[TechAssist] Re: Orion TV2520A: pulled in on sides
- From: Gary McCartney <number63@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 27 May 2002 11:41:08 -0400
OK, I found some info in my saved emails. Hope some it it helps.
Gary
========================================================================
That 113v seems low to me. Emerson/Orions are real good at using
STR30110
(110v Regulators) and biasing them to put out 128V. Something to do with
the
Base Circuit configuration. If it uses this type of Linear Regulator,
check
the resistors around it, especially the 47ohm one.
-----Original Message-----
From: maintv <maintv@xxxxxxxxxxxxx>
To: servicetalk@xxxxxxxxxxxxxxxxxxx <servicetalk@xxxxxxxxxxxxxxxxxxx>
Date: Wednesday, July 14, 1999 4:24 PM
Subject: Re: [SERVICETALK] Emerson MS2580RDA - ongoing saga
>
>
>Greg Biltcliffe wrote:
>
>> Cust complaint was "dead set - tic tic tic"
>>
>> I replaced open R518 (5.6 ohm 7W supplies B+ to fbt),
>> shorted Q401 (2SD1555 H.O.T.), and
>> open C435 (1uF 160V 'lytic on B+ side of H drive transformer),
>> resoldered T401 (H drive transformer), and hit the power button.
>>
>> Set powered up, and picture looks good. H.O.T. seems to be running
>> cool enough, but during occasional scenes, or with no antenna
>> connection, the raster does not quite fill out the screen fully left
>> to right. Kind of looks like B+ is low. I get 113VDC feeding to the
>> fbt, but is it supposed to be more? Any pointers?
>> As usual, TIA!
>> Greg's Electronics
==============================================================================
This tip is for: EMERSON TV T2555DA
Problem: No Sound Or Picture, Just Clicks
Info: Sam
Fix: Change Q401 (d1556), Ic501 (str30110), C435 (1mfd@160v) And R521
(4.7r3w) - Also Check For Burnt Connects In Horiz Defl & Regu Area.
============================================================================
Date: Wed, 6 Dec 2000 09:39:22 EST
From: Lo1297@xxxxxxx
Subject: Sansui TV Model TVM1315A, repaired
Hello to all,
I thank all of you that responded to the turn off problem of the Sansui
TV
model TVM1315A, especially thanks to Joe @joetech, Ronnie @IEPlayer,
Tommy @tabnix and Richard @rickstv.
This is the Sansui tv that would turn off (via x-ray diode D402) uppon
turn
on.
I found that by reducing the line voltage the set would stay on. By
turning
up the ac voltage, causing the B+ and HV to increase the set would go
off at
a B+ of 128vdc (pin-4 or TP501 should be 137vdc), and as HV would reach
28kv
(should be 26kv) .
Since the B+ regulator was a STR30110 many thought the regulated
voltage at
IC501-4 should be 110vdc and therefore the regulator must be defective.
However in this application with Orion tv sets using STR30110 the output
regulated voltage should be and is 137vdc.
In this case capacitor C443, .0047@xxxxxx, located in the collector of
H.O.T.
Q401 would change with current flow and affect the output waveform.
Replacing
C443 corrected the turn off problem.
The proper voltage at IC501 and the H.V. output is as follows:
H.V. output is: 26kv
Regulator IC501 with line voltage set at 115vac :
1= Ground 4= 137vdc (TP501)
2= 134vdc 5= 6.5vdc
3= 180vdc
Hope this will help someone in the futher.
Have a nice day, God bless.
Herb from Farmington Hills, Mi.
=============================================================================
I've seen posts about that problem before, where a 110 V reg is supposed
to have more voltage than 110V on the output. If I remember corectly
there are some other resistors or diodes in the regulator circuit need
to be changed. I will search my saved messages and post them if I find
any info. Check to see if the ground pin on the regulator actually goes
directly to ground or perhaps through a bias resistor before ground.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63@xxxxxxxxxxxxx
Dave Routson wrote:
>
> Jeff, I believe you will need an orig oem regulator or equivelent to make
> it work right. Any time I've had a regulator that is controled by pin
> 5 it requires an oem part.
> Dave Routson
> Dave's TV
> Cleburne, Tx 76033
> 817-641-8465
> ----- Original Message -----
> From: <WJSTV@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, May 27, 2002 8:18 AM
> Subject: [TechAssist] Orion TV2520A: pulled in on sides
>
> >
> > We're using Orion service manual. TV came in dead. HOT was shorted, C446
> > (1@160v) in horizontal driver circuit was open, and R506 (180 ohm @ 20w)
> in
> > regulator was open. Then no vertical deflection. Changed vertical out
> ic401
> > (LA78041). Then had picture but no B+ regulation. STR30110 was shorted and
> > R515 (1.5@3w) was open. Changed those parts, but raster is pulled in on
> > sides, with B+ of only 110v. Schematic shows output of regulator is
> supposed
> > to be 135v (even though it's an STR30110). Pin 5 of STR is 0, but should
> be
> > 6.9v. We used the light bulb technique to eliminate the horizontal section
> > and regulated voltage didn't improve. Checked all resistors and caps in
> > regulator and tried another STR. Unfortunately, both STR's were purchased
> > from same place and have same #'s.
> >
> > Bad batch of STR's? Any suggestions appreciated.
> >
> > Jeff Smith
> > Smith TV Service
> > 1930 Main St
> > Newberry, SC 29108
> > 803/276-4946
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--
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63@xxxxxxxxxxxxx
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