Re: Sharp LC-47SB57UT
Resolved.....was a bad cable connection after all
acuser
Member
Last Activity: 11-25-2021, 05:09 PM
Joined: 11-15-2012
Location: seminole, ok
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Sharp LC-47SB57UT
Hi
Ive had this tv for several years. I had to have a vhf antenna to pick up one local station(koco channel 5 OKC). It has worked great up until about two weeks ago, sometimes I couldnt get channel 5, now I cant receive it at all. I can hook up a digital convertor box I have from another tv and can receive channel 5 so I thiink the antenna and cable is ok. Do you think this would be the tuner board or possibly something else? Any ideas where I should start?
Thanks for any help
ps If I understood what I read correctly channel 13 in OKC is also vhf and I am... -
Re: p50 hdtv20a
Hey guys thought I would post update. Replaced the voltage regulator at U33
Set works great. I could not have done it without everyones help here.
Great forum....Thanks guysLeave a comment:
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Re: help find correct regulator
Im not sure what adjustable variant means, do think this one would work?
NATIONAL SEMICONDUCTOR - LM1117MP-ADJ - IC, ADJ LDO REG, 1.25V TO 13.8V SOT223-3Leave a comment:
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help find correct regulator
this a regulator(u33) on a vizio p50 hdtv20a main board 3850-0142-0150(2a)
AMC1117
F0745F
not 100% on that last F but it sure looks like it.
would a lm1117 work if so which voltage?
I cant find any info about the F0745f meaning, maybe 5F means 5 volt
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Re: p50 hdtv20a
I retested the four suspect regulators and got the same readings. I think this is the confirmation I was looking for.
I'm not sure I have the skill to replace such small components, so i think I will just order the board.
I will post back the results after receiving the board.
Thanks for all the helpLeave a comment:
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Re: p50 hdtv20a
u3 az7805t 12.13 0 5.05
u4 amc1117 f0745 4.6 3.3 2.05
u2 " '' 4.6 3.27 2.03
u8 5.07 3.31 2.06
u33 4.6 2.05 1.27
u7 2.05 1.01 .02
u9 k117s15 737 2.05 1.18 0
u35 amc1117 f045 4.6 3.28 2.04
u10 1084 01717dl 4.59 1.34
this is one with just 2 pins center one cut off
Its not pretty...Leave a comment:
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Re: p50 hdtv20a
do you want those to be checked from each pin to ground? or from the center pin to the outside pins?
I have all the numbers from each pin to ground but wasnt sure if that was what you wanted.
Thanks for your helpLeave a comment:
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Re: p50 hdtv20a
I found 2 of what I recognize as regulators. One has three legs which checked from center to one side at 12v and center to the other side at 5v. the other regulator had three legs but the center one was cut off it checked 3.3v. Im not sure the two legged one is regulator although it looks like one without the heat sink.
The only thing that looked like fuses were small white rectangles with copper or brass caps on the ends, these checked out ok. There were also three of these on main board that checked ok also.
Sorry for my lack of knowledge....Leave a comment:
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Re: p50 hdtv20a
Could any one confirm IamCanadian's diagnosis before I buy the board.
Thanks...Leave a comment:
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Re: p50 hdtv20a
anyone care to confirm IamCandian's diagnosis?Leave a comment:
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Re: p50 hdtv20a
ok Thank you very much for your help.Leave a comment:
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Re: p50 hdtv20a
didnt even notice that before there is a very faint glowLeave a comment:
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Re: p50 hdtv20a
dont see any bulging or leaking capsLeave a comment:
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Re: p50 hdtv20a
power on for about 5 mins the vs va vt still have same voltageLeave a comment:
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Re: p50 hdtv20a
OK checked all pins I could find. Are their others?
vs=209.1
va=63.2
a12v=12.15
vamp=23.9
vt=32.8
d5v=5.15
d3v3=3.5Leave a comment:
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Re: p50 hdtv20a
I took about 20 different pics these were the best ones.
yes I have a meter...Leave a comment:
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p50 hdtv20a
Vizio p50 hdtv20a
No picture
No sound
plug in set amber light is on
push power button light turns green and stays on
Here is a little difference from what ive found in my searches, when I try
to turn set off with power button it just stays green. The only way I can turn off is to pull plug.
Normally it looks like the likely problem is y sus and buffer boards, but Im hopeful
with the set not powering off it could be the main board(0171-2272-2302)
Appreciate any help
ps. I have pushed the...
No activity results to display
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