tv aristona red led is flashing after turning up the tv about 4 Second?

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ZakSoldier$$$$

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tv aristona red led is flashing after turning up the tv about 4 Second , i saw that the red led flashing means (error 8) , opened the tv and i clean it (the motherboard and the little green card above the tv metal that with red Cabel rubber , and the tv works for 2 hours , now after starting the tv for 4 Second its only flashing , i thing the problem is from the power Supply near the motherboad .

the tv is old is not plasma lCD tv

can you help me
 
Take a look in "Sams Photofact" for that TV and look up all the voltages at the test points to help you narrow down where the bad part is. Sams Photofact should be available in your public library. Watch out you don't ground yourself on charged capacitors- the shock can be nasty and dangerous. That red rubber cable carries 25,000 volts when the TV is on. Be careful with that.

Examine the motherboard for cold or broken solder joints and repair any you find- especially the ones on control switches, jacks and pots.
 
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