Element ELCHW402 - Screen Does Not Turn On

[budm]

Re: Element ELCHW402 - Screen Does Not Turn On

They are normal, but how about the 24V at the connector that goes to the inverter board?

[dick_barton]

Re: Element ELCHW402 - Screen Does Not Turn On

I purchased two like kind replacement capacitors and recorded the following results:
C812 measured 4.48 uF out of circuit.
C811 measured 4.75 uF out of circuit.
Both new capacitors measured 11 uF out of circuit.

I installed the new capacitors at C811 and C812 and first plugged the 1K resistor connecting Standby and 5Vs. I was able to measure around 13V on N811 pin 12 and around 10 V on N811 pin 12, all referenced to negative of C810. Voltages were in the acceptable range listed in Dick's document. I then connected all of the boards to the main power board, pressed the TV Power button, and recorded the following results at the cold side connector when referenced to the chassis:
STB: 2.16 V
5V_S (#1): 4.94 V
5V_S (#2): 4.94 V
12V (#1): 11.99 V
12V (#2): 11.99 V
BR1: 2.84 V
5V_M (#1): 5.27 V
5V_M (#2): 5.27 V
SW: 3.02

These values seemed normal so I picked up the TV and saw the blue screen with no signal message. I connected an antennae and have the TV powered on and working for the past few hours.

Thanks to everyone for the knowledge and information. I enjoyed the whole process. My first successful electronics repair.

I have to admit that I would not have guessed changing out C811 and C812 would have solved the issue. Any tips on how to become better at troubleshooting power boards and following schematics?

Stay an active member of the forum and follow how other faults are tackled.

[jjl4999]

Re: Element ELCHW402 - Screen Does Not Turn On

They are normal, but how about the 24V at the connector that goes to the inverter board?

I measured 24.7 volts out to the inverter board across all terminals labeled 24V on the connector.

[jjl4999]

Re: Element ELCHW402 - Screen Does Not Turn On

Stay an active member of the forum and follow how other faults are tackled.

Will do Dick.

[budm]

Re: Element ELCHW402 - Screen Does Not Turn On

Glad it is working.