Hi! I have a Sony home theater system that won't power up, model DAV-HDX265.
It contains a power supply board 07dav-power-13-mp (1-872-105-13). I've checked a few things, but not sure where to go from here. Attached some pics, if any zoomed-in shots would help just let me know.
- the voltage from CN904 marked 31.5vdc measures 0v
- the voltages from CN906 don't make a lot of sense to me, but I'm not sure if I should be measuring from chassis gnd or "D-GND" on CN907...
- I checked all electrolytic caps with an ESR meter, and nothing looks suspect; no caps bulging either
- I checked the diodes and transistors, as well as IC921 for shorts but don't notice any
- fuses/resistors F901, LF902, R912, R913, FR930, R903, R904, R927 all seem fine
- for the heck of it I replaced C924 & C926 (I hate Lelon caps), but no change
- I hear a faint, high-pitched squeal when the board is plugged in, not sure if that necessarily means anything
I think I found the schematic here:
https://www.manualslib.com/manual/59...page=64#manual
Any help or advice on where to go from here would be greatly appreciated, thanks!
-Chris
It contains a power supply board 07dav-power-13-mp (1-872-105-13). I've checked a few things, but not sure where to go from here. Attached some pics, if any zoomed-in shots would help just let me know.
- the voltage from CN904 marked 31.5vdc measures 0v
- the voltages from CN906 don't make a lot of sense to me, but I'm not sure if I should be measuring from chassis gnd or "D-GND" on CN907...
- I checked all electrolytic caps with an ESR meter, and nothing looks suspect; no caps bulging either
- I checked the diodes and transistors, as well as IC921 for shorts but don't notice any
- fuses/resistors F901, LF902, R912, R913, FR930, R903, R904, R927 all seem fine
- for the heck of it I replaced C924 & C926 (I hate Lelon caps), but no change
- I hear a faint, high-pitched squeal when the board is plugged in, not sure if that necessarily means anything
I think I found the schematic here:
https://www.manualslib.com/manual/59...page=64#manual
Any help or advice on where to go from here would be greatly appreciated, thanks!
-Chris
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