Philips 42PF7320A/37 powers on but no video/picture

[jose6326]

so i picked this up last night
this thing is a monster compared to tv's now

i plug it in you can hear the relays clicking and the green power led comes on
i push the power button on you hear more clicks from the relay then it powers off and the red standby led comes on in the front and blinks 7 times


so i remove the rear cover and i was like "wtf!" after i seen how big the psu is and all the wiring. it was like capacitor city in there. i thought to myself what did i get myself into this should be fun.

i noticed this is a Samsung tv since every board and the panel has a Samsung label on it

anyways so first thing i look for any bulging/leaking caps
after 20 minutes of searching i finally found 1 blown cap on the ymain board
i was like cool this should fix the problem but of course it did not.
i replaced the cap reinstalled the ymain and still no video
tv still has same issue

green led in front comes on
green leds on logic borad come on then off
another green led on a tiny board blinks 3 times

i checked all 8 fuses (wtf moment) on the ymain
all fuses on ymain are good

checked all 5 fuses on psu then found 4 more (another wtf moment)
wasnt able to check all fuses on psu because the other 4 are surface mount and i need to take the board out

so now i moved on to check voltages
but before i check i decided to unplug the connector to the ymain since that is where i found the blown cap

after i unplugged ymain i plugged power back on and now the psu stays on
you can hear the transformer on leds stay on
so im guessing all the fuses are good on psu?

i am guessing there might be a defective component on the ymain or y buffer boards?

here are the voltages after i disconnected the ymain

Va:70.3
Vsc: -190.1
Vs: 203
Ve: 84.1
Vset: 194.7
D5V: 5.2
Vg: 15.06
+12v: 12.19
Vtun: 87.3 and drops
5V2: 5.19
5v_Sw: 5.16
8v6: 8.72


i guess i have to check the mosfets on the yamin
any other suggestions?

[jose6326]

Re: Philips 42PF7320A/37 powers on but no video/picture

here are pics of the test points and ymain board

i also came across this chart on the psu
it is marked "alarm sig"

[jose6326]

Re: Philips 42PF7320A/37 powers on but no video/picture

should i replace all the caps on the ymain and psu?

this is a pretty old model from 2005

[tom66]

Re: Philips 42PF7320A/37 powers on but no video/picture

I'd replace that cap on the Y-main. The Y-main rarely fails on these, it's usually the buffer, so try without that. However, the bad cap may have caused Y-main fault.

[jose6326]

Re: Philips 42PF7320A/37 powers on but no video/picture

i did replace the cap
it still had the same problem

if i disconnect the buffer connector from the psu do you think the panel will turn on?

or should i separate the buffer board from ymain then power it on?

[tom66]

Re: Philips 42PF7320A/37 powers on but no video/picture

I wouldn't expect any light from the TV with the buffer removed.
Unless it has two buffers in which case one or the other may be removed.

[jose6326]

Re: Philips 42PF7320A/37 powers on but no video/picture

it does have 2 buffers

should i only remove one and power it on to see what happens?

[tom66]

Re: Philips 42PF7320A/37 powers on but no video/picture

Yeah, try that.
The buffer must be completely removed from the set and disconnected from the other buffer.

[cwilson1584]

Re: Philips 42PF7320A/37 powers on but no video/picture

I Picked Up A TV Off A Friend And He Was Throwing It Away Because It Was Not Working. I Took It Hoping I Could Fix It Because One Of My Family Members Stole My New Led Smart TV And Sold It And I Have Lost My Job And Have No Income At The Moment. I Could Really Use The Help To Fix This. At First I Couldn't Get The TV To Turn On. I Find A Couple Of Capacitors That Looked Bad And Changed Them But I Don't Think That Was The Issue. When I Would Plug The TV In I Couldn't Hear Any Relays Click Or Anything. It Did Nothing But Blink The Led On The Bottom Left Corner Red,Green,Red,Green Etc.. The Green Led On The Inside Main Power Supply Board Was On Also. After Changing The Capacitors I Was Connecting The TV Back Up To Test It Out And My Dumb Self Missed A PlugThat Leads From The Main power Board To The AV Connections On The Bottom Of The TV. I Plugged In The TV And The Relays Clicked And When I Pressed The Power button On The Remote The TV Came On With A Perfect Pictur Just No Sound. I Connected A DVD Player To It And It Played The DVD Perfect. after Having No Sound I looked Around To See If I Missed A Plug Or Something And Sure Enough I Found That Plug I Previously Mentioned. I Plugged It Back In And Immediately The TV Shut Down Into Protect Mode. So I Unplugged It Again And Sure Enough The TV Came Back To Life But Then After Messing With It A Couple Times Trying To Figure Out What That Plug Did The TV Now Will Only Click The Relays With No Picture Still No Sound And The Led On The Front Turns Green At First Like Normal But Then Starts Blinking Red three Times Fast And Then Five times Slow. I Know This is Allot And I'm Sorry. I'm In Such A Bad Spot And Need Help. Thank You For Your Time.