Sony KDL-40ex400 LCD tv no power...100% dead

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

for voltage?

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

s-d .1v

[budm]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

That is good, the LED inside the OPTO PH6103 for 'POWER ON' as shown in the circuit should now be on which then turn on the Photo-transistor inside the Opto, so if you check the DC voltage on the pin 3 & 4 of PH6103, it should be <1VDC, this Opto will force the 'MODE' pin2 of IC6301 (CXA3809M) LO. I do not have the spec sheet of that IC, you need to look it up to see how it works.

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

thanks i appreciate ur help but im not a tv tech...so this is way above me....prob will toss out tv......all i know is i get no 12v and no 24v on psupply.......at this point its not worth it to me......i would like to learn but i cant have you spend ur valuable time......thank you

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

i really just want to know if ps is bad........u guys r too smart.....and i cant understand ur terms...sorry

[budm]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

May be you can donate it to local electronics training school for the students to learn how to do troubleshooting.

[Agent24]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

For the record, I found a datasheet for that IC (see attached)

According to it, Pin 2 (Mode pin) works thus:
Mode select input
(GND connection: Normal sequence
VCC connection: Standby mode)

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

i work 7days week 12.5hrs day as toolmaker.....and i own 6 rental houses.....my time is so limited.....this was kind of a hobby...i have fixed about 100 lcd and plasma tvs and 40 lcd monitors but most were board swaps or cap replacements.over the past 7 yrs.....but dont do it much anymore ..........im very novice.....

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

above me sorry.....have no clue what it means

[Agent24]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

What it means is, when the pin has a high input (at Vcc voltge) the IC is in standby mode. When the pin is brought low (to ground) the IC starts up and the power supply is supposed to turn on.

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

the ps for this tv is really expensive and so is the mainboard...that tells me its a problem with this model tv......

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

the ps does not turn on though

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

shopjimmy sellls a ps repair kit for this tv with 12 compobents and ic6301 is one of them..rest are ic6101,q6301 6302 6303 6304,r6107 6342 6348 ,d6308 ,f6101

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

i see ph6301 but no ic6301

and i see a 12v pin on ph6301 but its 0v when i meter it

but like i said have no clue uf that means anything

[Agent24]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

the ps does not turn on though

Does Pin 2 of IC6301 go from High to Low when you tell the PSU to start up?

i see ph6301 but no ic6301

and i see a 12v pin on ph6301 but its 0v when i meter it

but like i said have no clue uf that means anything

PH6301 is an optocoupler, that supplies feedback signal for monitoring the 12v rail, If the PSU is not running there is probably going to be no signal there.

The IC you're looking for is in the middle of the board on the bottom side, the big SMD IC, according to those ShopJimmy photos

[budm]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

Opto PH6103 is the POWER ON Opto, not PH6301.

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

i dont see ic6301

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

ok....i c it.....but have no clue where pin 2 is

[budm]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

If you look at the spec sheet, pin one is the one with the dot at the corner.

[shelby5041]

Re: Sony KDL-40ex400 LCD tv no power...100% dead

so is pin 2 to the right if 1......should i check voltage at pin 2 when i apply pwr on