[TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00 In General
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 06:43:23 -0500
As usual I am a day late and a dollar short.
Any brand or model TV that uses the switch mode supply to generate both
the main and stand-by supplies is subject to a ticking noise while in
stand-by. Why?
There are two ways to run the supply. It can run as a frequency
modulated supply or a pulse modulated supply. If it is a frequency
modulated supply it will run constantly, changing frequency to meet the
demands of the load.
However, if it is a pulse modulated supply the power supply is not
running all of the time. It will burst to "recharge" the secondary if
there is insufficient load to keep it running. This burst of energy
thru the circuitry can cause a ticking sound.
And how can you tell which supply you have? With a scope, of course.
So, if it is a soft/quite ticking I would not worry about it. Of
course, that is subjective.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
> ----- Original Message -----
> From: "John Conti" <contitv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, October 20, 2005 2:39 PM
> Subject: [TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00
>
>
>
>>Dan, I was just lucky to get this guy, that use to help at any time.
>
> First
>
>>thing he ask me was are you ASC., I kindly replied, No MR Richardt but In
>>the past you have always helped me with Dogs. And then when I gave him MY
>>name , HE Replied, OH yes I remember you, but we are not giving out this
>>info to ind. shops. But I will help you for this time. Whewww!!
>>
>>John
>>Conti,sTV
>>Texas
>>
>>>From: "Webster's TV" <webstertv@xxxxxxxx>
>>>Reply-To: techassist@xxxxxxxxxxxxx
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Subject: [TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00
>>>Date: Thu, 20 Oct 2005 14:21:23 -0500
>>>
>>>John,
>>>
>>>Thanks for the info! I've never seen a set that this was normal in, but
>
> if
>
>>>that 's what Sanyo says, we'll go with it. Like you say, most people
>>>probably won't notice the ticking unless it's real quiet. Thanks again
>
> for
>
>>>the research, it's going to save me alot of time looking for a problem
>
> that
>
>>>is normal in this unit!!
>>>
>>> Dan Webster
>>> Webster's TV
>>> Shullsburg, Wi.
>>>----- Original Message -----
>>>From: "John Conti" <contitv@xxxxxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Thursday, October 20, 2005 1:59 PM
>>>Subject: [TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00
>>>
>>>
>>>
>>>>Dan, I just spoke to sanyo about the tick tick tick and they said the
>>>
>>>for
>>>
>>>>that model and a few others
>>>>that is perfectly normal for that set to do that. It just may be
>>>
>>>annoying
>>>in
>>>
>>>>a very quiet room.
>>>>Hope that will save all of us a little time on that situation.
>>>>John
>>>>Conti,TV
>>>>Texas
>>>>
>>>>>From: "Webster's TV" <webstertv@xxxxxxxx>
>>>>>Reply-To: techassist@xxxxxxxxxxxxx
>>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>>Subject: [TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00
>>>>>Date: Thu, 20 Oct 2005 13:13:43 -0500
>>>>>
>>>>>John C.& John M,
>>>>>
>>>>>Thanks for the reply, both of you mentioned R617, but thats not the
>>>>>problem,
>>>>>it checks OK and I even tried a new resistor just in case it was
>>>
>>>breaking
>>>
>>>>>down, but same problem. Any other ideas?
>>>>>
>>>>> Dan Webster
>>>>> Webster's TV
>>>>> Shullsburg, Wi.
>>>>>
>>>>>----- Original Message -----
>>>>>From: "John Conti" <contitv@xxxxxxxxxxx>
>>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>>Sent: Thursday, October 20, 2005 10:24 AM
>>>>>Subject: [TechAssist] Re: Sanyo M# DS27930, Ch# 27930-00
>>>>>
>>>>>
>>>>>
>>>>>>Dan, check r617 may be open.
>>>>>>
>>>>>>JOHN
>>>>>>Conti,TV
>>>>>>Texas
>>>>>>
>>>>>>
>>>>>>
>>>>>>>From: "Webster's TV" <webstertv@xxxxxxxx>
>>>>>>>Reply-To: techassist@xxxxxxxxxxxxx
>>>>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>>>>Subject: [TechAssist] Sanyo M# DS27930, Ch# 27930-00
>>>>>>>Date: Thu, 20 Oct 2005 09:54:30 -0500
>>>>>>>
>>>>>>>Techs,
>>>>>>>This set came into shop with no vert. deflection, after replacing
>>>
>>>the
>>>
>>>>>vert.
>>>>>
>>>>>>>output IC, and a shorted diode and open resistor in the voltage
>>>
>>>supply
>>>
>>>>>to
>>>>>
>>>>>>>the chip, this solved the vert. problem. The set works perfect,
>>>
>>>until
>>>
>>>>>you
>>>>>
>>>>>>>shut the unit off, and then you can here a faint ticking
>>>>>>>noise(tick,tick,tick) coming from the power supply. I've checked
>>>>>>>transistors, etc. in the power supply, and also replaced a SCR in
>>>
>>>the
>>>
>>>>>power
>>>>>
>>>>>>>supply thinking that may be the cause, but no change. Anyone have
>>>
>>>any
>>>
>>>>>tips
>>>>>
>>>>>>>or sollutions to this ticking noise?
>>>>>>>
>>>>>>> Dan Webster
>>>>>>> Webster's TV
>>>>>>> Shullsburg, Wi.
>>>>>>
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