sceptre x420bv-f120 lcd tv wont power on

[shelby5041]

got this tv for free....wouldnt pwr on.....when pwr button ht....the front light blinks red fast......

i took apart saw 3 caps bulged 330uf...1000uf and 220uf

replaced with good panasonic fr digkey....still no pwr...red light just blnks when hit pwr button

i do get 5v standby...actually 4.97v

no other voltages....this bd has a pwr on pin....should i try jumping it with 5v?

any ideas?

thank you

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

here are some pics ..

i figured it was a ps issue since it had 3 bad caps....but that didnt change when i replaced them...so not sure now...cant believe it would be a main board issue in addition to the ps issue with the bad caps i replaced....but im hoping someone can assist me here

thank you

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

not sure why pics are so blurry will try again

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

hope this is better

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

i get 5v at the 5VS pin only..i do not get 5v at the other 5v pins

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

well i thought esr meters check caps in circuit accurately..apparently i was wrong..they dont...even though the other caps looked good and tested good in circuit i removed them all and found out there were 2 more bad ones...located in center of board ..33uf....220uf...both are right next to each other...right next to Q201....i repl the 220 but have to order the 33.....maybe this will fix the ps issue......maybe these are startup caps?.....im hoping they are imporyant and will fix tv....

[budm]

Re: sceptre x420bv-f120 lcd tv wont power on

What do you get at the power on pin?
BTW, we need better pictures.

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

didnt check......should i check when hitting power button?.....right now when i hit power button the red led on front just blinks fast.....and like i said there is a bad 33uf cap i have to order

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

i know my phone camera has been taking poor grainy pics recently

[budm]

Re: sceptre x420bv-f120 lcd tv wont power on

Check when TV is off and when power switch is activated.

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

ok but before i do more test

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

ok ill do it after i get new caps..few days..thanks

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

one question....i know with caps u can go higher in voltage but whay about capacitance?....

i need a 33uf but have a 47uf......can i use a 47uf n place?.....my guess is no.

dont want to wait 4days to get a 33uf delivrred unless i have to

[vinceroger69]

Re: sceptre x420bv-f120 lcd tv wont power on

for testing i would use it (but thats me) but replace it asap with the correct one.

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

testing would be fne as long as it wont damage tv.....

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

so if i use 47uf to replace bad 33uf it would function for testing puroses and not damage tv?

[vinceroger69]

Re: sceptre x420bv-f120 lcd tv wont power on

i personally dont think it would hurt im sure tom/budm maybe along to advise too.

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

ok..im going to order 33uf...anyways....can anyone gve me a list of common failure caps

[shelby5041]

Re: sceptre x420bv-f120 lcd tv wont power on

i have these


47uf
220
330
470
680
820
1000
1200
3300

what others?......i want to order ones i dont have

[budm]

Re: sceptre x420bv-f120 lcd tv wont power on

Use 47uF for testing will be fine.