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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
LG CRT TV turns off after few seconds + White horizontal lines

 
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madhushankarox
New User


Nov 22, 2013, 8:02 AM

Post #26 of 36 (1640 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
I tried resetting.. But the issue is.. Brightness is not responding to settings.. I can see the settings are increased. But the brightness is not changing.

Can you please let me know the voltages trough IC 894 and IC2?

From where I can get the diagram of this?

Thanks!



I've replaced new TDA6107 with old one new voltages are,

2.4v; 2.4v; 2.4v; 0.8v; 0v; 187.6v; 108.3v; 107.6v; 100.2v


(This post was edited by madhushankarox on Nov 22, 2013, 8:32 AM)


jts1957
Veteran


Nov 22, 2013, 10:26 AM

Post #27 of 36 (1632 views)
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Re: [madhushankarox] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
IC2
Pin #1 3.3V
Pin #2 Gnd
Pin #3 5V

NO IC894

http://www.electronica-pt.com/...c,startdown/id,1144/

Any change in screen symptom with new IC?


-------------------------
Location: Far, Far Away

(This post was edited by jts1957 on Nov 22, 2013, 10:28 AM)


madhushankarox
New User


Nov 22, 2013, 1:26 PM

Post #28 of 36 (1629 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
All of the above screens with the new IC but I decided to use the old original one. I don't see any noticeable different on the screen. But the pin voltages are different.

Thank you very much for the link and your reply. I really appreciate

IC 844 not 894. sorry for the mistake ;)


IC02 voltages are okay.. Hmm I don't know what the heck is this :(


(This post was edited by madhushankarox on Nov 22, 2013, 2:09 PM)


jts1957
Veteran


Nov 22, 2013, 2:07 PM

Post #29 of 36 (1624 views)
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Re: [madhushankarox] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
IC844 IN Pin 1 = 9.5V OUT Pin 2 = 8V


-------------------------
Location: Far, Far Away


madhushankarox
New User


Nov 22, 2013, 2:17 PM

Post #30 of 36 (1621 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
This one also right. But not static.

Flyback voltages.. 117v for 185v, 0v for -14v and 14v..



(This post was edited by madhushankarox on Nov 22, 2013, 2:17 PM)


jts1957
Veteran


Nov 22, 2013, 2:53 PM

Post #31 of 36 (1616 views)
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Re: [madhushankarox] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
-14V across C443 / 14V across C446?


-------------------------
Location: Far, Far Away


madhushankarox
New User


Nov 22, 2013, 3:06 PM

Post #32 of 36 (1613 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
That's also right Crazy


jts1957
Veteran


Nov 22, 2013, 3:49 PM

Post #33 of 36 (1609 views)
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Re: [madhushankarox] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
Quote
Flyback voltages.. 117v for 185v, 0v for -14v and 14v..
-14V across C443 / 14V across C446
Quote
That's also right
SAME POINTS! Can't have it both ways!Shocked


-------------------------
Location: Far, Far Away


madhushankarox
New User


Nov 24, 2013, 2:51 AM

Post #34 of 36 (1592 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
In Reply To
Quote
Flyback voltages.. 117v for 185v, 0v for -14v and 14v..
-14V across C443 / 14V across C446
Quote
That's also right
SAME POINTS! Can't have it both ways!Shocked


What do you mean?


jts1957
Veteran


Nov 24, 2013, 3:47 AM

Post #35 of 36 (1588 views)
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Re: [madhushankarox] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
Quote
Flyback voltages.. 117v for 185v, 0v for -14v and 14v..
Here, you state you DO NOT have + & - 14 volts.

When I asked if you had -14V across C443 / 14V across C446 you replied
Quote
That's also right
 which I interpreted as you DO have them.

You can't have AND not have them at the same time.
(Unless you think you can measure DC Volts somehow on the flyback pins themselves.)


-------------------------
Location: Far, Far Away


madhushankarox
New User


Nov 24, 2013, 4:39 AM

Post #36 of 36 (1587 views)
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Re: [jts1957] LG CRT TV turns off after few seconds + White horizontal lines [In reply to] Can't Post
Ya. I was measuring with GND. May be I was stupid but actually I didn't know about that before you tell. I'm not an expert like you Smile

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