Sharp DV-6303S

[Wojtek_25_lat]

Good morning!
My name is Albert. I from Poland. I have problem with my tv Sharp model DV-6303S. First situation: I take out high voltage transformer (screen, focus, hv 1182.5024=HR6475), and connect 60Watt bulb between +153V and collector of 2SD1546. When tv is stand-by, and then, when I press button to switch on, the light is on, on 60Watt bulb. I see light on 60Watt bulb, every thing is ok, and no pictures of course, only characteristic sound-15,625 kHz.
Second situation: I put in that transformer of high voltage. I connect collector of 2SD1546 with returning +153V from transformer of high voltage. Then I switch on the tv. When tv is stand-by everything is ok. This is last situation when tv is working. When I press button to switch on television, I hear horrible sound. Maybe 1 second. The tv destroy 2 transistor-2SD1546, TEA 2261, and fuse 2A. Potentiometer R716 is suspicion. I look at him, and I see that he is breaks. That potentiometer is regulation od TEA 5170. And next, TEA 5170 is regulation TEA 2261 witch regulation 2SD1546, witch safe that fuse 2A.
Please tell me, what is wrong with my television, and tell me please, how many Ohms, of that R716(47k) potentiometer I need to regulation???My English is not good, but I think You understand me.
With kind regards.
Wojciech jacyk

 

[EM2-Gott]

Hello,

if you need the Service-Manual, show your email-account...

 

[Wojtek_25_lat]

Hello em2-gott
My e-mail: <a href="mailto:**********">**********</a>
Thank You for any helpfull information

Bye

 

[EM2-Gott]

the manual is on the way...

 

[oscillator909]

Hello,

may be the high voltage transformer (DST) is broken - have a internal shortcut.

Do you have control the impulses on the 2SD1546 at the basis ? is it clear ?

greetings

 

[Wojtek_25_lat]

Hello everyone
I can not check the impulses of the 2SD1546 because I have not oscilloscope. I exchange electrolitic capacitors. FBT is new. It is 1182.5024=HR6475 When I take him out and connect 60Watt bulb between +153V and collector of 2SD1546 I can normal switch on the tv. I see light on 60Watt bulb, every thing is ok, then I know the 2SD1546 working good. "Wrong" impulses will destroy this transistor but 2SD1546 with 60Watt bulb is normal working. Problem is in this situation, when I put in FBT to tv. I still try understand what TEA5170 is "do". He needs two control impulses. First from FBT from pin 12 to pins 5 and 6 of TEA5170. Second control impulse from +150V from adjust R716. My potentiometer R716 is damage (trouble). I see on him two breaks. I do not know how is he working. Maybe good, maybe wrong. First I would like to buy new potentiometer 47k and adjust him, but I do not know, how many Ohms adjust on him. Maybe then, when I press button to start tv, he switch on normal. Well, I have not any idea, what to do next.
Thank You for co-operate. With kind regards Wojciech J.

 

[EM2-Gott]

Was the FBT really broken? May be, the deflection coil has a internal shortcut...???

 

[Wojtek_25_lat]

Hello :wink:
One question:
R716- how many Ohms adjust on him? R716 is 47 kilo Ohms potentiometer. I
do not see "mark" on him by producent, when he adjust him. :?
Bye