RCA 32 lcd tv

[nelfig]

Ok so im new at fixing lcd tv's i just received a rca 32 inch lcd tv what it does it turns on i can see the back light on and then 5 seconds later it shuts off back into stand by mode ive opened it up but see no caps bulging or blown so what could it be inverter board or power board or tuner board the model is rlc3273a-b

[tom66]

Re: Need help with rca 32 lcd tv

I'd suggest a mod move this to the TV forum.

A good start is to let us know what equipment you have: soldering iron, digital multimeter, etc.

Second step is to post pictures, clear and in focus, of the TV's boards and one of the overall layout. Pictures up to 2000x2000 are supported; keep them around that size so we can clearly see the layout and the components.

[nelfig]

Re: Need help with rca 32 lcd tv

sorry for posting in wrong forum and yes i do have a multimeter and soldering gun magnafineglass and such here are some pics i hope it helps






model for power board cv318h-x
model for tuner board mp116a rev 1.0
model for inverter board v327-101 made by darfon

[tom66]

Re: Need help with rca 32 lcd tv

OK, do you see a pin marked 24V on the power supply?

Check the voltage here, using DC200V, black probe on chassis, red probe in pin area.

[nelfig]

Re: Need help with rca 32 lcd tv

only one i seen on the power board was this one i did what you said and the reading i got was 35.4 but that cable goes from the power board to the inverter board

[tom66]

Re: Need help with rca 32 lcd tv

Your meter needs to be set to DC volts, not AC volts.
If reading is still high replace meter battery.

[nelfig]

Re: Need help with rca 32 lcd tv

thats what it was set at and realized my batterywas no good now its reading 23.5

[nelfig]

Re: Need help with rca 32 lcd tv

so my guess is the inverter board is not working then

[tom66]

Re: Need help with rca 32 lcd tv

That would be a possible suspect. Is there a pin marked ON/OFF, BLON or BLON/OFF on the power supply?

[ratdude747]

Re: RCA 32 lcd tv

Moved as requested.

[nelfig]

Re: RCA 32 lcd tv

no just where the cable connects there is just ps on

[tom66]

Re: RCA 32 lcd tv

OK, that is unrelated for now. PSU is switched on (PSON) because 24V is present. Can we have a close picture of the inverter board?

[budm]

Re: RCA 32 lcd tv

Please post a good closed up pictures of the area around the white connector (the one that the 24v from power supply is connected to) on the inverter board. Darfon!

[tom66]

Re: RCA 32 lcd tv

Darfon?
Run! Although, often easy fix...

[nelfig]

Re: RCA 32 lcd tv

power supply connectors


right side


middle


left side

[budm]

Re: RCA 32 lcd tv

OK, thanks for the pictures, but please edit the post and use GO ADVANCED, MANAGE ATTACHMENT to up load the pictures instead of posting them in line which takes a long time to display the pictures.
If you look to the right of that multi-pin connector on the inverter board, there are printings that show the pin outs of the connector, check the DC voltage between the BL_ON pin and the chassis ground to see if you still have >3VDC when the screen black out.
See if this PANASONIC has the same dimensions:
http://www.digikey.com/product-detai...0759-ND/285441

Digikey does not have it in stock but you can check other place like MOUSER.

[nelfig]

Re: RCA 32 lcd tv

it comes up as 5v

[budm]

Re: RCA 32 lcd tv

OK, so when the backlights go out, the required voltage (24VDC) is present, the turn on command (BL_ON) is also present, but the lamps still go into shutdown. Then you need to look at the inverter board.
1) Check all the fuses (Fx) using 200 Ohm scale, they should show less than 1 Ohm.
2) I would check the transformer secondary high voltage winding of all the transformers to see if they are all within 3% of each other.
P/ as printed on the inverter transformer?

Notes: also check pin 14 (??? PWM) to see what you have.

[gopher]

Re: RCA 32 lcd tv

Hey there nelfig,
I just got the same tv with the same problem, were you able to find the problem?

[gopher]

Re: RCA 32 lcd tv

OK, so when the backlights go out, the required voltage (24VDC) is present, the turn on command (BL_ON) is also present, but the lamps still go into shutdown. Then you need to look at the inverter board.
1) Check all the fuses (Fx) using 200 Ohm scale, they should show less than 1 Ohm.
2) I would check the transformer secondary high voltage winding of all the transformers to see if they are all within 3% of each other.
P/ as printed on the inverter transformer?

Notes: also check pin 14 (??? PWM) to see what you have.

What should i have on pin 14?