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Sony KD-32FS170 Chassis BA6 Dead   Goto page 1, 2, 3, 4, 5, 6  Next  
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ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Tue Jul 28, 2009 8:04 pm    Post subject: Sony KD-32FS170 Chassis BA6 Dead Reply with quote

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

PostPosted: Tue Jul 28, 2009 10:19 pm    Post subject: Reply with quote

Check out the Horizontal output transistor then switched mode power supply secondaries.
ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Tue Jul 28, 2009 10:47 pm    Post subject: Reply with quote

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
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Wed Jul 29, 2009 5:05 am    Post subject: Reply with quote

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.
ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Wed Jul 29, 2009 10:34 am    Post subject: Reply with quote

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

PostPosted: Wed Jul 29, 2009 2:35 pm    Post subject: Reply with quote

Good rule is any part that tests suspiciously in circuit should be tested out of circuit. Wink
ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Wed Jul 29, 2009 3:57 pm    Post subject: Reply with quote

do you know if there is a circuit in this TV that is supose to protect in the event of a surge?
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Wed Jul 29, 2009 5:05 pm    Post subject: Reply with quote

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.
ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Wed Jul 29, 2009 8:31 pm    Post subject: Reply with quote

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?
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Thu Jul 30, 2009 3:22 am    Post subject: Reply with quote

Found this:
Kd36fs130 Ba6 : Dead No Blinks, Remote sensor shorted causing no 5v standby. Idea
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