Samsung TV convergence problems

Hello everyone:

I have a samsung projection tv model no: HCN4727W

The convergence is off as it does not let me adjust blue, and while red adjusts fine, it is warped at the top and bottom. I pulled the convergence board, and it appears that the two IC units have been replaced at least once in the TV's lifetime (I just got the tv and have no idea of its prior history). Also, the repairman soldered pins

1,2, and 3 of both IC units in line with a resistor (or maybe a diode I'm not sure), and then connected the resistor to the -20v terminal on the board. I'm not sure why this modification would be necessary, as it appears the IC chips are OEM (they're both STK392-040). Anyways, I was thinking of just replacing the entire unit (board and all) and seeing what happens. Good or bad idea?

formatting link

Mike

Reply to
97tjMike
Loading thread data ...

Probably a good idea especially if you don't know the difference between a resistor and a diode.

Reply to
Meat Plow

ah well i know their difference functionality wise, just not appearance wise. i'd call it a resistor except it has a glossy coating common to diodes

Reply to
97tjMike

I believe the Mr. Plow was not trying to be lightly humorous, but was being sarcastic at your expense.

Reply to
William Sommerwerck

I have not worked on that model myself. But, most of the time the failures are the driver IC's, bias resistors and caps. If available, some of the service techs will replace the complete convergence board.

Considering the age of the set, and the fact that it uses tube technology for the display, maybe you should consider something up to date and dependable rather than chase the faults in this one.

--

JANA _____

I have a samsung projection tv model no: HCN4727W

The convergence is off as it does not let me adjust blue, and while red adjusts fine, it is warped at the top and bottom. I pulled the convergence board, and it appears that the two IC units have been replaced at least once in the TV's lifetime (I just got the tv and have no idea of its prior history). Also, the repairman soldered pins

1,2, and 3 of both IC units in line with a resistor (or maybe a diode I'm not sure), and then connected the resistor to the -20v terminal on the board. I'm not sure why this modification would be necessary, as it appears the IC chips are OEM (they're both STK392-040). Anyways, I was thinking of just replacing the entire unit (board and all) and seeing what happens. Good or bad idea?

formatting link

Mike

Reply to
JANA

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.