Hello all, I am new to this forum though not to electronics.
Samsung Syncmaster 2333 made in September 2009. If it sits by itself, with no input signal, I get alternating Digital and Analog input decals on the screen. As soon as I connect a known good signal, I see a white line for a second and screen goes gray. Backlight is alive, power on LED is on.
Caps on the power supply are SAMXON in the inverter section and Lelon or the like in the Secondary side. No signs of bulging or venting. All power rails look happy and clean with a meter and scope. I see no ripple, pulsing or the likes. The digital board gets clean 5V and makes normal looking 3.3 and 1.8V. I see clock (14.3Mhz) on the main controller. I see data and clock wiggling on the SPI flash and EEPROM next to the controller, so I assume its booting alright. I also see VGA and SYNC signals on its pins. I just don't get any output. It appears capable of at least drawing the searching for input decal on the screen, so the LVDS section seems fine. If I disconnect inputs and hold menu button I get Test Passed message. Other menu buttons do not seem to do much. Power button works fine. I did test both DVI and VGA inputs with the same result
The chip does run a bit warm- I'd say 50C. Not finding anything else wrong with the system, I've swapped the controller. The soldering job is less than stellar- chips pins were a bit bent when I got it, but I am pretty sure everything is connected and there are no shorts. Or at least that's what a look under a microscope indicated. End result is the same, so that was obviously not an issue. Any pointers?
Samsung Syncmaster 2333 made in September 2009. If it sits by itself, with no input signal, I get alternating Digital and Analog input decals on the screen. As soon as I connect a known good signal, I see a white line for a second and screen goes gray. Backlight is alive, power on LED is on.
Caps on the power supply are SAMXON in the inverter section and Lelon or the like in the Secondary side. No signs of bulging or venting. All power rails look happy and clean with a meter and scope. I see no ripple, pulsing or the likes. The digital board gets clean 5V and makes normal looking 3.3 and 1.8V. I see clock (14.3Mhz) on the main controller. I see data and clock wiggling on the SPI flash and EEPROM next to the controller, so I assume its booting alright. I also see VGA and SYNC signals on its pins. I just don't get any output. It appears capable of at least drawing the searching for input decal on the screen, so the LVDS section seems fine. If I disconnect inputs and hold menu button I get Test Passed message. Other menu buttons do not seem to do much. Power button works fine. I did test both DVI and VGA inputs with the same result
The chip does run a bit warm- I'd say 50C. Not finding anything else wrong with the system, I've swapped the controller. The soldering job is less than stellar- chips pins were a bit bent when I got it, but I am pretty sure everything is connected and there are no shorts. Or at least that's what a look under a microscope indicated. End result is the same, so that was obviously not an issue. Any pointers?
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