UE32C5100 Standby Only

[StephenU]

Hi all I have the following TV which I'm trying to repair. I'm only getting 5v standby on the output of connector CNM801 (pin 16). No other voltages present and TV won't come out of standby. Both fuses are fine and I've also checked the backlights are working and they are fine.

PSU - BN44-00351B

Any help would be appreciated, thanks in advance.

S.

[dick_barton]

Re: UE32C5100 Standby Only

Disconnect the mainboard and connect pin 16 to pin 18 using a 1K resistor. Then check you have all the voltages on that connector.

[StephenU]

Re: UE32C5100 Standby Only

Sorry can't seem to find a 1K only one I have found is a surface mount one. I'll need to order some up. Unless there is another option. Thanks

[dskall]

Re: UE32C5100 Standby Only

Something close. I have just jumped direct and haven't had a problem. But better to bring voltage down with resistor

[dick_barton]

Re: UE32C5100 Standby Only

Go around to any local electrical repair shop and scrounge some.

[budm]

Re: UE32C5100 Standby Only

The value can be anything from 330~1000 Ohms, it is to limit the current in case the connection is made wrong.

[dick_barton]

Re: UE32C5100 Standby Only

On many set you can jumper without a resistor but unless you have the circuit diagram in front of you it can actually cause damage.

[StephenU]

Re: UE32C5100 Standby Only

Thanks all I'll be grabbing a few things from Maplins on way home today so will also get a few resistors also. And see how I get on later. (Hopefully can repair it as I've noticed a few on the bay for £50+, don't fancy forking that out tbh.!!)

Thanks again.

S.

[StephenU]

Re: UE32C5100 Standby Only

Disconnect the mainboard and connect pin 16 to pin 18 using a 1K resistor. Then check you have all the voltages on that connector.

Readings took with 1K res in place across 16-18

Pin 1 - 13.27
Pin 2 - 0
Pin 3 - 13.27
Pin 4 - 2.951
Pin 5 - 13.26
Pin 6 - 5.126
Pin 7 - GND
Pin 8 - GND
Pin 9 - GND
Pin 10 - GND
Pin 11 - 5.279
Pin 12 - 0
Pin 13 - 5.279
Pin 14 - 5.279
Pin 15 - 13.26
Pin 16 - 5.279
Pin 17 - 13.26
Pin 18 - 1.164

[dskall]

Re: UE32C5100 Standby Only

You will make it easier on us if you give us pin descriptions

[StephenU]

Re: UE32C5100 Standby Only

Silkscreen on the PCB

Pin 1 (D12V) - 13.27
Pin 2 (DET) - 0
Pin 3 (D12V) - 13.27
Pin 4 (BL ON)- 2.951
Pin 5 (D12V) - 13.26
Pin 6 (PWM) - 5.126
Pin 7 - GND
Pin 8 - GND
Pin 9 - GND
Pin 10 - GND
Pin 11 (D5.3V) - 5.279
Pin 12 (GND) - 0
Pin 13 (D5.3V) - 5.279
Pin 14 (D5.3V) - 5.279
Pin 15 (Vamp) - 13.26
Pin 16 (SB) - 5.279
Pin 17 (Vamp) - 13.26
Pin 18 (PS) - 1.164

[dskall]

Re: UE32C5100 Standby Only

How are you trying to power on? With remote, power button on tv. With everything plugged in do you get anything on PS when you push button?

[dick_barton]

Re: UE32C5100 Standby Only

Those voltages all look fine except for Pin 2 (DET) which I'm unsure of what value it should be.

So once again disconnect the mainboard and connect pin 16 to pin 18 using a 1K resistor and also a 1K resistor between pin 16 to pin 4 (Backlights On) and see if the backlights come on?

[dick_barton]

Re: UE32C5100 Standby Only

I've just re-read your first post and you say that the backlights are working.
Put the resistors to one side for now and reconnect your mainboard and check the dc voltage at Pin 18 when in standby and when you attempt to take it out of standby and post results.

[StephenU]

Re: UE32C5100 Standby Only

When I connect the TV back up and apply power, I get basically 0v then it jumps to 0.7v on pin 18 and does this every 3/4 seconds, no response from remote or touch power sensor. When I disconnect power the DC voltage slowly drops from 0.7v to 0v

[dskall]

Re: UE32C5100 Standby Only

You may have a bad voltage regulator on main board. Maybe some good pictures of main board.

[StephenU]

Re: UE32C5100 Standby Only

Hope these help guys, thanks.

[dick_barton]

Re: UE32C5100 Standby Only

It looks like you are not getting PWR_ON from the main board so whatever the problem is it's not the power supply.
Some good photo's of your mainboard would be good.

[StephenU]

Re: UE32C5100 Standby Only

heh guys, plugged it all in and run a hairdryer over the mainboard and within 30 seconds tv booted up fine, so most definitely mainboard issue....

mainboard number - BN41-01549B

[budm]

Re: UE32C5100 Standby Only

Pictures of the Main board?