philips 55 oled 745 /12 3 blinks

[jimbofz]

i didnt check that when i had jumpers on ,i just checked the other plug for 12v and 24v which were good

i will reconnect jumpers as before and measure this voltage ,
it will be in the morning ,
thanks for all your help and advice so far

[jimbofz]

when i did the first test with jumpers ,i did not check the 24v voltage on the same socket ,but i did check the 12 and 24v on the other plug and it was correct.
i will check tomorrow the pins on the other sockets labelled+24-a

[jimbofz]

Originally Posted by Diah

when you did the first test with jumpers, did you have on the same socket 24V?
remember you wrote before it read 12 !!!

the pins on the sockets labeled +24V_A

good morning
i refitted the links as before and the +24_A voltage is 12.5v

[Diah]

Originally Posted by jimbofz

good morning
i refitted the links as before and the +24_A voltage is 12.5v

okay... you need to do 2 other test.
1- keep this test in place. slide out the 2 cable of +24V_A from the mainboards side .. then turn on.. see if it jump higher than 12.5V at PSU side

[jimbofz]

no
voltage stays 12.5v with two cables of +24_A removed

also no sby light but the other supplies 12v 24v still come up ok with no pic

[Diah]

Originally Posted by jimbofz

no
voltage stays 12.5v with two cables of +24_A removed

also no sby light but the other supplies 12v 24v still come up ok with no pic

you need to check your PSU. specially the 24V line MOSFET if they are for 24V or 12V. the print say 24V..

[jimbofz]

ok will do

[jimbofz]

the chassis type is tmp 19.6e and i managed to get cct for tmp18.1e
its similar.
the 12 and 24 v supplies are produced by the tx t9101,the components are all fine on the secondary of the tx.
on the primary we have a drive ic ssc 3s 927 this feeds vgh and vgl to two fets q9101 and q9102
with psu removed all components test good
the tx o/p pins 8 and 9 should produce 24v,
it only produces 12.5 v
the same tx pins 10 and 7 produces 12 v
and is good

the same winding on the primary pin 2 and 3 is used to feed the same 12v and 24v
so i dont know why the 24v should be low?

[Diah]

can you show focused high resolution photo on both side of the PSU. and remark on the photo the 24v_a pin

also did you checked after crack at the soldering !!

EDIT: i am afraid if the printing label wrong LOL but the 24V are very common range to supply audio section too .. other wise i will do this test.....>
you can try after you are sure its should be 24V. to put every things in place as original. and just slide the 2 wire of +24V_A from PSU socket. and test them with DM if they are both connected at mainboards so you can feed only one from the 24V of the panel 24V PIN and then turn on.. LOL

so the set should turn on with complete picture .... or it could jumping high to the moon... LOL so funny issue.

EDIT: Don't do this test

[jimbofz]

heres some pics of psu
i have soldered any joints that might have looked bad with magnifier
although the board still looks like new
with regards to the +24v_pins , they are joined together

[Diah]

one things more.. you wrote at your picture 24V_A read 12V at STB... so it mean it booted high to 24V after PSU turn on... same way to some of Philips PSU which they read 12V STB then goes high to 18V after turn on.. !!!! mysterious

[Diah]

it make no sense to me if +24V_A read 12V at STB as you stated.. can you recheck this point at yours photo https://www.badcaps.net/forum/attach...2&d=1613402078

[jimbofz]

i also think it makes no sense
ive reinstalled the psu as original state with all connections back to normal
and ive re checked the +24v and its 12.5 v in sby and 12.5 v when its blinking
ive tried with dm set to peak hold and it wont go above 12.5v

[Diah]

clean this section in the photo ... ist from you or some one play on PSU before you ?

[Diah]

Originally Posted by jimbofz

no
voltage stays 12.5v with two cables of +24_A removed
also no sby light but the other supplies 12v 24v still come up ok with no pic

leave this line +24V_A , because when you take them out no STB LED on the set... somethings wrong by label.

you need back to the last test to see if the panel damaged or not... you need to plug out the 2 LVDS cable between mainboards & T-CON ( from T-CON Side ) and do the jumpers test as you did first time.. to see if the panel still show lines or it light whole the screen... if its just line as before it shorted.. no need to spend time on this set.

[jimbofz]

ok will do the mark on board is a minor scratch nothing to worry about .
i will fit the links again and do the lvds foils one at a time and post the results

[Diah]

Originally Posted by jimbofz

ok will do the mark on board is a minor scratch nothing to worry about .
i will fit the links again and do the lvds foils one at a time and post the results

No. both Lvds must be disconnected together

[jimbofz]

ok will try tomorrow thanks

[budm]

Originally Posted by jimbofz

the chassis type is tmp 19.6e and i managed to get cct for tmp18.1e
its similar.
the 12 and 24 v supplies are produced by the tx t9101,the components are all fine on the secondary of the tx.
on the primary we have a drive ic ssc 3s 927 this feeds vgh and vgl to two fets q9101 and q9102
with psu removed all components test good
the tx o/p pins 8 and 9 should produce 24v,
it only produces 12.5 v
the same tx pins 10 and 7 produces 12 v
and is good

the same winding on the primary pin 2 and 3 is used to feed the same 12v and 24v
so i dont know why the 24v should be low?

Can you upload the chassis TMP18.1E schematic that you are using?

[Diah]

.