RCA 32 LCD TV Model RLC3273A-B

[rasscal]

I'm having the exact same problems as the Set in this thread

https://www.badcaps.net/forum/showthread.php?t=25446

Same model, (when I get home I'm going to check the serial number to see if I didn't buy that exact TV as the OP)

Anyways, the symptoms are as follows.

Turn tv on (Standby LED goes from red to blue), backlight turns on, but no image on screen. About 5 seconds later backlight turns off. 3 seconds after that, set goes back to standby (blue LED turns back to red).

I checked the PSU voltages and they all seem fine, no visibly swollen caps. There is a pair of wires (BLON/PWM) from the mainboard directly to the inverter board. If I jumper the PSON the and the BLON to 5v, both the power supply and backlight turns on, and the backlight stays lit as long as I leave it that way, so it appears neither the PSU or inverter has a problem.

To test this out, I completely disconnected the inverter (no power, no BLON/PWM) and I disconnected the T-Con from the mainboard. I also disconnected the 24V line to the Mainboard (which appears to be for the audio amplifer portion of the mainboard)

I just left the control button/IR/Power LED board and the +5v/12V/5SB connections attached and switched on the set. Same result, LED turns blue, but goes back to red (standby) after about 8 seconds (5+3), so it appears that the problem is with the Mainboard.

Can anybody confirm my diagnosis?

BTW, the mainboard is marked CV318H-X which appears to be used in many RCA/Westinghouse/Curtis/? sets. Anybody have a schematic or any idea what might have failed on it if it is indeed the problem?

Thanks.

[multimeter]

Re: RCA 32 LCD TV Model RLC3273A-B

I'm having the exact same problems as the Set in this thread

https://www.badcaps.net/forum/showthread.php?t=25446

Same model, (when I get home I'm going to check the serial number to see if I didn't buy that exact TV as the OP)

Anyways, the symptoms are as follows.

Turn tv on (Standby LED goes from red to blue), backlight turns on, but no image on screen. About 5 seconds later backlight turns off. 3 seconds after that, set goes back to standby (blue LED turns back to red).

I checked the PSU voltages and they all seem fine, no visibly swollen caps. There is a pair of wires (BLON/PWM) from the mainboard directly to the inverter board. If I jumper the PSON the and the BLON to 5v, both the power supply and backlight turns on, and the backlight stays lit as long as I leave it that way, so it appears neither the PSU or inverter has a problem.

To test this out, I completely disconnected the inverter (no power, no BLON/PWM) and I disconnected the T-Con from the mainboard. I also disconnected the 24V line to the Mainboard (which appears to be for the audio amplifer portion of the mainboard)

I just left the control button/IR/Power LED board and the +5v/12V/5SB connections attached and switched on the set. Same result, LED turns blue, but goes back to red (standby) after about 8 seconds (5+3), so it appears that the problem is with the Mainboard.

Can anybody confirm my diagnosis?

BTW, the mainboard is marked CV318H-X which appears to be used in many RCA/Westinghouse/Curtis/? sets. Anybody have a schematic or any idea what might have failed on it if it is indeed the problem?

Thanks.

if the voltage rail from the mainboard to ps_on is dropping off,it will trigger a series of shutdown procedures,does ps_on voltage drop off when monitering with your multimeter?,seeing as you have disconnected inverter etc,it could well be a main board failiure.

any pics of the psu,mainboard?ive seen the other thread pics,but they can be different,and may show up something that others and my self could see

[rasscal]

Re: RCA 32 LCD TV Model RLC3273A-B

if the voltage rail from the mainboard to ps_on is dropping off,it will trigger a series of shutdown procedures,does ps_on voltage drop off when monitering with your multimeter?,seeing as you have disconnected inverter etc,it could well be a main board failiure.

any pics of the psu,mainboard?ive seen the other thread pics,but they can be different,and may show up something that others and my self could see

Turns out my memory was a little off when I wrote my previous message. The startup sequence is like this:

Press power button. Set turns on, red LED turns Blue, PSON goes to 4.15 volts from 0.04
2 seconds later backlight turns on, but no image on screen
5 seconds later, backlight turns off AND LED turns red from blue
1 second later PSON goes from 4.15 to 0.04 volts.

I also watched the 5VSB and 5V lines and both were about 4.9volts.
The 5VSB never fluctuated as the set turn on or off.
The +5V switched off 1 second after the LED turned red (in step with the PSON line going low)

I was told that the set was only just over a year old, and there seems to be a few of these on the local Craigslist for sale "As-Is". Replacement boards don't seem to be available yet, although the mainboard design looks it's been around for a while. I think I might try a board from a different TV set to see if I can get the screen working.

Here are pictures. The back shows the pinouts

My set's serial number ends with 407, the one in the other thread ends with 545. I think I can safely say they are pretty much identical, right down to the part numbers on the boards.