Acoustic solutions LCD26761HDF no backlight

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Sorry for measuring white pin out not properly 1-27
1--0v 2--0v
3--0v 4--07.9
5--0v 6--0v
7--0v 8--0v
9--0v 10--0v
11--11.8v 12--11.8v
13--0v 14--05.0v
15--03.2v 16--03.2v
17--05.0v 18--03.3v
19--05.0v 20--03.2v
21--0v 22--03.2v
23--0v 24--0v
25--24.3v 26--24.2v
27--24.3v

I missed 28 pin just realised doh..can retest if needed..too many paint fumes from decorating..what would be my next step..thx

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

I missed 28 pin just realised doh..can retest if needed..too many paint fumes from decorating..what would be my next step..thx

Im still stumped for getting my hands on a decent camera for now..i came across another forum while googling this model faults & 1 suggestion was to replace C802 & C934 the 2 block reddish caps which markings are 105K 450MFF & IC802 which is underneath them 2 caps ic marking E131 FAN7529..can any1 shed any light on this..thx
On the schematics ive attached that IC802 is a IRF7314 but i dont know owt about schematics..thx

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Im still stumped for getting my hands on a decent camera for now..i came across another forum while googling this model faults & 1 suggestion was to replace C802 & C934 the 2 block reddish caps which markings are 105K 450MFF & IC802 which is underneath them 2 caps ic marking E131 FAN7529..can any1 shed any light on this..thx
On the schematics ive attached that IC802 is a IRF7314 but i dont know owt about schematics..thx

Are these pics better for tracing 24v line..thx
My pics wont upload can i show them with another method..thx

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Are these pics better for tracing 24v line..thx
My pics wont upload can i show them with another method..thx

http://i1068.photobucket.com/albums/...5/P1000810.jpg
http://i1068.photobucket.com/albums/...P1000796-1.jpg
hope its ok for now using this method..thx

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

http://i1068.photobucket.com/albums/...5/P1000810.jpg
http://i1068.photobucket.com/albums/...P1000796-1.jpg
hope its ok for now using this method..thx

http://i1068.photobucket.com/albums/...5/P1000811.jpg
http://i1068.photobucket.com/albums/...5/P1000812.jpg
http://i1068.photobucket.com/albums/...5/P1000813.jpg
http://i1068.photobucket.com/albums/...5/P1000814.jpg
http://i1068.photobucket.com/albums/...5/P1000816.jpg
http://i1068.photobucket.com/albums/...5/P1000817.jpg
http://i1068.photobucket.com/albums/...5/P1000820.jpg
http://i1068.photobucket.com/albums/...5/P1000818.jpg
http://i1068.photobucket.com/albums/...5/P1000819.jpg
Any help plz to where i can start testing..thx

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

What is the voltage across the big main cap in operation and when in standby?

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

What is the voltage across the big main cap in operation and when in standby?

Your wanting me to get blown up lol..how am i testing this safely..thx
Am i black probe to ground screw and red to + leg of big cap..thx
http://i1068.photobucket.com/albums/...5/P1000822.jpg
heres my borrowed multimeter..thx

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

Your wanting me to get blown up lol..how am i testing this safely..thx
Am i black probe to ground screw and red to + leg of big cap..thx
http://i1068.photobucket.com/albums/...5/P1000822.jpg
heres my borrowed multimeter..thx

Set meter to 1000V or closest range >=500V.

Red lead on one terminal black on the other.

Nothing touching ground and don't touch the cap yourself or you'll find out that it hurts a lot.

[selldoor]

Re: Acoustic solutions LCD26761HDF no backlight

Rubber gloves and wellies!!

Set your meter on 600volts DC - Red positive lead on positive leg of capacitor and black negative lead on negative leg of capacitor. Put the meter where you can easily see it without moving.

Just looked at your meter DC is the Flat bar with 3 dots under it and the V. Take care as I notice the
probes are broken and possibly cracked? For this voltage Id tape them up a bit.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Rubber gloves and wellies!!

Set your meter on 600volts DC - Red positive lead on positive leg of capacitor and black negative lead on negative leg of capacitor. Put the meter where you can easily see it without moving.

That was scary but no permed hair lol
standby .946VDC
tv on 2.874VDC
.045 VAC &1.380 VAC from OL the readings werent steady they were up & down
Forgot i had this buried in cupboard..it read 400V in standny & tv on..thx
http://i1068.photobucket.com/albums/...5/P1000823.jpg
Should i recap all the psu caps with panasonics as they are all different named brands..or just hang on for now..thx

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

That was scary but no permed hair lol
standby .946VDC
tv on 2.874VDC
.045 VAC &1.380 VAC from OL the readings werent steady they were up & down
Forgot i had this buried in cupboard..it read 400V in standny & tv on..thx
http://i1068.photobucket.com/albums/...5/P1000823.jpg
Should i recap all the psu caps with panasonics as they are all different named brands..or just hang on for now..thx

Ive just hooked up dvd player as ived not heard sound as yet & sound is fine..so its just 24v not getting to the inverter..the fuse on inverter is fine..something is shorted or failing but no idea what that could be

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

I am confused, what DC voltage do you get on that large cap when TV is plugged in but not turn on, what is it when the TV is turn on?

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

I am confused, what DC voltage do you get on that large cap when TV is plugged in but not turn on, what is it when the TV is turn on?

Hi budm..im getting 342DC when just plugged in & same reading when power button pressed & blue led light on..thats with borrowed multimeter & 400V with my AC/DC voltmeter..thx
Getting 391DC when program button pressed as it must be on then & blue led is standby by..thx
So the cap is 450v is close to 400v enough?

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

391V is okay, PFC is working.

Got a pic of the controller for the 24V (on the bottom of the board usually?)

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

391V is okay, PFC is working.

Got a pic of the controller for the 24V (on the bottom of the board usually?)

Hi tom..is the controller on any of the pics ive already posted..thx
When i mentioned about ariel in & having no signal display on screen..on the back cover of the tv next to the antenna it says 5vdc..am i right assuming that the antenna needs 5v if so thats not working aswell cos my ariel on my house roof is in perfect order with 100% signal on my nearly fixed lg 42"

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

5VDC is probably for powered antennas... don't worry about it should be fine.

Near the power MOSFET for the 24V there should be an IC what is the name/number on it and a photo would be helpful can't make out much from your pics.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Hi tom..is the controller on any of the pics ive already posted..thx
When i mentioned about ariel in & having no signal display on screen..on the back cover of the tv next to the antenna it says 5vdc..am i right assuming that the antenna needs 5v if so thats not working aswell cos my ariel on my house roof is in perfect order with 100% signal on my nearly fixed lg 42"

I dont know what controller im looking for..the pics i uploaded from photobucket are they clear enough to trace the 24v line?

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

I dont know what controller im looking for..the pics i uploaded from photobucket are they clear enough to trace the 24v line?

Not really.

It will be a chip of some sort on the primary side.

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

Please look at the PDF, I need that P/N of the IC830 FOR THE 24VDC SMPS SECTION.
At this point the PS_ON is OK, the power supply with PFC controlled will use the same signal to turn on the PFC circuits and the 24VDC power supply section at the same time.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Please look at the PDF, I need that P/N of the IC830 FOR THE 24VDC SMPS SECTION.
At this point the PS_ON is OK, the power supply with PFC controlled will use the same signal to turn on the PFC circuits and the 24VDC power supply section at the same time.

Thx budm its been a very loooong day..the IC830 is FAN7711 VJ28..thx