Proscan LED 32" TV not working.

[THERED117]

I’ve checked everything I can think of and have run out of ideas. It will not turn on and there is no stand by light. I have been looking for some schematic drawings with no luck. Thanks any help will be appreciated.

[vinceroger69]

Re: Proscan LED 32" TV not working.

We need good clear sraight on pictures of back of tv with cover off and one of each board.
We also need the voltages from the power supply connectors.
Format:
Pin Label - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.
Please remember we dont have the tv in front of us so we go from the information you provide us ie pictures voltage readings etc.

[THERED117]

Re: Proscan LED 32" TV not working.

So far all I could check was the Power board. Starting at the top and each pin grounded to its own plug gnd pin. each plug's measured voltage is separated with a semi-colon.
25.65, 25.65, 25.65, and 25.65 VDC : 25.67, 25.7 : 13.62, 13.62, 5.04, 5.04, 5.04, 5.04, 0, and 0 VDC

[THERED117]

Re: Proscan LED 32" TV not working.

I played with paint to see if this would help.

[vinceroger69]

Re: Proscan LED 32" TV not working.

theres two pins marked plus 5v so your getting no voltage to them as it looks like it uses the same pcb trace as the working two plus 5v pins or are they not used on the top side of the board
can you upload a picture showing the whole back of the tv and how all the boards are connected

[THERED117]

Re: Proscan LED 32" TV not working.

I separated the wires (i.e. the 5VDC).My finger is on one and my tweaker is pointed at the other end. The color bars are medium blue line and wire with no bands.

[THERED117]

Re: Proscan LED 32" TV not working.

Does anyone have an Electrical schematic?

[budm]

Re: Proscan LED 32" TV not working.

To make it easier for us to figure what Voltage and Control signals are present, please look at the bottom side of the board and list the pin names of each connector and follow by the the DCV readings for each pin after the power switch is activated.
http://www.shopjimmy.com/catalogsear...t/?q=PLED3216a
http://www.shopjimmy.com/proscan-ay0...upply-unit.htm
Pictures provided by shopjimmy.

[THERED117]

Re: Proscan LED 32" TV not working.

I thought I did. the only pins I didn't get VDC on was the bottom pins ie the 2 5vcd pins. Zoom in. Maybe?

[THERED117]

Re: Proscan LED 32" TV not working.

I thought I did. the only pins I didn't get VDC on was the bottom pins ie the 2 5vcd pins. Zoom in. Maybe?

I (DO) have 5 VDC on the pins mentioned above.

[vinceroger69]

Re: Proscan LED 32" TV not working.

thats good it looks like the psu is ok too me do you get any sound on the tv? maybe try a dvd player etc through a scart socket roughly at the centre of the tv theres two metal covers covering two boards tcon and led driver board naybe can you remove the covers and take pictures of these two boards

[budm]

Re: Proscan LED 32" TV not working.

It looks like the power supply board does not have the connector installed where the ON/OFF, ADJ pins are located for controlling the backlights circuits.
You do have PS-ON command signals so the main board is not completely dead that is why you are getting the switched 5V, 12V, and 24V.
The small board in the middle is the LED driver board, I can see two wire going to the main board which I believe those two wire contain the Backlights ON/OFF control signal and the Dimming control signal.
So check to see if the PS-ON pin does change state or not when you turn the TV ON and OFF.
Then probe those two wires on the LED driver board to see what DCV you have when turning the TV ON and OFF.

[THERED117]

Re: Proscan LED 32" TV not working.

PS-ON does not change. It stays high at 5VDC.
Ill get you the other info as soon as I can.

[THERED117]

Re: Proscan LED 32" TV not working.

Here is the other pics. Let me know if your guys need anything else.

[vinceroger69]

Re: Proscan LED 32" TV not working.

on your second picture theres a fuse marked f1 if you dont want too put all the tv boards back in place and measure the voltage to each side of the fuse you could measure the ohms reading straight across the fuse just to check its not open

[THERED117]

Re: Proscan LED 32" TV not working.

I was thinking that my stand by was in the center of my power button. I was mistaken. I found this a little while ago.

[vinceroger69]

Re: Proscan LED 32" TV not working.

yes thats the standby led board and remote sensor etc so the standby button led does work it looks like red in standy blue when on

[THERED117]

Re: Proscan LED 32" TV not working.

I believe its green when on. so.... Power supply looks good. what else do I need to check. I Work 11pm to 7am. CDT. Ill get back with you guys after my shift starts.

[vinceroger69]

Re: Proscan LED 32" TV not working.

sorry it is green i zoomed in on the pcb in your picture and now have seen the print g and r i would check you get voltage too both sides of fuse marked f1 im not sure why ps on voltage dosnt change so maybe a mainboard fault? im sure budm will advise us

[budm]

Re: Proscan LED 32" TV not working.

At this point you have main board problem, that PS-ON should never stay in one level, it should change state when power switch is toggled.
I see 3-pin Voltage regulator ICs on the main that you should check the Voltages, see the link on how to test and how to report the readings properly.