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My 5200 don't turn ON


uveprom
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I have 2 port Atari 5200

 

When i press power button the led turn ON and next OFF and stay OFF,,, never stay ON,

 

S2 is Ok

4013 is Ok

Q6, Q7, Q10 are Ok

R61, C47 are Ok

VR1 & VR2 are Ok, can read only 1,5 volt in pin 1 VR2

 

Power Supply Ok

 

If i send pin18 to ground,,, led turn ON but only 3.4Volts in almost the chips, not 5V , NO VIDEO,

 

Somebody knows ?

 

I think a circuit short but i dont know where ?

 

Thanks for anwer,

Edited by uveprom
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