32 samsung lcd will not turn on just blinks 5 times

[ricosavy]

Hi everyone,
hope you can help me out i have a 32 samsung lcd tv model ln32c450e1d and the tv will have a red led power light when i plug it in.
Soon as i hit the remote to power it on it will blink 5 times red power light then the light will go off.the back light never comes on it does have the 24v to inverter.5v det only has 1.5v.There is also no voltage to e-pwm.the power supply the tv has is a BN44-00338B i am thinking the power supply is the problem but not sure.i uploaded the wiring diagram to board.I will post pictures of the power supply and tv.Any help will be appreciated thanks.

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

If the power supply is bad you will not be getting the 24V, since the PS_ON from the main board and the PFC Voltage booster is working.
I will wait to see good clear pictures of all the board and closed up pictures of the board as well.

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

here are pictures of the boards

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

Can I see closed up picture of the inverter board. I am looking for small black fuse for PWM controller IC. Please take the pictures in sections.
All the fuses on the inverter board are OK?

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

i checked fuses f1 f2 they both checked out good on inverter board will post picture

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

cn803 has all 24.73 voltages ,5v-det has 1.5,blu on has 0v,epwm has .068
cn 802 has all 12.21 voltages,5.27 voltages,b5v has 5.21,a5v has 5.22,ps on has .777ve-pwm has .006,blu-on has .038,5v det has .022
the blue light is not on nor is the red

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

The signals at CN802: pin4 BLU_ON (Backlights ON), pin5 E-PWM (Backlights Dimming Control signal) are generated by the Main board and then feed into CN802 which are then routed out to CN803, they do it this way to keep the wiring clean.
The Inverter ERROR Signal at pin4 of CN803 is generated by the inverter board and fed back to the main board, this signal may be or may not be used, Samsung usually does not use this signal in most of their TV. I will need to get the LCD panel model number to look up the spec sheet to see if the Inverter Error signal should be HI or LO when inverter board is working.
But right now you are not see more than 3VDC at BLU_ON, that means the Main board is not sending the signal to turn on the Backlights. You need to leave the meter on that test point, then turn on the TV to see if this signal goes up HI >3VDC.
By the way, do you have the diagram for the whole TV?

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

here are the pic of inverter board

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

OK, it does not use one of those black fuse on the inverter board. You need to look at BLU_ON signal and find the LCD panel number for me.

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

i put meter on blu-on there in on voltage when i turn tv on also there is no power led after the 5 blinks .also i have not been able to find a complete wiring diagram .the numbers i can find on panel are v315b5 -l06 rev c2
1qc246104r20720 cm31b56266tn6tn404p0736

model ln32c450e1d
model code ln32c450e1dxza
version no cn04
nmb-003 class b

looks like main board not sending signal for blu-on

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

That is what it looks like at this point, but I need to find out from the spec sheet of the panel to see if the Inverter Error is causing the BL_ON not to come on or not.

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

OK, I found the spec sheet:
Abnormal condition, the ERROR signal will be HI, 5V (see page 11), normal = 0.8V or less. So that is not the problem.
Panel spec:

So you may have main board problem. The T-CON is built-in the panel. I need to find out what the blinking code is. Not much inside this TV at all.

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

what would happen if i apply 3.3 volts to connector that connects from main board to power supply blu-on would that light panel or just short something.at this point looks like main board has problem

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

i unpluged the connector on main board and pluged the power cord in and the back light came on .means the main board has a problem with the blu-on i will try and trace the circuit see what problem is .

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

Check to see if it has 3-pin voltage regulator IC's, something like 1117-33, etc.

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

it has two of them that have number 1117z 1008fg

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

OK, label the pin as 1, 2, 3 (looking at it with two pins pointing down, make the left pin as 1, middle as 2, right pin as 3).
Measure the DC voltage on each pin and ground and tell us what you get (set the meter to 20V scale if you can).
Any pictures?

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

there are two 1117 one nearist to plug has 1.8 on pin4 output and 3.3 and pin1 .629 it grnd or adjust the one near the tuner has pin 4 has 3.3 and pin 4 vout has 1.2 and and pin 1 has 0 grnd or adj

the is another one different number m116 950t45 has 2.5 one pin and 3.38 other 0v on the base

[ricosavy]

Re: 32 samsung lcd will not turn on just blinks 5 times

pin 1 .629v pin 2 1.8v pin3 3.3v this one near connector the one near tuner is pin 1 0v pin2 1.2v pin3 3.3v these are the 1117z


there is one m116 950t45
pin 1 3.38 pin 2 0v pin 3 2.5

just saw your post

[budm]

Re: 32 samsung lcd will not turn on just blinks 5 times

These 1117 variable regulator should have the following if it is working. You should set the meter to show more decimal points. The voltage between Adj pin and the Output pin should always be 1.250V due to internal 1.25V (+/- 2%) precision voltage ref. Then you add the 1.25V to the voltage reading between Adj pin and Ground to get what the output voltage should be. So on the first one the output should be 1.250 + 0.629 = 1.879V so it is good, within 2%.
The other one may be 1.25V regulator (your meter is not showing enough decimal points).

m116 950t45, this one I am not sure, but more likely to be 2.5V fixed regulator, will have to search the web for this one.