Rca led40g45rq

[cmstech]

I have an RCA that just decided not to turn on yesterday, worked fine the night before. No blinking light or standby light. So I opened it up to see if the power supply had swollen or leaking caps. They look fine, no signs of anything burnt.

On the power supply I have tested the following

CON1

o +12V - 14
o +12V - 14.05
o ---
o |GRD
o ---
o +5V - 4.97
o +5V - 4.97
o 5VSB - 4.98
o PSON - 4.57
o +5V - 4.97
o No connection
o No connection
o No connection

CON 5

o GRD - 2.9
o ADJ - .592
o BL_ON - 2.6

CON 4 For LED

o LED + 114.2 (red)
o No Wire
o LED - 71.4 (Wht)

Main Board

Main Power
o +12V - 14.03
o GRD
o +5V - 4.97
o +5V - 4.97
o P5V - 4.97
o P5V - 4.97
o GRD
o GRD
o STB - 4.57
o 5VSB - 4.97

CONG1 ADJ

o - GRD - No wire
o - GRD
o - ADJ - 4.73
o - BL_ON - 0.1
o - +12V - No wire
o - +12V - No wire

CONA 3

o - GRD
o - GRD
o - +24V - 13.98
o - +24V - 13.98

Not much experience with TVs any help would be appreciated.

[ReeceyBurger123]

Re: Rca led40g45rq

Hmm probably best to start checking the Mainboard then do you know how to check voltage regulators ?

[cmstech]

Re: Rca led40g45rq

Hmm probably best to start checking the Mainboard then do you know how to check voltage regulators ?

No I dont. I have checked all the voltages on the main board. The connection that has the +24V only reads 13.98 on both connections. I have more pics if needed too.

[budm]

Re: Rca led40g45rq

CON 5

o GRD - 2.9
o ADJ - .592
o BL_ON - 2.6

CONG1 ADJ

o - GRD - No wire
o - GRD
o - ADJ - 4.73
o - BL_ON - 0.1
o - +12V - No wire
o - +12V - No wire

CONA 3

o - GRD
o - GRD
o - +24V - 13.98
o - +24V - 13.98

Some of your readings do not make sense, one connector has BL-ON of 2.6V, but 0.1V on another connector?

GRD has 2.9V?
24V Pins have only 13.98V?

How about up loading some good clear straight shot pictures of the whole boards and the whole back side of the TV so we can see how all the boards are connected together?

[cmstech]

Re: Rca led40g45rq

CON 5

o GRD - 2.9
o ADJ - .592
o BL_ON - 2.6

CONG1 ADJ

o - GRD - No wire
o - GRD
o - ADJ - 4.73
o - BL_ON - 0.1
o - +12V - No wire
o - +12V - No wire

CONA 3

o - GRD
o - GRD
o - +24V - 13.98
o - +24V - 13.98

Some of your readings do not make sense, one connector has BL-ON of 2.6V, but 0.1V on another connector?

GRD has 2.9V?
24V Pins have only 13.98V?

How about up loading some good clear straight shot pictures of the whole boards and the whole back side of the TV so we can see how all the boards are connected together?

I re-tested all of those connections and the readings are correct.

I will upload more pictures. I will have to wait till in the morning to take more shots of the back of the boards.

[cmstech]

Re: Rca led40g45rq

A few more pics. The other pics show the connections on the back of the boards.

[budm]

Re: Rca led40g45rq

Well, I cannot see how GRD (GND) pin can have 2.9VDC on it.
What did you use for GND ref point for your meter?
CON 4 For LED

o LED + 114.2 (red)
o No Wire
o LED - 71.4 (Wht)
What do you get on the LDED + if the connector is not in place?

[moalbert852]

Re: Rca led40g45rq

IMO you should replace the eeprom loacated between main chip and lvds connector.

[cmstech]

Re: Rca led40g45rq

Well, I cannot see how GRD (GND) pin can have 2.9VDC on it.
What did you use for GND ref point for your meter?
CON 4 For LED

o LED + 114.2 (red)
o No Wire
o LED - 71.4 (Wht)
What do you get on the LDED + if the connector is not in place?

First thank you for the help bud.

I used the chassis on the TV the other grounds reads 0 that I checked.

On the red LED+ W/ connector removed reads 116.0V / white still reads 71.4v

I noticed this morning the power supply board is making some noise. I originally suspected the power supply but did not want to just buy parts that are not needed. But the GRD reading and the +24 readings I dont understand either.

[cmstech]

Re: Rca led40g45rq

IMO you should replace the eeprom loacated between main chip and lvds connector.

Is there a way to check it? And if so, how? Anyone?