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#81 |
Badcaps Veteran
Join Date: May 2012
City & State: mackay
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Line Voltage: 240
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#82 |
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Join Date: Aug 2013
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#83 |
Badcaps Veteran
Join Date: May 2012
City & State: mackay
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![]() Did the PCB get burnt under Q444?
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#84 |
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#85 |
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#86 |
Badcaps Veteran
Join Date: May 2012
City & State: mackay
My Country: australia
Line Voltage: 240
I'm a: Hobbyist Tech
Posts: 893
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#87 |
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#88 |
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![]() Hi.. i replace the 2sa684(q444) with a92 now problem soleved ther is no leakage current. I think 2sa684 for not suitable for this apllication as the maximum volatage on Vceo is 50 but in this circuit its 54volt i think thats why this leakage current but for a92 Vceo is 300 volt.any way thanks alot for your support i apriciate it..may be tomorrow i will get correct tramsistors ie. A992..then i wil replace it
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#89 |
Badcaps Veteran
Join Date: May 2012
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![]() The 2SA684 would not have had any leakage and there was no indication that Q443 was leaky. If the PCB was charred, you should confirm it. I like things to make complete sense where possible.
It is best to use the correct transistors. Last edited by rievax_60; 09-15-2017 at 07:01 AM.. |
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#90 |
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![]() Yes i done cleaning and same time i replaced transistor also ..i think you are right may be black mark cause leakage ..but any way i will replace with correct transitor tomorrow.because if i put back 2sa684 for testinfg freequent removal causing traces damage..
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#91 |
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Join Date: Aug 2013
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![]() Today i got onkyo sr 313 and pioneer vsx 1122 both are ahutdown itself after power ..i will open another thread for discission..
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#92 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
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Line Voltage: 120V 60Hz
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![]() What Voltage do you have at the Base of Q437 compared to working channels?
What are the Voltages at the Collector of Q443, 444 compared to working channels?
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Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 Last edited by budm; 09-15-2017 at 10:30 PM.. |
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#93 |
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![]() At base of q437 was around 49 volt with respect to ground.and cillector pin of q443 444 is -53volt .its almost same comoared to other channel..
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#94 |
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![]() So those Voltage readings on all those 3 location as I request show about (within 1V) the same as in the working channels. There must be some readings in that section that is/are not the same as working channels.
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#95 |
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![]() Yes that is at base of q443 q444 and at the emitter tied
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