hi, i have a problem with the indicated motherboard. the power on led lights up but does nothing. the checks made are missing the + 5vrun and + 3vrun power supplies. precisely the anomaly should be in the part of the circuit indicated. I have inserted the power supplies in green. thanks
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Sony with MBX-224 mainboard problem
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Re: Sony with MBX-224 mainboard problem
Originally posted by giove View Posthanks for the reply, the 3valw and 5valw voltages are correct 3v and 5v. on the gates of the PQ29A as shown in the picture there are 3.3v while on the gate of PQ27 e PQ47 there are 0.4v.
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Re: Sony with MBX-224 mainboard problem
PQ31 Source need +12V if it's not there trace it back when this Fet switch on with the help of SUS ON PQ31 Drain gets +12_1 this Voltage pull up from there to PQ131 in put side
PR130 need +5VALW if it' not their tarce it back or put a jumper form +5VALW , PQ47 Drain must have +5VALW if it's not there trace it back , Do a continuity test PL16 to PR130 PQ47Last edited by Techtiger; 09-20-2019, 02:45 AM.
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Re: Sony with MBX-224 mainboard problem
Originally posted by giove View Postas I indicated the voltages 12V_1 5valw 3valw are present and are respectively 13v, 5v and 3v
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Re: Sony with MBX-224 mainboard problem
Lots of sony mb has this feature like mbx223/224/269. The +3V/+5V ALW will appear on coil for 10-20 seconds and will go away. thats the feature of this mb. So dont worry about that. your problem lies elsewhere. I'm 100% sure of what i'm writing as yesterday only i repaired a very complicated case of MBX-223 which came after several attempts to repair by earlier technicians.
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