulbs.
The "no led" should be a sign. Your getting voltage, but what about current? It still can be the power supply. All LCD monitors should have a "soft switch", or software driven switch to turn the CCFL lamps on and off.
It is hard to find literature on LCD repair, experience is the best teacher on this subject. This might take several emails or postings to help find the answer.
LCD monitors are a computer. You can break them into several parts, Power, I/O, and processing. Power is the easiest to trouble-shoot and repair. Processing is the hardest.
I fixed one LCD monitor by re-seating the software EEPROM. The process could not do its job if it can not read the software EEPROM.
If one of your IC's is shorted, you can always tell using a can of air. Get one of those cans of air and tip it upside down and spray the entire board until it all turns white. Now apply power to the system. If an IC is shorted, it generates more heat than anything else. It will be the first to loose the white condensation. Don't worry this is safe, done it several times.