[TechAssist] Toshiba MV19N2 TV/VCR, Too Much Voltage

  • From: Paul <dntwntv@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Tue, 7 Jun 2005 18:17:15 -0700 (PDT)

Can't control the SMPS. Put more than 25 volts A/C and it blows caps and burns 
resistors. At 25 v A/C, the voltage on the drain of the switching tranistor is 
about 150v. On the secondary side the H/O tranistor has 180v. The voltages per 
the print should be 180v on the drain of Sw.xstr. and 262v on the HOP col. Have 
replaced Q510 and Q511 switching transistors,IC502 feed back and Q507 feedback 
switching transistor. Have replaced open R514 .33 1w and R501 3.3 5w resistors. 
Checked litic caps,diodes and resistors. Replaced three litics in secondary 
that smoked. Any ideas?
                                               Paul       

Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084

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