Sony KDL-40S5500 main board fuse

[flocko]

hi this Sony powers on with backlight, responds to remote but no picture i have the same T.con from the same set i striped last year but have not sold as yet, fitted it and just the same, the main from the set is long gone, so pull the main and start to go over it as i know they have lots of fuses most check ok, but the one in the photo is open it has 9H or H6 on it and on the board 24v 5A, also there is a reference to PS7800 24v 3.15A fuse that i just cannot find, my task for you all is were will i find a replacement fuse and can you see the lost fuse Flock

[budm]

Re: Sony KDL-40S5500 main board fuse

I see 5 fuses, but the one close to the LVDS connector need clearer picture in that area. There may be more.

[flocko]

Re: Sony KDL-40S5500 main board fuse

Budm Sorry dont understand red circles?

[budm]

Re: Sony KDL-40S5500 main board fuse

Those are fuses., PS6XXXX.

[flocko]

Re: Sony KDL-40S5500 main board fuse

Sorry again your photo was not there when i posted back to you yes i see the fuses you point out and have checked them all good the one i am saying about is in the last photo on the by end of the socket top right hand corner

[budm]

Re: Sony KDL-40S5500 main board fuse

I need better picture in that top right corner.

[flocko]

Re: Sony KDL-40S5500 main board fuse

i hope better photos

[flocko]

Re: Sony KDL-40S5500 main board fuse

also forgot to say the socket is power not LDVS

[budm]

Re: Sony KDL-40S5500 main board fuse

It looks like the fuse for the B+. Do you get any 24V there?

[flocko]

Re: Sony KDL-40S5500 main board fuse

Budm do you think that is the fuse as i am not sure as all the other fuse are bigger and only rated at 3.15A and this one is rated 5a i had it as the black item showing H6 /9H

[budm]

Re: Sony KDL-40S5500 main board fuse

Not 100% sure since it does not have the same body as the other fuses, just check and see if it is connected back to the power supply board 24V line. I cannot find the service manual for this model yet.

[flocko]

Re: Sony KDL-40S5500 main board fuse

i have just put my good eyes in and your right at has a 5 on it so must be the fuse, but checks out good, so i have one last one to find thats marked PS7800 24v 3.15A, but i do not seem to be able to find it, there was one more on the back but that checks out good as well

[budm]

Re: Sony KDL-40S5500 main board fuse

BTW, the "24V" is not the voltage feeding the fuse, it is the fuse Voltage rating.

[budm]

Re: Sony KDL-40S5500 main board fuse

It looks like it may not be installed. Do you get any voltage at the SMD fuse on the T-CON board?

[flocko]

Re: Sony KDL-40S5500 main board fuse

Yes i was getting 12v. the set power up with backlights so black screen and i put a known good T.con in with the same result if i pull the LDVS it goes white screen so dont think it the panel,i will put the main back in tomorrow and see what i can find,i was hoping it was to be an easy fuse fix, Sony do like a fuse dont they, Thanks for your help Budm will post and tell you what i find Flocko

[tibimakai]

Re: Sony KDL-40S5500 main board fuse

Do you have all the voltages at the power supply connector?

[flocko]

Re: Sony KDL-40S5500 main board fuse

In think so but i have the board out of the set till tomorrow, but will check it all and get back with what i find, i must repair it i have had the set for weeks now, thanks Tibimakai

[flocko]

Re: Sony KDL-40S5500 main board fuse

Have put the main back in today and started taking reading and all seems fine on the power board 12v/15v/3.3 stby /3v ac det and 3,2v PSon, the only thing that i am not sure of is the balancer board supply,as the backlight does seem dim, its marked as Vcc 12v and 12v is present the two marked FB show .02v going to .00 the two marked LD show 11.39v as i am not familiar with these i do not know what FB and LD refers to.As for the checks on the main, i have 11.9v to all the fuses that were looked at on my last post including the T.con

[budm]

Re: Sony KDL-40S5500 main board fuse

FB is the AC feedback voltage, will be in milli volt AC range. LD should be around 11~12V to be good.
"hi this Sony powers on with backlight" but your backlights circuit is OK, you do not have pictures on the screen even with another T-CON so problem is some where on the main board.

[flocko]

Re: Sony KDL-40S5500 main board fuse

thanks Budm Ld= 11.39v but was unsure as i said the backlight comes on bright for a second or two then dims, the screen is so dark you can only see the backlight is on by looking though the back panel holes, i have started going over the main but have not got very far,Tibimakai ask if i had checked the power board voltages so that was more for him