Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Vertical black line

4363 projection tv samsung had convergence problem replaced 2 stk ics and 4 resistors and had a black faded line in center of screen and machine back to normal but still have line everything seems clean thanx

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  • hotrodder5 Aug 18, 2007

    no its 3" off top and bottom and wider in some parts than others colour pretty well same .could it be a line in the phosforand if so what do i do thanx

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Does this verticl line go all the way form top to bottom or is it about 5-7 in long in the center of the screen and does it some times change in color with the picture.

Posted on Aug 18, 2007

  • g w Aug 18, 2007

    if its image burn you require new crt's ,contact samsung to see if they wil cover the fault ,they konw about this already/g

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JVC Television


1024x768 Normal 0 Convergence


When A REAR PROJECTION TV has coloured outlines or a 3D image the Convergence Circuits most likely need attention.

Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines.

This is the most common fault in all makes of rear projection TVs.

Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.

Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.

It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip may fail again.

This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.

Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.

If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab

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1 Answer

Ok, so I Replaced stk-392-110 (2) and......


Check the resistors in the red convergence circuit right next to the Ics you will need to lift one side of the resistor out of circuit to acurately check them but usually one or two resistors will be opened when the ICs go out

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