Model: Dell E173fpf
Fault: No power led comes on and nothing is displayed on the screen at all.
Observations: constant ticking noise heard from T850 and I get a constant 131v from the primary capacitor (using mains earthing point)
I have changed cap C506 (4.7uf 16v) as the ESR was slightly high - 2.1
I have also changed D854 (SRF 10-10) as I had seen on another post that this part was faulty and before I replaced it the solder points looked slightly different compared to the rest, maybe due to it running hot?.
I have checked the board and cannot see any burn mark at all. I have checked the larger resisters and these are fine. D850 which I think is known as a bridge rectifier tested fine.
Questions: If I put my negative lead only from the DMM on the primary negative I get some fluctuations in voltage normally between 0.5 to 6v's so what could I do to get an accurate reading from the pins on U850?
Could someone please confirm what Q850 does and how I might test this component?
Many thanks
Ps: I am aware that there is some excess flux which I didn't wipe off prior to taking the photo's.
Fault: No power led comes on and nothing is displayed on the screen at all.
Observations: constant ticking noise heard from T850 and I get a constant 131v from the primary capacitor (using mains earthing point)
I have changed cap C506 (4.7uf 16v) as the ESR was slightly high - 2.1
I have also changed D854 (SRF 10-10) as I had seen on another post that this part was faulty and before I replaced it the solder points looked slightly different compared to the rest, maybe due to it running hot?.
I have checked the board and cannot see any burn mark at all. I have checked the larger resisters and these are fine. D850 which I think is known as a bridge rectifier tested fine.
Questions: If I put my negative lead only from the DMM on the primary negative I get some fluctuations in voltage normally between 0.5 to 6v's so what could I do to get an accurate reading from the pins on U850?
Could someone please confirm what Q850 does and how I might test this component?
Many thanks
Ps: I am aware that there is some excess flux which I didn't wipe off prior to taking the photo's.
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