Question about Samsung HCM4215W 42" Rear Projection Television

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Red convergence is bad.

I can not get the red gun to align with either the auto or manual convergence modes. It will align in the center but towards the outside corners it is skewed and impossible to align. Any ideas? Thank you very much.

Posted by Bob Smith on

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  • 934 Answers

The red convergence amp has probably failed and both STK's should be replaced, along with two or more of the 3.9 ohm fusible resistors in the circuit. This is one of the more easily repairable units in the Samsung line because the convergence circuit is a separate board mounted up and away from the signal and deflection boards. But if you're not too tech savy don't tackle this yourself. Icz103 and Icz104 are both STK392-040. Check and possibly replace both FD101 and FD102 pico fuses (3.5 amp) and check all 3.9ohm/1w fusible resistors. At least two of these will be open when the corresponding STK failed. Replace the STK's with Samsung parts or genuine Sanyo STk's not their JApan knock-offs which are VERY hard to tell apart. And use a good heat sink compound when mounting the IC's for proper heat dissipation. If you have any questions let me know... Bill [email protected] PS: Many Techs have taken to mounting fans on this board to cool the IC's... Fans have proven to reduce operating temps by as much as 40 degrees and extending the IC's life limit by as much as 50%...

Posted on Jun 03, 2007

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The convergence chip is failing and is no longer capable of delivering the required current - you must replace it.
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Click on the following link :

http://www.riddledtv.com/repair/RCA.html. Go to the following section

RCA 52" D52W25 ITC222 rca_d52w25_small.jpg
(2) (3) (4)
(5) Stretched Image at top and bottom edge very distorted. Reheat all the surface mount solder points on the Small Signal Board. Then realign the set including convergence menu. To enter service mode: power off the set for 10 sec, then hold down Vol- and Ch- buttons for 10 sec. See this link: Alignment Procedure (pdf)


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Tv out of foucs

These procedures are from the owners manual, go into menu and then picture quality and then: Convergence The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’ images are precisely aligned, they create the color images you see on the screen. Over time, the picture can drift out of alignment (this is normal). If your picture seems fuzzy or has a yellow tint, using Convergence could correct this misalignment. Only one convergence is needed for all inputs, regardless of the signal format. Note: Make sure the TV has been on for at least 30 minutes (TV needs to warm up for best results) before starting Auto Converge or Red/Blue Centering. When you select the Convergence feature, a submenu appears with three options: Auto Converge Automatically aligns the projection lenses to self-correct color images. You’ll see flashing squares of color dance across the screen (this is normal). Note: After performing auto convergence, use the Blue Centering and Red Centering menus to fine tune convergence in the center of the screen, if necessary. Blue Centering Aligns the blue and green images to fine-tune the picture. Red Centering Aligns the red and green images to fine-tune the picture. Note: The ability to change channels is disabled when adjusting the convergence options. The TV must be tuned to a usable signal to converge the picture.
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Thought I had a convergence problem - red is still broke

KCOZI,

I dont think you have problem with Red Gun.
One of your Convergence IC is faulty with 2 RK series Resisitor(Low Value) in Convergence
Amp Borad.If you changed IC look for RK series Resistor (may be 3.9ohm/2.7ohm)


Dont forget to Rate!

Good Luck

Dals123
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Blue Projection Gun

It is not the gun ,but the convergence IC that needs replaced providing that you have went into the tv menu and selected convergence and manually adjusted the blue convergence.

Sincerely the Hammerman
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Red gun suddenly went wacko

Red Convergence IC bad.....small circuit board by itself up
above main boards..........replace both IC's for reliability...
STK392-040.........DO NOT USE GENERIC IC'S ! I use only
PANASONIC brand = no re-calls !!
Re-align when repair complete............T.
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Red convergence is bad.

Hi, you need to change the convergence ICs , STKs: and some resistors,low values; , after changing them, you will have to go into the service mode, to do some adjustments.that's it.
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Center adjust on Red gun is not aligning with B&G vert.

frist set blue and green than set red itwill shoew yu single chakall will be focous in single line than than gun will be allign horizontal if it will correct if itisnot comming than cathode problem.
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http://servicemanuals.vstore.ca/
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It sounds to me like the convergence amps themselves have failed. Ic7001 and Ic7002, both are STK392-110 Sanyo built Ic's and not an expensive job for a qualified shop. When shopping around for a shop to repair it ask what they charge for replacement of the convergence amps in this unit. And take the unit to them to save pickup and delivery charges...
Have a great day!
Bill
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