Sanyo TV DS19204, ch 19204-01 Vertical Deflection Problem

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- Brad
  
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posted
18 years ago

Wed, Aug 10, 2005 1:02 PM

Hi,

Sanyo 19" TV model DS19204, ch 19204-01 mfg 11/04

I have this TV in my shop with loss of vertical deflection (TV goes off shortly after turn on). I have no SM or pin out information (searched web) about IC501, LA78040N. B+ (24V) is present at pin 2 when TV is turned on. Pin 4 is ground. I saw an abnormal signal on pins 3, 5, and 6 which causes a small deflection as a light shading above and below the center horizontal line (TV is on long enough for this to appear). I tested components around IC501 and found no defective part. I suspect that the source of the vertical signal (which is abnormal) that drives IC501might be the problem?

Thanks in advance, Brad

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- electricitym
  
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posted
18 years ago

Wed, Aug 10, 2005 3:25 PM

Brad: It sounds to me that you should replace the LA7804 chip. Also check the surrounding circuitry for leaky or high esr electrolytics (you must check them with an ESR meter... or just replace all of them... maybe a half dozen or so) and check for shorted or open diodes, open resistors and faulty solder connections near the chip. electricitym

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Brad wrote:

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