Won't come on with power button or remote- no blow fuses that I can find- has power to pwb- need help with this model
First thing on a Dead VZ7 to check is the solder connection at the yokes "DY" Connector. Then Check C411 2200uf @ 35V
Then C412 10uf @50V. Then Check IC700 Pin 20 for 0VDC any voltage other than 0VDC on that pin means Diode D980 is leaky.
Hope this helps. If you need anything further let me know.
Some key points
to remember when troubleshooting are:
1) It requires 16 VDC at pin 4 of the IC951 to start
the oscillator.
2) Q975 provides Soft Start Protection, applying
some positive voltage to pin 1 during
initial start up.
4) If pin 4's voltage drops below 11.5 volts the
oscillator shuts Off.
5) If the voltage at pin 4 increases above 22
VDC, the internal Over Voltage Protect
circuit shut the oscillator Off.
6) If the voltage at pin 1 reaches 1.35 VDC, the
Over Current Protect circuit disables the
oscillator.
7) A clicking sound indicates the IC is probably
defective.
8) A chirping sound usually is caused by an
excessive load on the Power Supply.
Excessive load on the Power Supply is usually caused
by a high current component in the TV, such as the:
. HV Output transistor
. Horizontal Output transistor
. Audio Output IC
. Convergence Output ICs.
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I know problem is in power supply. Just need help trouble shooting. REDCAT55
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