sony bravia KDL-40S4100 relay clicking

[jose6326]

So I picked up another tv

When I first got it I plugged it in and you hear the relay click once and the screen is black
And no standby leds nothing indicating power on

I push the power button and the relay would click again still a black screen but the green power on LED turned on

The fuse in the psu and the tcon are good
No bulging caps on psu or main board

After I push the power button again to turn off tv the relay clicks green led goes off and no standby led. After 30 seconds or so with tv unplugged from power source relay clicks again

Here are the voltage readings I got with power on green led on

CN301
15.66v
7.15v
3.4v
11.54

CN302
3.2v

CN503
11.54v

Not sure if I was supposed to test ps on, fb, ld

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

So I decided to see what would happen if I didconnected the connectors from the psu to the main board

I disconnected CN303
I pkugged in the cord rekay clicked once I pushed the power button green led came on and so did the backlight which seems to be flickering quickly

I took some readings again

CN301
15.4v
7.15v
3.42v
11.54v

CN301
3.28v

Im guessing there is a problem at the main board?

What else should I test?

[budm]

Re: sony bravia KDL-40S4100 relay clicking

LD should be close to 11~12vdc, FB less than a volt.
Service manual:

Training manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

Should I reconnect connector on CN303 or it doesn't matter?

I did both

Disconnected
FB 0.000
LD 10.40v

Connected
Same readings as above

Is it ok that I use chasis ground to get reading?

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

bud

thanks for the training manual

after looking at the flow chart it seems that that issue is pointing to a defective main board

on page 22 it shows test points on the main board but not sure what type of readins or how to test certain components

is it possible to repair the main board instead of ordering one?

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

This is a common problem. I worked on a 46S4100 with a similar main board issue. I never attempted a repair, as I suspected one of the BGAs might be faulty or have a bad connection. I got a replacement board from Tristate Module. You'll probably need to match up serial numbers to find a substitute if your original isn't available. Shopjimmy has good info. There was a guy on eBay who was offering a repair service, but it was relatively expensive (about $150).

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

yea i am on ebay now there are a few main boards there
but they are a little pricey for a 2008 model

is the serial number really important?

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

Yes, the serial num is normally important to find a suitable substitute for the original if the original part isn't available. Do a search on shopjimmy by your tv model number, and they will provide guidelines when you select the main board.

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

LD should be close to 11~12vdc, FB less than a volt.
Service manual:

Training manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

On page 22 of the training manual there are test points

Does anyone know if I test these on diode mode or vdc mode?
Do I test with both leads on the components or negative lead on chasis and positive lead on each leg?

Thanks

Thanks

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

All those tests are done with the TV running: DC voltage scale. The negative lead should be grounded to the chassis. Maybe you're more ambitious than me in testing this TV (I didn't want to spend much time on the TV), and you'll find a faulty component that can easily be replaced. My hunch is that one of the processors is bad, though.

What is your TV's serial num?

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

Yes, the serial num is normally important to find a suitable substitute for the original if the original part isn't available. Do a search on shopjimmy by your tv model number, and they will provide guidelines when you select the main board.

Is the serial number located under the part number?

Or is it the bar code number?

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

Is the serial number located under the part number?

Or is it the bar code number?

It should be on the back cover of the TV - something like 1350001.

[budm]

Re: sony bravia KDL-40S4100 relay clicking

The numbers on that barcode are for the PCB assembly (PCBA), they are the number you should match with the repalcement PCBA.
http://www.shopjimmy.com/catalogsear.../?q=5571h01411

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

All those tests are done with the TV running: DC voltage scale. The negative lead should be grounded to the chassis. Maybe you're more ambitious than me in testing this TV (I didn't want to spend much time on the TV), and you'll find a faulty component that can easily be replaced. My hunch is that one of the processors is bad, though.

What is your TV's serial num?

Well im starting to get into this electronic stuff
I really like it but Im way behind compared to you guys
I have always liked electronics and now I just like fixing tvs to resell them to my family members

Anyways I rather test components than replace the whole board if possible. I am a cheap ass lol

So I tested the main board components following the training manual
For each component I labeled L1, L2, and L3 to identify each leg of the individual components. The voltages in the parenthesis is what is in the training manual

Here is what I got

U1105 (1.8v)
L1: 0.000v
L2: 3.36v

U1104 (5v)
L1: 3.86v
L2: 7.13v

U1106 ( 1.2v)
L1: 0.000
L2: 1.2v
L3: 2.97v

U1103 (8v)
L1: 6.87
L2: 8.13v
L3: 11.49v

U1108 (1.8v)
L1: 0.000
L2: 1.78v
L3: 3.33v

U1109 (5v)
L1: 3.97v
L2: 5.22v
L3: 7.10v

Im guessing 104 and 105 are bad?



Here is the serial number of the tv
1059136

[budm]

Re: sony bravia KDL-40S4100 relay clicking

What are the L3 for those two ICs?
Are there P/N printed on those two ICs?

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

Well im starting to get into this electronic stuff
I really like it but Im way behind compared to you guys
I have always liked electronics and now I just like fixing tvs to resell them to my family members

Anyways I rather test components than replace the whole board if possible. I am a cheap ass lol

Since you're fixing to resell, time is money, as they say. That was one of the reasons I just bought the board and sent the TV out the door; I wanted to move it fast, and there weren't many known simple fixes for Sony main boards like there are for a lot of the Vizios.

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

I didnt test them because they are not being used

But I can test them

The are good
The leg that isnt being used read good

U1105
1.8v

U1104
5.17v

I was hoping it was one of those that were defective

[budm]

Re: sony bravia KDL-40S4100 relay clicking

OK, that center pin is connected internally to the big tab. So they do look bad, I can see one of them has 18 printed on the body, so it should have 1.8V output.

[jose6326]

Re: sony bravia KDL-40S4100 relay clicking

OK, that center pin is connected internally to the big tab. So they do look bad, I can see one of them has 18 printed on the body, so it should have 1.8V output.

So they are or are not defective?
Because U1105 center pin has 1.8v when I tested it

Here are the numbers printed on the body

U1105

1084-18
0814AK

U1104

APL1084
GK3BX

[capkid]

Re: sony bravia KDL-40S4100 relay clicking

It looks the panel model info is also needed for the KDL-40S4100 when identifying replacement main boards. It wasn't necessary for the KDL-46S4100.