Why does this Sharp CRT TV turn on then click off a few seconds later?

pls. check if there has 5v ic regulator... also check the open non- electrolytic colored yellow or orange tantallum capacitor near the talc switches and memory ic.if i'm not mistaken.... the capacitor value is 2.2uf 50v.

Hi

Your tv set may have an overload in the supply line. Check its rectifier diode and filter capacitor. Another approach is to check if the DC supply line of the switch mode controller IC (UC4842 for exemple).is present (10/12V). If these are OK, replace the switching MOSFET transistor and check the source resitor for open circuit.

Sully

tda9380ps /n3/3/1664 using in sharp tv power supply ok ,but no EHT ,the power LED are glowing red light press program key to change green light to return in few miniutes to standby in red light

Hello

Your TVs vertical output section has the fault. You just open your TV after disconnecting it from the AC mains wall socket, and locate the vertical output section. This section uses an Ic marked as part [IC 401] on the board and its number is LA7840. Just look for any loose soderings around its components legs, and the solderings at the IC legs, which has 7 of them. The IC stated above will be screwed onto a heatsink to radiate heat out of it when it works.
If all soldering point are fine, come towards the IC legs and measure the voltages at each leg. The voltages must be
pin 1= Ground
pin 2= 12.6
pin 3= 24.7
pin 4= 4.4
pin 5= 4.4
pin 6= 24v [vcc]
pin 7= 1.8
All voltages stated above are DC voltages with respect to ground. If any of this voltage is missing, find out the reason for that. If all of them are noted abnormal, IC may be defective, and replace it.
[vcc] stands for main input voltage to the IC.
If you need any more assistance, feel free to contact me through Fixya. Ok.

Recheck the installation of the projection of the lamp?Close lid cover,make sure does not hit a protective switch.

Need to check an av switching ic. Make sure you got the 12v going to the ic, if missing troublle shoot power supply. If it is there, bad ic. Or if it is low, unsolder vcc pin and check for right voltage to see if the ic is bringing down the voltage.

check the b+ supply of your flyback if they have check the horisontal transistor. check also if they have 5v supply in the system and 9v in the chroma ic or replace the memory ic.please reply.

No picture - screen is empty. Sound is ok
Check IC101 (BA7630F), if video signal comes to input (pin 1) but not present at output (pin 14) then replace this IC
No picture and sound, only a high pitch sound at switch on
Remove horizontal transistor and measure the resistance across any two pins. This value should be no less than 200ohms
Picture fades away few seconds after start-up till no picture. Sometimes no picture at all. Sometimes picture OK for longer. Sound unaffected.
Faulty joints on CRT pcb. Cracked solder joints at tube socket connections on CRT circuit board. Caused variable supply to CRT heaters. Resolder all socket pins to pcb.

Probably flyback in this set, but you can check Horizontal output, a 3 pin Transistor standing up on a heatsink. Also Large cap in powersupply.

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.