32 inch lcd sound no picture

gobby009 · 11-07-2014, 07:32 AM

Re: 32 inch lcd sound no picture

update= grabbed a mainboard from ebay same board number just my board was a rev 6 this board i got of ebay is a rev 8 fitted the board tv works ok just the picture is a little dark.after examaning the board i got of ebay i noticed it has sum bulging caps on it and i think one cap is leaking.could this be the problem with dark picture?or is it because its a different rev number.

gobby009 · 10-31-2014, 11:16 AM

Re: 32 inch lcd sound no picture

tv was on all last night working fine on hd connection went to turn tv on this morning with hd connection lost picture after 3 minutes.backlights are on and so is audio.would it be worth putting some heat to the over the back of the mainboard with a heat gun.

gobby009 · 10-30-2014, 03:34 PM

Re: 32 inch lcd sound no picture

so do you think the bad part of the board is where the scart and svideo connections are as they are down the side and the hd is on the underneath

ReeceyBurger123 · 10-30-2014, 02:20 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

no the backlights were on with those voltage readings,tv has been on around 6 hours now on hd connection with no loss of picture

Bad mainboard then, you can get the for cheap on ebay.

gobby009 · 10-30-2014, 02:10 PM

Re: 32 inch lcd sound no picture

Originally posted by budm

So those Voltage readings on the inverter connector as shown when the backlights are not on?
https://www.badcaps.net/forum/attach...2&d=1414623817

no the backlights were on with those voltage readings,tv has been on around 6 hours now on hd connection with no loss of picture

ReeceyBurger123 · 10-30-2014, 12:03 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

so the problem with this tv is that from a cold start it would work for like an hour then loose picture but not sound with scart,tried svideo yesterday and the same.got sky hd plugged in today and its been going for 3 to 4 hours and hasnt lost picture yet.gonna leave it plugged into the sky hd all night and i will report back if it does loose picture.i plugged it into the sky hd to try and get a picture that reecey requested when it does loose picture but as i say its been going 3 to 4 hours on a hd connection with no loss of picture.

Sounds like there is a motherboard fault probably cold solder joins under one of the chips.

budm · 10-30-2014, 11:16 AM

Re: 32 inch lcd sound no picture

So those Voltage readings on the inverter connector as shown when the backlights are not on?
https://www.badcaps.net/forum/attach...2&d=1414623817

gobby009 · 10-30-2014, 10:47 AM

Re: 32 inch lcd sound no picture

so the problem with this tv is that from a cold start it would work for like an hour then loose picture but not sound with scart,tried svideo yesterday and the same.got sky hd plugged in today and its been going for 3 to 4 hours and hasnt lost picture yet.gonna leave it plugged into the sky hd all night and i will report back if it does loose picture.i plugged it into the sky hd to try and get a picture that reecey requested when it does loose picture but as i say its been going 3 to 4 hours on a hd connection with no loss of picture.

ReeceyBurger123 · 10-30-2014, 04:55 AM

Re: 32 inch lcd sound no picture

Can you take a picture of the sceen with the set on so we can see if the backlights are on or not.

gobby009 · 10-30-2014, 02:42 AM

Re: 32 inch lcd sound no picture

hope you can read the readings

gobby009 · 10-29-2014, 05:09 PM

Re: 32 inch lcd sound no picture

ok took some voltage readings hope you can read them.this was with the tv on.

picture 1 is the inverter plug on the mainboard

picture 2 is the psu

picture 3 is the mainboard from psu

again any help is appreciated.

Attached Files

ReeceyBurger123 · 10-29-2014, 02:31 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

took the plug out of the socket and the pins on the mainboard are fine as are the clips inside the plug.is there a way to cut that burnt looking cable back and reinsert it into the plug.looks like its hanging on by a thread.

Ok now put the inverter back in and set your meter to 20-200v dc then put the black probe to a ground then use the red probe to see if there is a voltage going though the connectors to the inverter while the set is on, can you get the model numbers of the psu ect and I will find a pin out diagram and show you where to test.

ReeceyBurger123 · 10-29-2014, 02:26 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

this is my multimeter.as i say i am new to this kind of operation i have repaired things like ghd cables ghd fuses iphone screens but there basicly taking things apart and replacing voltage troubleshooting is all new to me i do appreciate your help on this

To test that cable simply set your meter to ohms and the probe on one end of the wire and on the pin out on the bottom of the inverter and see if the ammount of ohms changes this will show if there is a connection or not make sure the set is off, also pull the wire block out of the connector and inspect it physically then resolder it if it is loose.

gobby009 · 10-29-2014, 02:23 PM

Re: 32 inch lcd sound no picture

took the plug out of the socket and the pins on the mainboard are fine as are the clips inside the plug.is there a way to cut that burnt looking cable back and reinsert it into the plug.looks like its hanging on by a thread.

vinceroger69 · 10-29-2014, 02:18 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

so these are some pics as you can see in the inverter cable at the top of the mainboard not sure if that looks like a burnt cable second from the end,could that be the cause? as you can see there is no way to test the inverter while its connected to the mainboards as it is under the main chasse.i took a picture of the old inverter i pulled out.can i check voltage from mainboard to inverter from that inverter cable at the top of the mainboard.once again any help is appreciated.

picture 6 the plug/socket with the damaged wire can you pull the wire block out and check the pins to see if they are melted or damaged.

gobby009 · 10-29-2014, 02:13 PM

Re: 32 inch lcd sound no picture

this is my multimeter.as i say i am new to this kind of operation i have repaired things like ghd cables ghd fuses iphone screens but there basicly taking things apart and replacing voltage troubleshooting is all new to me i do appreciate your help on this

Attached Files

ReeceyBurger123 · 10-29-2014, 01:56 PM

Re: 32 inch lcd sound no picture

Originally posted by gobby009

could you explain in detail how i do this.im new to a multimeter.do i put the red and black cable of the multimeter in the red and black on the mainboard inverter connector.did you notice the burnt cable in that picture?and how would i check the psu.thanks in advance

Can you take a picture of your meter please just help clarify things better.

gobby009 · 10-29-2014, 01:48 PM

Re: 32 inch lcd sound no picture

could you explain in detail how i do this.im new to a multimeter.do i put the red and black cable of the multimeter in the red and black on the mainboard inverter connector.did you notice the burnt cable in that picture?and how would i check the psu.thanks in advance

ReeceyBurger123 · 10-29-2014, 01:38 PM

Re: 32 inch lcd sound no picture

Check if the psu and motherboard are giving voltage to the inverter, dont test the inverter only test the connectors coming off the psu/mainboard.

gobby009 · 10-29-2014, 01:17 PM

Re: 32 inch lcd sound no picture

so these are some pics as you can see in the inverter cable at the top of the mainboard not sure if that looks like a burnt cable second from the end,could that be the cause? as you can see there is no way to test the inverter while its connected to the mainboards as it is under the main chasse.i took a picture of the old inverter i pulled out.can i check voltage from mainboard to inverter from that inverter cable at the top of the mainboard.once again any help is appreciated.

Attached Files