Have no service manual--but suspect convergence output amps--now power issue
The problem began with a rolling picture broken by several horizontal bars for half an hour and then the roll would cease and as long as the unit was left on, the picture would remain steady. Suspect vertical control circuit and convergence output amplifier STK's. No bad solder joints or broken trace are apparent. wiggle and tap tests yield no changes. Signal from pin 7 on IC802 is ringing with all sorts of overlapping signals. This had me believing the problem was a bad solder joint or crack in the trace...possibly bad amp. I wanted to test using manual circuit adjustment however the unit would not permit entry in to Service Adjustment Mode despite setting Direct key entry mode to "On". Since beginning to troubleshoot the signal and main boards, the unit suddenly ceased to complete powering on. Have STBY 12V on board and the fuses are intact....130V and 18V + HV is present for an instant and it would seem a protection circuit kills the process before it can complete.
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.
Less power output from the internal SMPS; usually 110v, may less. Horizontal output capacitor may leaky. Horizontal output transistor fault may occur. In rare cases deflection yoke assembley fault.
If the picture is stamped size; suspect the power supply. If the picture is less in width, suspect the above said capacitor, and the lenearity coil fitted on the main board.
It seems the solder is broken in Vertical Convergence Amplifiers or it is damage internally. This model has 2 Conv. Amps: 1 for Horizontal (Red, Green and Blue) and 1 for Vertical Convergence output (Red, Green and Blue), if the convergence does curve at the top and bottom, it is because Vertical Converegence output is no good. The Conv. Amp. costs around 20 dlls. Thats why you can not fix it with the Menu option. Good luck!
It sounds like an Intergrated Circuit (IC) has fried. Even on a good day, this is not something you can attack at home. As a tech (and as an owner of that model samsung), I'd need a map & tools to know what's going on. Your best bet in this situation and let them recommend an authorized service center in your area. but this is a rather serious problem...
This TV could have one of several problems including but not limited to; convergence IC's,bad capacitors, shorted horizontal output transistor. Call a good TV Tech. Check with the BBB before you decide on one.
By the red being "off" I suspect you have a convergence problem and adjusting will bnot likely fix the problem. The convergence amps need to be replaced but if you email me I can send you the servoce manual... Just provide me with enough info in your mail, model number, because I get nearly 3000 emails a day and I won't likely remember what manual you're looking for...
You may a vertical problem but I think it's not the vertical output amp. The problem should be in the voltages feed the vertical circuit. I have had cocern many times, so try this first: 1. VERTICAL ROLLING, VERTICAL BLANKING BAR LOCKING IN THE MIDDLE OF THE PICTURE, ALSO MAY HAVE HORIZONTAL PULLING OR TEARING. CHECK C2C52 10 UFD @ 50 V OFF THE BASE OF Q2C51 ON THE SIGNAL PCB. 2. CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01 AND IC2P01 PART # 270P466020 (9-VOLT REGULATOR). BOTH ARE ON THE SIGNAL PCB.
Replace these caps no matter how they check.
2. Shuts down; may be intermittent, self-diagnosis ERROR 23 or 24. Check solder connections at connector "DY" on the yokes. Or/and check C411 2200 UFD 35V AND C412 10UFD 50V, both located on the main PCB.
3. Service adjustment codes:
a. Option menu; press MENU 1270
b. Service menu; press MENU 1257.
now only visible in a thin horizontal line.
first of all you reduce brightness to monimum.
it just to protect your tv from crt demage.
your problem is in horizontal output section as you have mentioned that week or so ago the right and left bottom edges of the picture began to move in like a sideways triangle filled with black so this sympton is due to hor. section problem.
your flyback transformer or horizontal output might be defective.
but remember check for power supply is ok from
hope this will help.
Probably the red convergence output IC has failed. The chip is basically a stereo amplifier that serves as a horizontal amplifier and a vertical amplifier. I suspect the vertical part has failed and is not uncommon. Should be generic STK392-150's or maybe STK392-110/120 I believe. By the way when the line moves up and down that means the vertical is working when it moves side to side the horizontal is working.