Question about Samsung HCM4215W 42" Rear Projection Television

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HCM4215W convergence issue

I changed the sub PCB red and the main convergence board last fall and all has been GREAT ever since.
Now if i try to enter Mute+182 the menu does not show up and my convergence is all screwed up again. Also the power DOWN tones are gone , but stil get the 6 or so ascending power up tones.
Do you think i need yet another main convergence board?
if so i may still be under warranty.
any help would be welcome, and you can also email me directly at Duncyn@tmail.com
thanks alot in advance.
Josh

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Mute 183 power.

You may have done alignment previously in service mode and not initialized or saved correctly. add/erase saves

The test for convergence ICs working is if the V and H can be adjusted for all colors in different picture quadrants. The adjustment may be so far off that it looks broken.

There may be low ohm resistors that have increased in value. Some Samsung chassis use low ohm resistors that have built in Zener diodes for stabilizing the voltage drop across the resistor. Replacing with ordinary resistors (as the schematic shows) may cause poor convergence that can be adjusted after warming up, but always varies noticeably when going from cold to hot.

Using the correct part number from Samsung will ensure that the right part is in place.

When 1 or 2 ICs fail with no resistor damage, only small or no adjustment is necessary (if the replacement ICs are well made and imitate the original). When resistors burn and are replaced, adjustment is required more often than not.

Call someone that has aligned and repaired numerous Samsung RPTVs and your problems will be over.

There is a list of repair techs on the Home Page. Projection Televisions

If you are in Calgary, call me.

easyab.

Posted on Aug 24, 2008

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