Hi folks, i have a sony home theater here thats with no power issue for a very long time, probably due to lightning strike. I have sorted out primary and fuse no longer blows out. This unit has 2 STR IC, one is STRF6168 and STRV153. Both has been replaced, electrolytic caps has been replaced, a few smd diodes replaced and resistors replaced. The problem now is, on VCC of STRV153, voltage are fluctuating between 12v to 15v up and down. Theres no voltages at all on any of the output pins. I have checked all the smd components, all seems to be reading accurately. But i know there IS something thats preventing the STRF6168 to start up. VCC on STRF6168 is 2v. Any kind souls that has repaired this unit before care to shed some light?
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Sony Hcd-Fxg9k No Power
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Re: Sony Hcd-Fxg9k No Power
Anyone? Im going bonkers with this power supply When i remove the zener diode D924 which is 24v, voltage no longer fluctuating. Its stable at 13v. Am i missing something here?
Or i have changed the wrong zener diodes on D923 (10V), D924 (24V), D925 (5.1V) and D926 (10V)?? I followed the voltage rating according to service manual. I also noticed certain components thats on the service manual doesnt exist on the board, so i assume this board being used on several models. So i suspect the ZD could be wrong. Even after removing that diode, theres no signs of any voltages on the output.Last edited by DjKrish; 09-22-2021, 01:14 AM.
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Re: Sony Hcd-Fxg9k No Power
Originally posted by DjKrish View PostAnyone? Im going bonkers with this power supply When i remove the zener diode D924 which is 24v, voltage no longer fluctuating. Its stable at 13v. Am i missing something here?
Or i have changed the wrong zener diodes on D923 (10V), D924 (24V), D925 (5.1V) and D926 (10V)?? I followed the voltage rating according to service manual. I also noticed certain components thats on the service manual doesnt exist on the board, so i assume this board being used on several models. So i suspect the ZD could be wrong. Even after removing that diode, theres no signs of any voltages on the output.
Why did you replace the zener diodes? where they shorted? or did you just guess they were bad?
Have you checked the caps such as C922, C924
Do you have any of the 4 secondary voltages on T902?
If IC921 was bad, is R927 1Ω ok?Last edited by R_J; 09-23-2021, 10:08 PM.
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Re: Sony Hcd-Fxg9k No Power
Originally posted by R_J View PostWhich voltage is now stable? the output 13.3 on the secondary? or the voltage on Q921?
Why did you replace the zener diodes? where they shorted? or did you just guess they were bad?
Have you checked the caps such as C922, C924
Do you have any of the 4 secondary voltages on T902?
If IC921 was bad, is R927 1Ω ok?
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Re: Sony Hcd-Fxg9k No Power
Originally posted by R_J View PostWhich voltage is now stable? the output 13.3 on the secondary? or the voltage on Q921?
Why did you replace the zener diodes? where they shorted? or did you just guess they were bad?
Have you checked the caps such as C922, C924
Do you have any of the 4 secondary voltages on T902?
If IC921 was bad, is R927 1Ω ok?Last edited by DjKrish; 09-24-2021, 02:09 AM.
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