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Search: Posts Made By: budm
Forum: Troubleshooting Computer Displays 08-11-2018, 01:51 PM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

It will take only one bad lamp to activate the protection circuit and shutdown the whole inverter circui. it is also a reason you need at least 2 test lamps.-
Forum: Troubleshooting Computer Displays 08-09-2018, 09:57 AM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

You will have to put a bunch of resistors in series for the resistors to handle up to 1500V, you need to find out what the breakdown Voltage rating of the resistor is.
Forum: Troubleshooting Computer Displays 08-08-2018, 06:03 PM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

The problem of using just one test lamp is that you could have two bad lamps.
When I work on inverter that use 4 lamps I will use two test lamps for testing.
Bad worn out lamp will still light up...
Forum: Troubleshooting Computer Displays 08-07-2018, 09:54 AM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

You do not have two test lamps?
Condition of the laptop lamp?
BTW, did you check the resistance between Source and Drain of the Q802, 803 Dual MOSFETs?
Forum: Troubleshooting Computer Displays 08-05-2018, 01:17 PM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

At this point I would use two CCFL (or CFL) for testing the inverter circuit.
Forum: Troubleshooting Computer Displays 08-03-2018, 02:57 PM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

OK, thanks for better picture of the bottom side of the board so now I can see that the red fuse F903 is not for the inverter section but the SMD FUSE F801 ('D' printed on top) is the fuse for...
Forum: Troubleshooting Computer Displays 08-02-2018, 10:08 AM
Replies: 20
Views: 1,564
Posted By budm
Re: neovo H-W22S black screen

Did you check the red rectangular fuse in the cold side next to the filter caps?
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