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train123
Joined: 26 Jan 2010
Posts: 88
Location: Canada
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 Posted: Thu Oct 06, 2011 8:37 pm Post subject: Sony 32" LCD, KLV-32M1 power supply has no standby volt |
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I'm having trouble isolating the problem to this set.
The standby 5V isn't there and the voltages around the STR-A6169 controller IC wasn't right so I changed it out and it still doesn't have standby +5. Is there a common problem with these and are any ideas as to what to look at next? |
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Thu Oct 06, 2011 11:08 pm Post subject: |
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| train123 wrote: | | the voltages around the STR-A6169 controller IC wasn't right |
Can you elaborate? Pins 5, 7 & 8 all above 250v; pin 2 has 21.5v?
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train123
Joined: 26 Jan 2010
Posts: 88
Location: Canada
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| Posted: Sun Oct 09, 2011 3:15 pm Post subject: |
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pins 5, 7, & 8 all seem to be at 321 volts and pin 2 has 12.3V. I looked at D663 which seems to be the supply for pin 2 and it is at 12.3 as well.
D664 is at zero and when I remove the fused resistor R675, D664 stays at zero. Diode check of both D663 & D664 using my multimeter gives .5 forward bias and infinite reverse bias so both seem okay. |
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Sun Oct 09, 2011 6:30 pm Post subject: |
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Primary of T661 is pins 4/6.
What's going on at IC621/Q661/Q662? MCZ3001UB high-failure part on other Sony's.
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minnie
Joined: 18 Aug 2005
Posts: 2880
Location: Hell
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| Posted: Sun Oct 09, 2011 7:22 pm Post subject: |
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| Check D664 to see if it's shorted. |
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train123
Joined: 26 Jan 2010
Posts: 88
Location: Canada
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| Posted: Tue Oct 11, 2011 3:17 am Post subject: |
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D663 and D664 check fine on a diode checker and I even swapped them to see what happens, no change. R667 & R668 are also reading 10 ohms like they are supposed to so I don't know why I'm not getting 20v off that diode. Isn't T661 pin 2 a secondary side of the transformer and that is all fired from IC661 to T661 pin 4?
jt1957 asked about IC621 and I get:
1= 3.5v
2= 1.2v
3= .2v
5= 0v
12= 0v
14= 0v
15= 0v
16= 0v
17= 0.2v
20= 0v
21= 140v
22= 156v
23= 156v |
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