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Partial horizontal collapse. Nu-tec Model NTT-829A

I have replaced IC Tda3654. I have replaced all electrolytic capacitors in high voltage circuitry and som of the non polarized cap's. High wattage resistor 436 on pc board measures 4.6k ohms but cannot determine what the actual resistance is supposed to be as the colors are totally discolored due to the heat the resistor dissapates. Do you know where I can get a circuit diagram or do you have any ideas to rectify problem?

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If you have retrace lines I would recheck all caps around the vertical IC 100@16 is the most common 47@35 and 220@35

Posted on May 30, 2008

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No power out


You have no power because you didn't fix 2 or 3 electrolytic capacitors when you saw warning signs. Warning signs start as horizontal lines every half inch or so. Black bars on the top and bottom, then collapsing to a horizontal line, then complete failure.
You will need a horizontal output transistor, the aforementioned electrolytic capacitors, a voltage rectifier, possibly a high voltage coil called a flyback transformer, wire wound resistor, maybe a low resistance resistor, maybe a high voltage capacitor. In some tvs you need an EPROM ic. I hope you can find someone with the knowledge and expertise these days when the modern throwaway society put almost all electronic repair shops out of business. It may cost about $300 - $400 to get repaired or you can get a modern flat-screen tv for $800 - $1,000 and reinvest that money.

Nov 27, 2013 | Standard (CRT) Televisions

1 Answer

Hi there, do you have the schematics for the Panasonic CT-27sf37b. This TV won't power up but making a high pitch sound near the thermistor area. Thanks.


Hi Richard,


First of all thank you for contacting Fixya.com regarding your TV problem.

You have mentioned that you can hear a high pitch near the thermistor area and the TV won't power up. I've saw also in another link that you already replaced the thermistor but the symptoms still persist. You stated that the thermister heats up, that is normal and not an issue in this kind of symptoms. You can power up the unit even without the thermistor in the board and check if the high pitch will gone or not. But I've suspected that the symptoms will remain the same because the pitch came from the chopper transformer.

I've encountered this kind of symptoms not only on panasonic CRT TV's but almost in all brands. And the major caused of fault is the faulty electrolytic capacitor in the Voltage regulator IC. Your unit used STRF6524 (mounted on the aluminum heat sink) as voltage regulator IC and it has an electrolytic capacitor on its circuitry. I would advice you to replaced it to resolve the issue. The largest electrolytic capacitor is not the suspect here (don't replaced it).

Also check for bad solder joints around the regulator IC. Cracked, cold, dried solder can produced that kind of symptoms. It is hard to spot, you must used magnifying glass and work in the brightest area or much better to re-solder the suspected bad solder joints.

I have various of Panasonic schematic diagram but most of them is a LCD and Plasma TV. I don't have this model no. but please check the chassis no. of your unit and I will try again to find it on my supplier to give it to you for free as much as possible because I've saw it HERE but I don't think the price is reasonable.

Please let me know if you need further assistance.

Again, thank you and have a nice day!

Kind Regards,

Jdvillanueva

Dec 07, 2011 | Standard (CRT) Televisions

2 Answers

Tv on appears black screen with a bright horizonal line in the middle sometimes with voice


You will have to resolder the vertical IC and in most cases replace any capacitor that is near and next to the vertical IC. There may be three capacitors that will be replaced, And while you are in the process of reworking the board inspect for any and all grounds that may need resoldered. You will have to look very close to find these. And you should search the deflection side of the board for two capacitors that have a 160 volt to 250 volts at 1MF, or 2.2 mf or 4.7Mf. By now these little guys are weak and need replaced. Thanks for asking and show a few hands of support!

Jan 27, 2011 | Panasonic CT-32G23 32" TV

2 Answers

Horizontal lines are at the top of the screen (First 3-4 inches) rest of the screen looks fine


This seems to be a fault in the vertical blanking circuit. It's very common to have open or out of value electrolytic caps that make this problem.
I could guide you in finding this cap if I had the schematic for this TV, but I don't.

Dec 10, 2010 | Panasonic CT-27SL15 27" TV

2 Answers

TV has a line across middle from left to right


It depends what part was damaged in Horizontal section. Here in Philippines labor costs for this size of TV is ranging from $50 to $150.

Feb 27, 2010 | Standard (CRT) Televisions

2 Answers

My TV picture has collapsed to a single horizontal line


If it is an standar analog tv, I'm sorry to tell you but, is time to get a new one.

Dec 05, 2009 | Panasonic Standard (CRT) Televisions

1 Answer

TDA3653 keeps blowing when the TV is switch ON


Without checking components associated with the TDA3653, the exact cause is impossible to say.
This IC has extensive built in protection circuitry that should protect it from overloads caused by such things as shorted turns in the vertical deflection coil, or from faults with any associated components, e.g. open/shorted resistors/diodes/capacitors.
The following data sheet describes this IC in detail:
http://www.datasheetcatalog.org/datasheet/philips/TDA3653.pdf

Therefore as the IC keeps failing at switch on, and if no other components are failing or suffering damage, suspicion must fall on the supply voltage delivered to Pin 9 and Pin 6 being excessively high (or spiked) and thus causing a rapid demise of the IC. As most LV (low voltage) supply voltages in TVs are derived from a common regulated source, this would imply that the power supply circuitry itself may be faulty - dried out electrolytic capacitors being prime suspects.

However, as with any fault in complex circuitry such as this, there may be other causes including less logical ones such as dry joints or shorts in wiring or between PCB tracks.

Nov 23, 2009 | Sansui Standard (CRT) Televisions

1 Answer

Proscan PS27123 TV Problem


just to be sure, is it vertical or horizontal? Anyway, if it is vertical, it could point out to the vertical Ic section or some loose contacts along the lines. If it is horizontal, it could be a filter capacitor along the horizontal Circuitry. Mark the high voltage capacitors along the high voltage sections.


regards,

chris

Jul 23, 2008 | Proscan PS27123 TV

2 Answers

Lightning Strike?


Assuming this line is across the screen horizontally (side to side), this means the vertical deflection circuitry is dead. In late model sets, there is a Integrated circuit package which drives the vertical yoke coils. Possible defects: the I.C. itself, bad solder connections where it solders to the board, missing voltage source to this I.C. (often around +24 volts), or a bad electrolytic capacitor in the associated circuitry. This latter often results in a non-linear picture, or less than full deflection condition, rather than a thin line only. It is possible lightning caused this problem, (I've seen some rather illogical damage from lightning ) perhaps it produced enough of a surge to pop the I.C. or a fusible resistor in that voltage source noted above.

Jul 03, 2007 | GE 24GP653 24" TV

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