[TechAssist] Re: (update)Bear of a Sanyo DS35590 HOT shorts at plug in
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 19 Jan 2005 21:50:33 -0500
Take a look at this....from the DS31590...typical disaster
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Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
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SANYO DS31590
Dead, After Surge
Q402 Hot Shorted - D1879
D612 Opto-Isolator Open - Pc817
Q635 - Control Or Driver For Opto C536 Sub Nte 85 Shorted
Q695 - " " A608 Sub Nte 290a Shorted
Q693 - " " C536 Sub Nte 85 Shorted
Ic681 - 5v Regulator Ic 78l05 Shorted
D1901 - 7.5v Zener (Protect Diode I'M Guessing For 5v Protection) Leaking.
Note: When Replacing Hot I Strongly Recommend Testing For Regulation Before
Powering Set Or The B+ Will Shoot To Over 200v And Destroy Any Hot. This Can
Be Done Simply By Leaving The Hot Out Of Circuit And Hooking 40 To 100w
Light Bulb From Collector To Gnd And Plugging Set In Without Turning On And
Check B+ For 75 To 80v. Then You May Power Set Up If It Will And Check B+
For 130v.
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==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@xxxxxxxx
========================
----- Original Message -----
From: "Terry J Hutchison" <sony1@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 19, 2005 5:38 PM
Subject: [TechAssist] Re: (update)Bear of a Sanyo DS35590 HOT shorts at plug
in
>I put the unit on my variac with HOT removed. With input AC set to only
> 25vac I have 177vdc on collector pad of HOT and pins 1,2 and 4 of IHVT. I
> desoldered all 3 of these pins from IHVT and voltage is still running
> away.
> When variac voltage is raised above 325vac relay throws and I know that is
> wrong. Starting to go in circles any helps appreciated. Thanks Terry
>
> Terry J Hutchison
> T&G TV Repair
> Kingsland GA.
> sony1@xxxxxxxx
>
>
>> [Original Message]
>> From: markbrock <markbrock@xxxxxxxxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Date: 1/19/05 9:01:40 AM
>> Subject: [TechAssist] Re: Bear of a Sanyo DS35590 HOT shorts at plug in
>>
>> ring the fly
>> brock
>>
>> Brock Electronics
>> R.R.4 box 237
>> 5208 cr.3385
>> Independence Ks. 67301
>> 620-331-0235
>> fax 331-7191
>>
>> markbrock@xxxxxxxxxxxxx
>> Zenith*Philips*Peavey*Fender*Crate
>> we work on all brands,makes,models
>> of anything that plugs in the wall
>> ----- Original Message -----
>> From: "Terry J Hutchison" <sony1@xxxxxxxx>
>> To: "techassist" <techassist@xxxxxxxxxxxxx>
>> Sent: Tuesday, January 18, 2005 9:22 PM
>> Subject: [TechAssist] Bear of a Sanyo DS35590 HOT shorts at plug in
>>
>>
>> > Set came in dead(lightning) I have done this repair a couple of times
> and
>> posted it to this forum, my personal data base crashed and I have had to
>> start over. I found the usual Q601 short, Q604 short, also found D603
>> short, Q635 open, the HOT Q403 was good. After replacing these along
>> with
>> the coupler I pluged in set to check secondary voltages, oopps. At plug
>> in
>> relay throws and HOT instantly shorts, all components replaced in primary
>> still check good. I began to do cold checks on the secondary and found
> the
>> following diodes with low ohmage readings in circuit D489(in other sets
> this
>> was D1901 I think), D311 and D312 these all check normal when removed
>> from
>> chasis in chasis reading between 150 to 250 ohms.
>> > I checked all the diodes in the area of the IHVT and they check good
> in
>> circuit. Sure could use a helping hand here. Thanks Terry
>> >
>> > Terry J Hutchison
>> > T&G Television Repair
>> > Kingsland, Ga.
>> > sony1@xxxxxxxx
>> > Why Wait? Move to EarthLink.
>> >
>> >
>> >
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