Re: Hi Pravin,thanks for the reply.where abouts in the circuit would i find the capacitors in the Vertical stages.And I have read before opening up a tv casing is a bit dangerous due to high voltage. is it really that dangerous even if i haven't connected the power or to get to the circuit board would i have to risk any danger?please..i really want to do this just need some help where exactly to find the capacitors on the circuit board.

Denotes the absence of vertical sweep. Check all the solder terminals at the vertical output IC for any loose soldering. If this IC do not get its supply voltage, or, if it is faulty, or, any connection tracks to vertical deflection yoke is open, this kind of fault can occur. In this case, as there is horizontal line on the screen, TDA1930 is working. So, troubleshooting should be concentrated to its vertical scan output stage circuits. Check for any bad capacitors too. There will be 5 to 9 electrolytic capacitors will be there, related to vertical scan circuit. Replace all of them once, not by individual. If you wish to get more details, check the site linked here. Pull up older posts.

Hi,

Often culprit would be the vertical IC. The are a fe instances that it could just be a resistor that has opened or increased its resistance.

Basic tools (DVM, soldering iron hand tools) should be enough. Perhaps you would not even need a service manual but a schematic would help.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Hi
Please check the voltage in Vcc pin of the vertical output IC. If it is higher than apropriate voltage, replace the filter capacitor in the DC supply line of the IC. This voltage comes from one of flyback transformer windings so you should look for its rectifier diode and capacitor near the transformer. If this voltage is correct, replace the electrolitic capacitors in the vertical circuit output and some 100/220nF poliester capacitors near the linearity pin of the IC.
Sully

change the run capacitor on the motor,its getting weak,there may also be another capacitor for the start circuit,replace them both

thir is somecondensers on the tv needs to be changed especialy on pwer supply and vertical circuit it is easy fault but needs technication,,,but first be sure thir is no floresent lamp common with the same supply of the set

Hello dan82810,

The picture tube or CRT is not the problem, and yes this set is fixable. What has happened is that the vertical deflection circuit has malfunctioned. More precisely the vertical coupling capacitor has malfunctioned (The pooping sound was the capacitor exploding).

Open up your TV (take the back off and unplug the set), and look for the damaged capacitor, it will look puffy or if it has exploded.

To fix this problem you will need the schematic diagram for the TV (can be found at www.servicemanuals.net). Then you will need a multimeter to measure the DC voltages on the vertical output circuit, and finally an oscilloscope to measure the waveforms at the vertical output circuit and the input to the vertical windings of the deflection yoke transformer.

Now what you should basically find is a sawtooth wave at 60Hz which is the drive for the yoke transformer. However since the coupling capacitor is bad you will have the wave at the output of the vertical output stage, but not at the input of the yoke transformer. Use the schematic to find the value of the capacitor that has malfunctioned.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

buy a new telly

If your seeing vertical line across the screen you need to check the components in the vertical stage as well as the vertical IC could be bad, or the yoke could open.
Also check if any voltage reaching the vertical stage.

Good luck.

Was this help full.

1 it is due to electrolytic capacitor defective in vrtical output stage. 2 loose contact in vertical. 3 fault due to feedback ckt in v/stage. as per schematic diagram is concern check www.serviceinfo.com

This problem is generally due to aged Electrolytic capacitors in the Vertical section. Again, to save time, I invariably replace all the 8-10 El caps in this stage at one go. solves the problem, saves time, and also protects the customer from bringing in the machine again in another 2-3 months, for another bad capacitor problem.