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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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 Posted: Tue Jul 28, 2009 8:04 pm Post subject: Sony KD-32FS170 Chassis BA6 Dead |
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| not sure where to start on this one. I plug in the tv with the back off and I can hear a very faint click and then high pitch sound just for a second. then nothing. there is no lights, no sound. I have tested the main fuse on the board I think it is labeled F601. I also tested the fuseable resistor R646 and both test good |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Tue Jul 28, 2009 10:19 pm Post subject: |
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| Check out the Horizontal output transistor then switched mode power supply secondaries. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Tue Jul 28, 2009 10:47 pm Post subject: |
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| I think you are asking me to test Q501 which is a C3209 I have tested this and it test good. not sure where to test switched mode secondaries |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Jul 29, 2009 5:05 am Post subject: |
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Sounds like horizontal DRIVER transistor. H. out is on a heatsink. Remember to check labels on plug-in connectors.
SMPS secondary coils lead to diodes, far side of these diodes will have voltage on them (if SMPS working). Reference to "secondary" ground. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Wed Jul 29, 2009 10:34 am Post subject: |
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This TV had some kind of surge hit it. It was on, lighting hit close to the house and then the TV was off. Would not turn back on. I am not sure if this TV has some kind of protection for something like that. when I get home tonight I will test for voltages.
Yes you are right I tested the driver transistor and not the H out. I noticed that this hot has a damper diode. are those easy to test? and are they best tested out or in circuit? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Jul 29, 2009 2:35 pm Post subject: |
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Good rule is any part that tests suspiciously in circuit should be tested out of circuit.  |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Wed Jul 29, 2009 3:57 pm Post subject: |
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| do you know if there is a circuit in this TV that is supose to protect in the event of a surge? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Jul 29, 2009 5:05 pm Post subject: |
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Not that I know of.
Whenever there is a surge the regulator in a set is usually one of the first items to be taken out. Also can take out other parts in the power supply. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Wed Jul 29, 2009 8:31 pm Post subject: |
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can you give me some ideas of where to start. where to test and what voltage I should be getting?
ok so I tested 115vac is coming into the tv from there I tested d602 bridge and 115vac in and 162 vdc out. I tested while HOT was out Collector to Ground 45vdc 0 to B and E. tested T601 I have 115vac in and 115vac out and T602 has 67vac going in and several misc voltages coming out. I tested for 5v standby and that is missing? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Thu Jul 30, 2009 3:22 am Post subject: |
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Found this:
Kd36fs130 Ba6 : Dead No Blinks, Remote sensor shorted causing no 5v standby.  |
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