Question about Sony BRAVIA KDL-52W4100 52 in. LCD HDTV

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Hello, I have a Sony KDL-52W4100 with retrace lines on the bottom 1/4 of the panel. Looks like a vertical problem from the direct view sets. Any idea if it is the t-con or main board? Thanks.

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  • Bob Apr 29, 2010

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Hi,
If lines at 1/4 of bottom part of screen are across the screen then it could be T-Con or LCD Panel problem and if lines stop in halfway then its confirmed LCD panel problem.
Below exploded view (taken from service manual) shows T-Con board location in this tv.
Hope this info will help you.
Let me know if you have additional question.
Thanks.

Hello, I have a Sony - 9b6938f.jpg

Posted on Apr 29, 2010

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http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
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There are many reasons for this fault. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
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1 Answer

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Most probably the vertical deflection amplifier is failing. The most common part that fails is the vertical output transistor.
The set is too old to find documentation on part numbers and descriptions. Probably the part is no longer available and you will need the assistance of someone who can help you find an equivalent transistor that will do the job.
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Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

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