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#1 |
New Member
Join Date: Jun 2020
City & State: Beirut
My Country: Lebanon
I'm a: Knowledge Seeker
Posts: 4
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![]() Hello,
I am new to this forum and this is my first post. I was googling and found this forum with experts in Yamaha repairing. i would be thankful if someone could help to fix my receiver. When starting the self diagnostic mode it shows a dc_prt 255H message and shuts down after 5 secods. By checking the service manual downloaded from i found that the voltage at the power amplifier DC voltage is high. I have removed the cover to check for any burnouts or leakage bu didn't find any. I have all the tools to start checking and repairing but i need some guidance were to start. Any help would be appreciated!! |
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#2 |
Badcaps Veteran
Join Date: Jan 2012
City & State: Los Angeles/San Dimas, CA
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Knowledge Seeker
Posts: 3,446
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![]() Usually, I just go to the final transistors and measure for short.
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#3 |
New Member
Join Date: Jun 2020
City & State: Beirut
My Country: Lebanon
I'm a: Knowledge Seeker
Posts: 4
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![]() i couldn't find the final transistors i can only see the capacitors, resistors and relays at the outputs.
I got the service manual from manualslib.com/manual/1082963/Yamaha-Rx-V373.html |
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#4 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,117
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![]() Please upload good clear pictures using 'Go Advanced' so we can see what we are dealing with.
__________________
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 |
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#5 |
Badcaps Veteran
Join Date: Jan 2015
City & State: worcester
My Country: United Kingdom
I'm a: Knowledge Seeker
Posts: 2,680
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![]() output devices are generally fastened to large heat-sinks
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#6 |
New Member
Join Date: Jun 2020
City & State: Beirut
My Country: Lebanon
I'm a: Knowledge Seeker
Posts: 4
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![]() I am sorry for the late reply but i had very busy week. i have attached pictures of circuit boards with few diagrams from the service manual i found online that i think might help.
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