Sharp Power Supply Repair IC7905

[spicedrvr]

I'm having a problem with a Sharp Power Supply P/N DPS-485BP-1 A.

IC7905 TNY264PN and R7914 were blown. New Parts did not fix the problem. Other Sharp Power Supply Boards use these same components for the 5V Standby. Please help with a solution, schematic, or source for a replacement Board. Model Number is LC-65E77UM. Thanks.

[budm]

Re: Sharp Power Supply Repair IC7905

Is this you board?
http://www.shopjimmy.com/sharp-rdenc...unit-board.htm
Pictures of your board top and bottom side?
How about other low Ohms resistors in that section, I.E. R7918, R7853, etc.

[spicedrvr]

Re: Sharp Power Supply Repair IC7905

Is this you board?
http://www.shopjimmy.com/sharp-rdenc...unit-board.htm
Pictures of your board top and bottom side?
How about other low Ohms resistors in that section, I.E. R7918, R7853, etc.

That's the one. Those resistors are good. I have a working DPS-286AP that has the same standby circuit. I have swapped the IC, opto-isolator, capacitors, and transformer. The non-working board has 1.6V where the 5V should be. Control voltage on pin 4 reads 1.1V. Should be .83V.

[mauroschilling]

Re: Sharp Power Supply Repair IC7905

I have the same problems on IC7905 TNY264PN and R7914 were blown too , I already checked all power resistor on the board, diodes and transistors , does somebody have diagrams of Delta DPS-485BP-1-A ?