Tv cuts off 10 seconds after switch on and destroying vertical output ic
This Sharp TV literally eats vertical deflection ics. I investigated with an oscilloscope and found that pin 22 of the main ic, X2933ce, has no output drive waveform going into the vertical deflection chip. There is not even a dc voltage on this pin which appears to be open. Unfortunately, this ic is prohibitively expensive. I tried to cross reference it with another similar looking ic on another board, X2701ce, but neither ic is listed in the NTE catalog.Has anyone had a similar problem, and is there an inexpensive solution that I may have overlooked?
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Re: tv cuts off 10 seconds after switch on and destroying...
If the main IC is not putting out a vertical drive signal then the vertical output will not do anything and therefore will not be damaged. What exactly do you mean by the set "literally eats deflection IC's"? What is the number on the vertical output IC? I will bet that your pump-up cap or pump-up diode is defective.
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Your vetical ouput deflection is gone that's why it will not power up. This is commonly caused of shorted vertical output IC. This is not DIY because the FF is still to be consider :
1. Fusible resistor in line with the supply of vertical output IC.
2. Yoke winding might be open.
3. No vertical output from the jungle IC.
I've advice you to send it to the nearest Sony service center in your area.
Hope it may help you.
Have a nice day.
Bad vertical deflection circuit, unless you have a bad connection (bang on set to set it it fills out for a second) . you will need components replaced such as the IC, capacitors possibly a fuse from the power source to the vertical IC.
If its a bad connection soldering the IC pins is not to hard if you are OK with taking it apart yourself.
This is a vertical deflection problem, These are the possible causes:
1) bad vertical coupling capacitor 2) bad vertical output IC 3) bad vertical driver IC 4) bad CRT deflection yoke
Troubleshooting needed: 1) using the TVs schematic locate the driver IC the output IC and the CRT yoke transformer. 2) using an oscilloscope look at the vertical driver signal it should be a sawtooth signal from the driver to the yoke (increasing in amplitude for each section, i. e. driver and output). 3) if no sawtooth patter is seen that is your problem, look for the component in the section where signal is entering but nothing is coming out. 4) replace the components
Now let me tell you something, don't continue to play the TV with the line present with brightness applied, this will burn the image of the line into the phosphorous coating of the CRT.
Yes the vertical circuit will shutdown the set if theres a problem with the deflection circuit. This model has a history of leaking CRT coolant on the boards near the vertical IC destroying the solder and actually eating through the circuit board. Check the area near the Vertical output IC for signs of coolant leakage or solder cracks.
vertical deflection problem. Vertical output IC, pump up cap, power to output problem, bad connections, jungle IC. Its a good idea to replace all electrolytic caps near the output IC. Bad caps cause it to run hot and self destruct.
TDA 8362B IC which have vertical freq.output is at pin no.43. (vert.osc)
for fixing this problem minimise brightness to avoid crt burn.
proceed as follows
1 if you are getting sawtooth at output of ic tda 8362 pin 43 then check
1 supply at vertical output ic from eht.
2 yoke connector loose .
3 check vertical output ic parts.
4 finally vertical ic.
please check for normal output from power supply even though fault gets rectified just for protection.