I see that the typical problem with this board (used in a Sharp LC-52E77UN) is the loss of the 5V standby and there is a kit for the replacement components. I checked those components and they are good, and I have a solid 5v standby. I have a schematic for the CPU board, but not the Delta DPS-286AP board. There is a lot of voltage error checking (monitoring) done from the CPU, and the LED blink codes indicate no UR10V or AV9.
If I bench test the Delta board and use a 1K pull-up resistor between the 5v and PS_ON signal pin, I can hear the enable relay click on. I've checked the accessible diodes and TIP31 and found them all to be functional.
There is a PQ30RV31 4 terminal regulator that is not getting voltage to its input. I could really use a schematic of this board before I go poking around on the primary side. Anyone familiar with this board or have a schematic?
Mac
If I bench test the Delta board and use a 1K pull-up resistor between the 5v and PS_ON signal pin, I can hear the enable relay click on. I've checked the accessible diodes and TIP31 and found them all to be functional.
There is a PQ30RV31 4 terminal regulator that is not getting voltage to its input. I could really use a schematic of this board before I go poking around on the primary side. Anyone familiar with this board or have a schematic?
Mac
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