philips 42pfl3605/12 power board problem

[nazqul]

I have a philips 42pfl3605/12 with chassis tpm4.1e

It al started with no power up.
When i opened the back it whas sure that the famous IC905 was blown out.

I replaced IC905 but still no power. nothing at all, even not 5V

So after searching en measuring i found that trafo T904 also was broken
And suddenly after replacing the 5V was back

But still no power up

When i bridge the 5v with S/B its still doing nothing,
There is also a ENA , can i bridge that one to power up the powerboard ?

or someone has a tip to search the problem ?

[nazqul]

Re: philips 42pfl3605/12 power board problem

So i think de U7106 is bad

I meseared the chip and the voltages :

S/B : 2.8v
ENA: 1.9V
DIM: 2.6V
5V: 5V
12V: 0V
24V: 0V

[nazqul]

Re: philips 42pfl3605/12 power board problem

nobody has an idea ?

[angel-boy]

Re: philips 42pfl3605/12 power board problem

https://www.badcaps.net/forum/showthread.php?t=48787
Hope this helps you

[nazqul]

Re: philips 42pfl3605/12 power board problem

thx for the reply

the only thing i dont understand is that there is 5 v going in and 3.3 volt going out
It's like the 3.3v dont fully reach the s/b and ena output