Re: Emerson hdtv troubleshooting
is that pic ok?
is that pic ok?
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Re: Emerson hdtv troubleshooting
bumpComment
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Re: Emerson hdtv troubleshooting
sorry,been extremely busy with our dog kennels and getting stuff ready for winter...
Was hoping someone would jump in,will try and find some time tonight..Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
ok..Comment
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Re: Emerson hdtv troubleshooting
Didn't forget about you.....super busy......Here's a gentle bump...selldoor,budm,tom66 anyone? I need some help with this one,too busy and it's getting close to being over my head
Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
bumpComment
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Re: Emerson hdtv troubleshooting
Coming back to fixing this tv....power board checks out ok,fuse is ok..but yet it looks like I have no power to the tv since the standby light is off when plugged in...could it be the cord itself?Comment
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Re: Emerson hdtv troubleshooting
This is old and long post so let's start fresh.
Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Emerson hdtv troubleshooting
Working on the same board, observing similar symptoms, "all 5v" measures 4.4v when disconnected and 4.1v when connected to the main board.
P-ON-H2 is 0v
Not sure what P-ON H1 for and why there are two of themComment
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Re: Emerson hdtv troubleshooting
Well I jumped the P-ON-H2 to AL +5v and the power board turned on just fine. +24v and some other voltages are present.
So it's the main board which is faulty then. It does not send the turn on signal to the PSU.
I have the same TV as in attached service manual by Budm above: https://www.badcaps.net/forum/showpo...7&postcount=46.
The motherboard is ba17f1g0401 4_1
Checked the AL +3.3v on the main board and it is present.
What would I check next? The owner said there was a power surge or something.Last edited by zape; 10-16-2019, 08:43 PM.Comment
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Re: Emerson hdtv troubleshooting
Found out that P-ON+3.3V is shorted to ground on the main board (2 ohm)Last edited by zape; 10-16-2019, 09:04 PM.Comment
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Re: Emerson hdtv troubleshooting
What is your TV model number?
https://www.shopjimmy.com/emerson-a1...-main-cba.htm#
Is this your board?
I do not any pin out printed on the board for the P-ON+3.3V.Last edited by budm; 10-16-2019, 09:16 PM.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=24809Comment
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Re: Emerson hdtv troubleshooting
Magnavox 32MF301B/F7
Board looks similar with 4_1 at the end instead of 5_1
there is no any markings on the board
P-ON +3.3v is produced by IC3001 on the main board, see page 45 on the manual on the link aboveLast edited by zape; 10-16-2019, 09:32 PM.Comment
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Re: Emerson hdtv troubleshooting
checked the MLC caps and the diod and the're goodAttached FilesLast edited by zape; 10-16-2019, 09:47 PM.Comment
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Re: Emerson hdtv troubleshooting
There are lots more caps connected in parallel to the PON-3.3V, some of them through the small inductors, not just what you have highlighted if look thorough the whole page, it is also fed to some other pages of the circuits too.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=24809Comment
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Re: Emerson hdtv troubleshooting
Yeah it's spread over the board, unfortunately I don't have a thermal camera
No idea how to find the short.Comment
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Re: Emerson hdtv troubleshooting
P-ON 3.3V Source and filter caps.
How many Ohms do you get on that line?
Magnavox_32MF301b-f7_chassis_fl11-4Never 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=24809Comment
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Re: Emerson hdtv troubleshooting
2.0-2.1 OhmComment
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Re: Emerson hdtv troubleshooting
It is going to be fun trying to find out which cap is shorted out, there are so many MLCC connected to that line.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=24809Comment
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Re: Emerson hdtv troubleshooting
I'll try to remove inductors
so it is not after L3026 and L3019Last edited by zape; 10-16-2019, 10:55 PM.Comment
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