Acoustic solutions LCD26761HDF no backlight

[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

[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.

[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.

[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

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

[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

[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

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

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

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

From the underside the 1st smd from the black connector is D861 a small black diode im presuming?this reads 806 one way & 198 the other..if this is a diode im guessing this is faulty right?..ive tested the other small smd black diodes & readings 1 way & stays on 1 the other..thx
Tested that diode with my fluke as i tested it prior with my cheapy multimeter..readings from .OL it gives 1 beep & .208 the reverse .722
The only markings on that D861 is AP..thx

Ive found this while googling does it help till i can chase a decent camera thx..it was in another tv forum & said it was same layout..thx

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

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Please make sure to put the camera in MACRO mode for good close up pictures.

From the underside the 1st smd from the black connector is D861 a small black diode im presuming?this reads 806 one way & 198 the other..if this is a diode im guessing this is faulty right?..ive tested the other small smd black diodes & readings 1 way & stays on 1 the other..thx
Tested that diode with my fluke as i tested it prior with my cheapy multimeter..readings from .OL it gives 1 beep & .208 the reverse .722
The only markings on that D861 is AP..thx

Ive found this while googling does it help till i can chase a decent camera thx..it was in another tv forum & said it was same layout..thx

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

Please make sure to put the camera in MACRO mode for good close up pictures.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

The first two pictures are really out off focus, I can hardly trace out the traces from the black connector to the surface mounted components.

I,ll have to borrow a decent camera as mine is s..t

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

The first two pictures are really out off focus, I can hardly trace out the traces from the black connector to the surface mounted components.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

One of those pin on the White connector with double-row pin on the right side of the P.S. board will be for PS_ON signal input from the main board, but since the board is not labeled, it will be hard to trace out the connections.
The red wires on the balck connector on the left side of the board will be the 24vdc out put.
I agree with Tom66, the good clear pictures of the bottom side of the board may help us tracing out the connections.

Desoldered that schottky readings are same sequence as 1st test
just stays on .OL
1 beep .279
1 beep .279
just stays on .OL

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

One of those pin on the White connector with double-row pin on the right side of the P.S. board will be for PS_ON signal input from the main board, but since the board is not labeled, it will be hard to trace out the connections.
The red wires on the balck connector on the left side of the board will be the 24vdc out put.
I agree with Tom66, the good clear pictures of the bottom side of the board may help us tracing out the connections.

[tom66]

Re: Acoustic solutions LCD26761HDF no backlight

The STPS20S100CFP is a power schottky, see here: https://cdn.badcaps-static.com/pdfs/...b186bda3b6.pdf

Post a picture of the underside of the board.

It is probably 24V.

[sienoki]

Re: Acoustic solutions LCD26761HDF no backlight

Are there any labeling on the white pin to the right of the power supply board? The one on the top left is for the 24vdc, dimm, and Backlight_ON connectionS which goes to the inverter board.

All the mosfetts or schottky attached the the heatsinks are marked Q with no on psu...the white pin out PL816 has no labelling or markings any where on psu for output voltages

[budm]

Re: Acoustic solutions LCD26761HDF no backlight

Are there any labeling on the white pin to the right of the power supply board? The one on the top left is for the 24vdc, dimm, and Backlight_ON connectionS which goes to the inverter board.