Question about Gateway FPD2275W LCD Monitor

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Mag Innovison LT917S LCD Monitor

Initally no power light or video. Replaced Power supply electrolytic caps. No change, further troubleshooting revealed 2 of 4 FETS (AO4606) shorted on the inverter section. Replaced shorted FETS. Power light now solid green but video is incorrect. The BIT3193 VDD pin is used by the video control board as a blanking signal. The video is present for about 1 second and then disapears. Each time the screen is unblanked video will appear for one second. It appears the BIT3193 is shutting down but I can't figure which signal is bad, I believe pin 8 and 9 of BIT3193 should be the same. The voltage on pin 8 is about 6 volts and on pin 9 1.3 volts, Pin 9 feeds pin 15 (ISEN) which if I'm right will shut down the BIT3193 until the chip is reset by the removal and application of power (VDD) from the Video control board. I can't find schmetics to help. I used a comparison method to test the transistors on the inverter board which showed they were the same (good). I have run out of Ideas. Help please! Where can I get schmatics? The BIT3193 may have a bad pin 9 or does ISEN pin 15 pull the voltage down? I'm lost now.
Thanks,
Duane

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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!!

Posted on Aug 21, 2008

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