Re: RCA LED42C45RQ screen blinks, but will not stay on
The LED driver circuit is a simple power supply, no boost converter or anything fancy like that. The TV uses two LED strings, each LED string is controlled by a MOSFET, so there is MOSFET per LED string to sink the LED current.
Both MOSFET's GATES (both GATEs of the MOSFETs are tied together) are driven by single driver IC.
So you need to check the B+ on the filter caps (either Cap ES1, or ES3) to see if the B+ goes away or not when BL-ON is present and stays present.
There are some filter caps for those two ICs in the LED power supply/driver circuits that you should check or replace them.
You also need to check the DCV of thse two MOSFET Drain pin for the LED string, you may have only one working string right now.
The LED driver circuit is a simple power supply, no boost converter or anything fancy like that. The TV uses two LED strings, each LED string is controlled by a MOSFET, so there is MOSFET per LED string to sink the LED current.
Both MOSFET's GATES (both GATEs of the MOSFETs are tied together) are driven by single driver IC.
So you need to check the B+ on the filter caps (either Cap ES1, or ES3) to see if the B+ goes away or not when BL-ON is present and stays present.
There are some filter caps for those two ICs in the LED power supply/driver circuits that you should check or replace them.
You also need to check the DCV of thse two MOSFET Drain pin for the LED string, you may have only one working string right now.
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