Orion SLED4668W TV will Not Power Up.

[TubeJunkie]

Hi. I have an Orion SLED4668W led tv. When I plug it up to the AC, the red power light comes on. As soon as I press the power button, the red power light goes off, but I have no picture or sound. I've looked for buldging caps, but found none. No signs of heat damage either. I replaced a few caps on the power board with what I had in stock. Anyone have a service manual for this model? Any advise is greatly appreciated. Thanks

[budm]

Re: Orion SLED4668W TV will Not Power Up.

You can start with this:
https://www.badcaps.net/forum/showthread.php?t=39740

[TubeJunkie]

Re: Orion SLED4668W TV will Not Power Up.

Here's some pics

There's another board (looks like inverter board) under the power board and main boards

[TubeJunkie]

Re: Orion SLED4668W TV will Not Power Up.

It will only let me upload one pic at a time

[budm]

Re: Orion SLED4668W TV will Not Power Up.

I see cable with the white connector hanging out, where does that connector go too?
I cannot see where the connector for the Backlights is.
None of the connectors have the labels to tell us what each pins are for, it is not going to be easy repair.
Orion CEM886A (CCP-3400SY) Power Supply Unit
http://www.shopjimmy.com/orion-cem88...pply-unit.htm#
Pictures provided by shopjimmy

[TubeJunkie]

Re: Orion SLED4668W TV will Not Power Up.

I see cable with the white connector hanging out, where does that connector go too?
I cannot see where the connector for the Backlights is.

That red and white cable hanging off, goes to the power/function buttons board

[budm]

Re: Orion SLED4668W TV will Not Power Up.

There has to be a cable that goes to the LCD panel backlights, I cannot see it from the pictures.
It must have LED driver board some where that I am not seeing.
Orion/RCA 27-D063145 (L460H1-4EC) LED Driver.
Pictures provided by shopjimmy.
http://www.shopjimmy.com/cmo-27-d063145-led-driver.htm

[TubeJunkie]

Re: Orion SLED4668W TV will Not Power Up.

There has to be a cable that goes to the LCD panel backlights, I cannot see it from the pictures.
It must have LED driver board some where that I am not seeing.
Orion/RCA 27-D063145 (L460H1-4EC) LED Driver.
Pictures provided by shopjimmy.
http://www.shopjimmy.com/cmo-27-d063145-led-driver.htm

Yes, the LED driver board is under the power main boards. Look for the black cover in the pic that I moved the power board over

[budm]

Re: Orion SLED4668W TV will Not Power Up.

LED driver board connector CN1 has pin names for each pin, so check the DCV reading of each pin and make sure to put the pin names after each reading.

[eagle00799]

Re: Orion SLED4668W TV will Not Power Up.

I have the same tv with the same problem. I hate when people just desert the thread they started so I will pickup where this one left off.
I checked the voltages on C1 of the inverter board and this is what I am getting from left to right.
VBL=3.1mv
VBL=3.1mv
VBL=3.1mv
VBL=3.1mv
VBL=3.1mv
GND=-.2mv
GND=-.2mv
GND=-.2mv
GND=-.2mv
GND=-.2mv
ERR=.320v and jumping all over
ON/OFF=4.87v
NC=-.67mv and jumping all over
E_PWM=4.01v
Also on the main board all the 12v pins are reading .205v
What would you make of this Budm?

[stj]

Re: Orion SLED4668W TV will Not Power Up.

It will only let me upload one pic at a time

click "go advanced"
then click "manage attachments"

[eagle00799]

Re: Orion SLED4668W TV will Not Power Up.

like this

[eagle00799]

Re: Orion SLED4668W TV will Not Power Up.

I did replace the main board but same issues. power supply or inverter board next?

[budm]

Re: Orion SLED4668W TV will Not Power Up.

Can you trace the wires from VBL on the LED driver to see which connector on the power supply they connected to, also the same for the 12V which connector and which pin of the connector the 12V is connected to, right now the power supply board looks to be the problem, but you can also try disconnecting the cable to the VBL LED driver board to see if the 12V will come back.

[eagle00799]

Re: Orion SLED4668W TV will Not Power Up.

The connector on the right in the power supply picture CP3802 14pin goes to the inverter. I unplugged the inverter and the 12v stays the same at .205v. The 12volt wires go from pins 5,15 and 16 of the CP3801 connector on the bottom of the power supply picture with pin 15 being a red wire that runs to the first pin of connector CN6 marked INVERTER on the main board and pin 16 of CP3801 is the second wire(white) on CN6. Pin 5 of CP3801 goes to the last pin of connector CN4 marked MAIN POWER on the main board.

[RCA2000]

Re: Orion SLED4668W TV will Not Power Up.

OK I am BACK...after a long absence---due to email issues and such..

ANYWAY..as a quick guess...it sounds like you are NOT getting your "run" voltages from the power supply. that 4.47 volts is supposed to turn on the RUN supply. Likely all you have is the STANDBY voltages. Often you WILL get a power indicator in standby, but when you try ant turn the set ON...it will either go OUT--or blink and NO more will happen.

I will take a closer look...at your boards...and see if I can figger' out what voltage you should have...and where. I have done a LOT of this stuff...for YEARS...so it should NOT be hard to get a good idea..

[RCA2000]

Re: Orion SLED4668W TV will Not Power Up.

oK..I have an idea..

Looking at the PS board...wit the AC plug on top... to the very right.. there are a pair of diodes on the cold side...near a pair of decent-sized caps.. Take a meter and ground the - lead to the tv frame. Take the + lead..and CAREFULLY...touch it to the center lead of each of those diodes WITH the set turned on. I suspect you will N OT see much of a reading. if you do NOT...and you ARE getting that 4.7 volts from the signal baord...then this means the RUN supply is NOT working.

if SO...it is likely there is a problem either on the HOT side of this ckt..OR possibly..a LOAD(short ckt) on that line to ground.

[budm]

Re: Orion SLED4668W TV will Not Power Up.

Too bad the pins on the power supply board are not labeled.
Power transformer T3802 is for the 12V and VBL supplies, it is driven by tow power MOSFETs Q3817, 3818.
There is white fuse F3803 that supply the B+ to those two MOSFETs, the fuse is OK, right?
You can also check the DCV between the two legs of the main filter cap C3846 to see if it has close to 400VDC when power switch is activated, if you do then you do have PS-ON signal from the main board, right now you do have BL-ON and DIMMING signals from the main board.

[eagle00799]

Re: Orion SLED4668W TV will Not Power Up.

Voltages from connector CP3802 that goes to inverter are as follows
In Stby mode Powered On Inverter Unplugged
7.6mv 4.01v 4.5v
10mv and climbing climbing climbing
10.4mv 4.87v 4.8v
10mv and climbing climbing climbing
0 -00.3mv -00.3mv
0 -00.3 -00.3
0 -00.3 -00.3
0 -00.3 -00.3
0 -00.3 -00.3
0 3.2mv 3.2mv
0 3.2 3.2
0 3.2 3.2
0 3.2 3.2
0 3.2 3.2

[RCA2000]

Re: Orion SLED4668W TV will Not Power Up.

Voltages to the connector that goes to the SIGNAL board...are MORE important at this point.. See what they look like..