Question about Sanyo HT32744 32" TV

1 Answer

Sanyo DS31650 31

As a science and tech nut decided to take on the tv for learning experience.my problem and what i have done.. 1-typical power-on seconds later HV shutdown 2-replaced Horiz Out Transistor 3-it worked!,but, width became wavy and HV shutdown after 45 sec.Had trouble adjusting white balance. 4-replaced flyback transformer. improved white balance, still shutting down 5-voltage checks in multiple points on board seem to all be around 2x listed rating of said points. suggestions?????

Posted by mchase on

Ad

1 Answer

Mike Longo

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 398 Answers

If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).

Posted on Aug 18, 2007

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Picture looks dark


I have same model. First set went out of convergence, and I was able to adjust it. A few days later I had same problem and fixed it again. Then I was no longer able to adjust it. I watched TV the way it was. The picture got darker.Then I was watching TV, and there was a flash from the middle of the picture, and TV powered itself off. I unplugged TV and plugged it in 30 seconds later. I powered TV on, and red LED on front panel blinked a few times, and stopped. TV powered itself off.

From what I learned, the LAMP has to be replaced, and so do the convergence chips and convergence resistors. The TV shop charges around $300 and up just for the convergence chips. The TV is selling on craigs list for $150 to $200 in good working condition.

You have to decide if the repairs are worth your while. Probably not in mmost cases.

Sep 24, 2012 | Hitachi 50GX30B 50". Rear Projection...

2 Answers

Lamp modules on tv wont last


Richard,
Could be a bad spark gap on the ballast board. Should have a tech come in a do some Hv testing to see whether the ballast should be replaced, could make the difference on getting the lamp to last 1000 hrs or 3000 hrs...
Bill

Jan 04, 2009 | Televison & Video

1 Answer

KP-57WS500 8 blinks will not power on


8 blink error code is usually indicating that the HV transformer ( Flyback) is faulty on the D board. You can get a replacement flyback at the following link with free tech support to explain how to replace it. Heres a link to the correct Flyback for the KP51-65WS500 model sonys.
http://servicemanuals.vstore.ca/product_info.php/pName/sony-flyback-145328541/cName/flybacks

Jan 04, 2009 | Televison & Video

1 Answer

My 4 year old Magnavox 51" rear proj TV cycles ON/OFF every 5 sec


Hello bcd74071,

I would suspect that the shutdown circuit is triggering. Have you checked the HV anodes of the CRTs to see if the voltage is fluctuating? In addition I would check the Horizontal output transistor and the Power FET in the switching power supply. The fact that you removed the blue CRT and put it back and the problem seemed to go away points to a possible cold solder joint which could have this effect also. There are a number of things that could be wrong, Here is a list of some of them that you can check:

1) Faulty component on power supply board (check capacitors for problems)
2) Faulty connection on power supply board (check for cold solder joints)
3) Faulty component on Deflection of HV power supply board (check for bad capacitors, zener diodes, Horizontal Output Transistor, and Integrated High Voltage Ttransformer)
4) Faulty connection on HV power supply board (check for cold solder joints)
5) Faulty CRTs (check anode voltages, remove anodes from CRTs and see if the set remains on, if so check for shorts on the CRT socket board or using a CRT analyzer check for internal CRT shorts)

These items are but a starting place for you.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Dec 01, 2008 | Philips Magnavox 51MP392H Rear Projection...

2 Answers

It won't power up


You need the HV splitter. You can leave a email at the following link state your model number and let them know you need a HV splitter. They will respond quickly to your inquirery and they will provide free tech support to explain how to change the part.
http://servicemanuals.vstore.ca/

Jul 01, 2008 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

Tv won't stay on


2 of 3 circuit boards in your Mits can give your symptom...

1)Center power supply board = open fuse & bad IC's

2)HV scan board defective.....

A qualified Mits tech with parts in stock can fix it.......T.

Dec 13, 2007 | Mitsubishi WT-42311 42" Rear Projection...

1 Answer

T.V. won't turn on


PCB repair should be done by a qualified tech. Your problem could be HV cap bad,xformer defective or bad connection problems and pico fuse open. Check 2KV cap near xformer.

Sep 26, 2007 | Sony KP-51WS520 51" Rear Projection...

1 Answer

Power not working


the tv needs to be repaired take it to a tech the power supply is the culprit along with the related circuit.your tv must be repaired by a proffessionl tech good luck.

Apr 03, 2007 | RCA P52771AT 52" Rear Projection...

2 Answers

Turn off 5-6 seconds after I turn on tv


Typical relay power problem on these sets for the relay power. most of the time, its the capacitor in the standby power supply that supplys the main 12 to 15 volts to the relay for the main power supply.. Problem is it is not a repair that can be done or understod by a layman in electronics. its a repair for an experienced tech as a TV set is not a place to be experimenting in.

Sep 10, 2006 | Philips TR2503C 25" TV

Not finding what you are looking for?
Sanyo HT32744 32" TV Logo

216 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sanyo Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76407 Answers

 Grubhead
Grubhead

Level 3 Expert

5700 Answers

matt martin
matt martin

Level 3 Expert

1258 Answers

Are you a Sanyo Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...