SERVIS TV POLYTRON CUMA STANBY

Polytron Standby

Do not want to stand by "on"

     * Check whether the supply voltage Vcc 5v to normal mikrokontrol
     * Most frequently encountered because of Elko filter for voltage 40v C505 dry. Elco become dry resulting in the output voltage drops.
     * The aircraft continued to die on a minute. Sometimes the damage caused by D510. Because of this led 5v voltage during power-on to mikrokontrol drops

When the "power-on" voltage B + do not want to go up to normal (115V)

     * Check if the base voltage are T506 can be changed to zero. If not zero
     * Try disconnecting T505 - B + voltage should be increased to normal. If it can not rise to normal then the problem could be in the switching regulator. Check Elco B + FET may be dry or damaged.

When "power-on" horizontal does not work

     * Check if already got Hor Vcc voltage 8V
     * Check the supply voltage of 14V
     * Problems can be caused Elko flter dry 14V or 8V regulator circuit some problems

problem mikrokontrol

     * Base T506 unwilling to change to zero when the-power-on
     * Check the supply voltage Vcc 5v mikrokontrol
     * Check the pin oscillator is there a voltage of about 1 ~ 2v.
     * Check pin-reset if already there  4v
     * Check the path SDA / SCL might have short