Emerson LF401EM5

[citywidetvtech]

Was making a chirping beeping sound when trying to power on. AMP+13V Line shorted to ground. C3637 just below the black ribbon connector on main board is shorted.

BA4GU5G0201 3 main board.

[capwizard]

Re: Emerson LF401EM5

I think is the same problem to this TV

Emerson TV Buzzing-Won't turn on LF391EM4F post#28

Good news for your 5 Emerson TVs and Mother Earth! .....Will cost you almost nothing to repair!

After I removed Amp IC and two down-converters IC3605 & IC3604. Mother board still has short. So, I cut two traces of PCB to isolate the problem. found the low resistance 8.4ohm was caused by..................A SMD cap 4.7uf C3637...................I put all the parts back, but omitting the C3637 cap. The Emerson TV works beautifully.


Emerson TV Buzzing-Won't turn on LF391EM4F
[Tech Tips] Simply remove the SMD cap C3637 4.7uf.

[citywidetvtech]

Re: Emerson LF401EM5

I thought about leaving it out but replaced it with similar cap, did you find a schematic for this main?

[capwizard]

Re: Emerson LF401EM5

After you've removed the c3637 still not work?
you can replace with two 4.7uf porolize capacitors, + to - and - to + became A non polarized capacitor.

Similar to this schematic diagram, 39ME313V_F7 , then Ctrl Find C3637.

[citywidetvtech]

Re: Emerson LF401EM5

No I found one to replace it with, I was just curious if it would work without the cap present. Thanks for the link.

[capwizard]

Re: Emerson LF401EM5

Yes, I gave back to customer already. Can you believe 2014 mode still in factory box.
I knew it, was a cheap TV set, so $90 out of door(no parts used so no tax only charge labor),and customer got this TV free, anyway. I will let you know if he came back, threw the TV at my window.
It is hard to believe, took out A SMD cap, then TV work!

[citywidetvtech]

Re: Emerson LF401EM5

I know what you mean, its hard to charge a reasonable amount when ordering new boards, I'm really glad this fix was a simple one because most customers won't put $120 into a $249 TV, and I cant comfortably sell one with warranty knowing that the LEDs will certainly go out at some point. Can't wait to see what the EM6 main boards from emerson have in store for us.

[capwizard]

Re: Emerson LF401EM5

IC3605 RT8293ALZSP is a +1.26v regulator and pin 2 is Vin from Amp+13v . C3626 0.01uf C3601 0.1uf C3637 4.7uf are for noise reduction and source voltage stabilizer,

c3639 and c3607 both are 4.7uf (in the circuit really don't need two of them.) maybe borrow one to replace c3637.

This TV set was rejected by other shop.(not 2014 is 2015 model) This repeat customer appreciated and sharked my hand for fast service.

[capwizard]

Re: Emerson LF401EM5

I hope this will help you.

Emerson tv has no standby 3.3v, but flex cable from power supply has 3.3v (pin 8 AL+3.3V).
cn3601 pin 8 is 3.5 ohm then Trace to IC3601 AP1117EG-13(+2.5v REG) pin 2 is 0.2 ohm(shorted to MSD8200DS-S1).
Took out processor IC3001 then everything's Okay. Need to order MSD8200DS-S1 .