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Convergence Problems
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Graham24



Joined: 28 Apr 2007
Posts: 7

PostPosted: Sat Apr 28, 2007 8:46 pm    Post subject: Convergence Problems Reply with quote

have a Samsung HCP4752W Rear Projection TV (Chasis P59A) The colors are blurred and I have two semi circles at the top and bottom of the screen, so reading all of the other posts I beleive I have a convergence problem. I have replaced the STKs but the problem remained. Has anyone got any ideas?
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sidyal



Joined: 27 Apr 2007
Posts: 1
Location: UK

PostPosted: Sun Apr 29, 2007 9:52 am    Post subject: Reply with quote

Check the 3.9ohm and 150ohm resistors around the STKs. These values need to be spot on. You'll have to disconnect one side to measure as they are in parallel pairs.
Also there is a fusible link feeding each stk. Check them for open circuit.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun Apr 29, 2007 7:33 pm    Post subject: Reply with quote

Also check the 3.5 amp pico fuses under the heat sinks.
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Graham24



Joined: 28 Apr 2007
Posts: 7

PostPosted: Wed May 02, 2007 4:13 am    Post subject: convergence problems Reply with quote

Thanks for the info - I have found the 3.9 ohm resistors but I am unable to locate the pico fuses could you explain what they look like?
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cory
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PostPosted: Fri May 04, 2007 3:05 am    Post subject: Reply with quote

usually under heatsincs,hard to see.green in color.
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Graham24



Joined: 28 Apr 2007
Posts: 7

PostPosted: Fri May 04, 2007 8:15 pm    Post subject: Reply with quote

I founf ther pico fuses thanks - they a green in color, they both checked good. I did find two 3.9 Ohm resistors bad RZ142 and RZ143 any ideas where I can get suitable replacements? Thanks for the help so far.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Fri May 04, 2007 9:02 pm    Post subject: Reply with quote

Any electronics supplier. What country?
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Graham24



Joined: 28 Apr 2007
Posts: 7

PostPosted: Sun May 06, 2007 12:14 am    Post subject: Reply with quote

I replaced the resistors and the convergence is fine now - thanks for the help. But I now have a line right down the middle of the screen anyone got an ideas o this one?
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Graham24



Joined: 28 Apr 2007
Posts: 7

PostPosted: Sun May 06, 2007 8:04 pm    Post subject: Reply with quote

The line on a blue screen looks black and runs vertical in the centre of the screen. When a TV Channel is selected the line turns into red green and blue and looks like the screen has been drawn on using whiteboard markers/pens. There is also a green V-shape to the left of the line. Could it be the replacement 3.9 ohm resitors or ICs? There is nothing on the rear of the screen, lens or mirror so I am really stuck now has anyone heard of this before or got any ideas on what is causing this?
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun May 06, 2007 8:42 pm    Post subject: Reply with quote

Can you post a picture?
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