toshiba 42wlt66 needs help before I throw a hammer at it...!

[comptek]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

see my post its worth a try

only the green one for now see what happens
im not held responsible if it goes wrong its just a pointer

https://www.badcaps.net/forum/showpo...9&postcount=16

whole post
https://www.badcaps.net/forum/showthread.php?t=50454

[djsmasm]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

are you getting BL-On and PS-ON signal off of the mainboard ?

yes but only when BL-on is disconnected, otherwise power loops endlessly.....lol

the main question here is : is 320V instead of 370 normal......?

I've ordered two other 2039 ICs, but china to france can take a month.......!

[comptek]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

are you getting BL-On and PS-ON signal off of the mainboard ?

[djsmasm]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

can a moderator delete this thread?

nobody will notice it has gone.......

[djsmasm]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

If you know the Psu is the problem why throw it out ? Also maybe wait or Pm budm to help you debug the circuit.

the goal is to fix it, but it's really getting me angry to have this problem.....lol

[ReeceyBurger123]

Re: toshiba 42wlt66 needs help before I throw a hammer at it...!

If you know the Psu is the problem why throw it out ? Also maybe wait or Pm budm to help you debug the circuit.

[djsmasm]

first of all, my apologies if such a problem has already been discussed....!

now the explaination of the thread title!

the first time I plugged the set, relays were continuously clicking in a loop, synced with backlight trying to start....

so I've decided to change 3 ICs in power supply, but because I couldn't buy all of them from the same seller, the third one only arrived today, so I changed both the 2 others before, and it didn't solve anything!

now that I've changed the third, (the one for the PFC, SRX2039) relays don't click anymore but the STRZ 4479 doesn't work anymore either, so at least the inverters are not powered, but voltages produced by STRW6765 are fine........

I do have the service manual but it's almost useless because some of the voltages when everything is working aren't known!

I have 320Vdc instead of 370 on the big 450V capacitor (and thus less than the 5.1V I should have on FB pin of 2039), don't know if problem comes from that.

5V standby is fine, but 25V standby is "only" 22V (with the "new" 2039)

this voltage, when it's 25V, is used to produce 22V which goes to the 4479, but I only have 10V on its VCC pin

I've put back the original 2039, and everything is back to start (25V standby, 22V on 4479 VCC pin and 24V for inverters are back)!

I guess both of the 2039 are faulty, each one in its own way!

inverters have already been changed so I really doubt they're faulty

only once, the set had worked for a few seconds and fortunately, I had it plugged on a power meter, which had displayed 250W so at least that had been right!

to sum up, all voltages (but still with 320 instead of 370V) are fine and relays don't click only when backlight "ON" command is not connected....!

thanks for reading me.....!

and please correct me if my English isn't good enough....lol