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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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 Posted: Sun May 17, 2009 12:01 am Post subject: Sony KV-32S40 Chassis AA-2D FIXED |
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I have a sony kv-32s40 tv chassis aa-d2 the led just blinks constant no patern. I pulled the fusable resister 0.1 ohm and it is open. I think I am going to repalce the IC601 which is a mx0841 not sure how to test but with the fuse blown I figure that part should be bad as well. the tv was working about a week ago and then just turned off.
question. Is there an easy way to test to see if the hot is good?
Is there a list of parts that once the fusable resister is blown you would replace?
thanks.
Last edited by ntehicks on Sun Jul 05, 2009 4:42 pm; edited 1 time in total |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Sun May 17, 2009 8:22 am Post subject: |
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Test IC601 out of circuit (two transistors side-by-side inside the same package) with a DVM - preferable on diode test setting (Base to emitter & Base to collector will read infinity with the test leads one way and give a reading with the test leads reversed - collector to emitter should read infinity with either positioning of the leads. With same meter, Horizontal Output transistor (in circuit) should only have one very low reading (base to emitter) - ALL other junctions as above (unless HOT has damper diodecollector to emitter).
Also resolder horizontal driver transformer pins. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Sun May 24, 2009 8:16 pm Post subject: Parts parts parts |
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| I replaced IC601 tested and the old one was bad. once I installed the new IC and replaced the fuseable resister. I also tested the hot and just happened to have ordered that as well. the old one was open. I replaced C613 2200pf 500v and a 50v 22uf. Plugged in the tv and tested. it blew the ic601 and the fuse. I then tested and one of the bridge rectifiers on the board was bad. I am not sure if now I should replace the ic601 and try again or just toss the tv. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Sun May 24, 2009 10:10 pm Post subject: |
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I don't see it mentioned in your latest post.
Did you:
| Quote: | | Also resolder horizontal driver transformer pins. |
Which ("one of the bridge rectifiers") is involved? If it's the one for main B plus (D602), why would IC601 blow again?
Before trying plugged in again, test for shorts across main B plus filter capacitors (C607/C608) and from collector of HOT to Ground.
Last edited by JTS1957 on Sun May 31, 2009 3:18 am; edited 1 time in total |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Mon May 25, 2009 2:09 pm Post subject: |
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| Yes, are you talking about the FlyBack Transformer. I have looked and resoldered all transformers on both powersupply and main board. I will test hot again and see if it blew. do you know which cap I would check. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Mon May 25, 2009 2:25 pm Post subject: |
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The Horizontal Drive transformer is connected to the horizontal output transistor's "BASE" lead - The horizontal output transformer (Flyback) is connected to the horizontal output transistor's "COLLECTOR" lead. (Follow the foils/leads/traces)
Cap is connected across (in parallel) the "-" and "+" of the Bridge Rectifier. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Mon May 25, 2009 11:18 pm Post subject: |
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| I went and found the Horizontal Drive Transformer and resoldered all of its connections. looked at H-Drive transistor it looked like it got warm. it tested bad. so I replaced that as well as three capacitors that all tested bad. I am going to order one more kit for the power supply. is there anything I should test before I turn this on again? thanks so much for your help. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Mon May 25, 2009 11:30 pm Post subject: |
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| JTS1957 wrote: | I don't see it mentioned in your latest post.
Did you:
| Quote: | | Also resolder horizontal driver transformer pins. |
Which ("one of the bridge rectifiers") is involved? If it's the one for main B plus, why would IC601 blow again?
Before trying plugged in again, test for shorts across main B plus filter capacitor and from collector of HOT to Ground. |
Also found these: D642 (D10SC4M), D649, D650
Repair Tips _ Sony : Kv-32s40 Aa-2d : Repeat Failure Of Mx0841 And R607
it came in with ic601 mx0841 and r607 .10ohm/1/2w blown. Replaced and blew them again.
this time I checked and replaced ic1701-tda6108jf video out and R553 .47/1/4w near flyback
along with ic601,r607. set is working great. art
Less common: Bad Flyback, CRT shorted. |
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ntehicks
Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah
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| Posted: Fri May 29, 2009 10:15 pm Post subject: |
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I have replaced the following parts.
IC601 MX0841
R607 .1 OHM 1/2 WATT
C613 2200PF 500V
IC1701 TDA6108JF
Q502 2SC5148 Horizontal output Transistor
T501 Horizontal Drive Transformer
D649 Diode
D650 Diode
2sc3209lk Horizontal drive Transistor
Now when I turn on the tv I still get the red led blinking constant no pattern. and just sound. Is there any other parts I should look at. seems like there is no high voltage. I did notice a switch on the main board. I might have bumped this switch, but not sure if this could cause this.
thanks for the help. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Fri May 29, 2009 10:24 pm Post subject: |
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Well at least you're making progress.
Switch is probably for "centering."
Recheck soldering on IC1701 and make sure it's getting B-Plus (200-ish volts) on pin 6.
regarding: | ntehicks wrote: | | red led blinking constant |
Have you read yet?: http://www.techlore.com/article/15444/Understanding-Sony-Television-Blinking-Codes/
You may have a CRT that's very weak in emission (Previous mention CRT possibly "shorted," now proven NOT the case).
Picture may flash on for a moment and then off just by letting the set play awhile. Could also try SLOWLY rotating the Screen control down and up about 45 degrees of rotation - Mark a reference line so you can return it to the original starting point. If picture comes on at any point, it's proof enough for me.
Last edited by JTS1957 on Sun May 31, 2009 5:37 pm; edited 1 time in total |
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