Re: Hannspree HZ281 - black screen
I have exchanged both STU407DH with the new AOD609. Now the monitor runs again. Hurray.
Dear momaka, thank you very much for your kind support.
amelie2805
New Member
Last Activity: 10-08-2020, 06:51 AM
Joined: 09-28-2020
Location: Munich
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Re: Hannspree HZ281 - black screen
One of the two MOSFETs is blown.
As an alternative I ordered two AOD609. Can I combine one old STU407DH and one new AOD609, or should I take the two new AOD609?Leave a comment:
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Re: Hannspree HZ281 - black screen
Thanks very much.
Are their any alternative types of MOSFETs I could use, as these are difficult to get.Leave a comment:
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Re: Hannspree HZ281 - black screen
If I separate the inverter unit entirely from the PSU (+12V and GND), I measure 6MOhm between the 12V input of the inverter unit and GND of the inverter unit (i.e. neg. lead of the 1000uF cap).
The resistance of the MOSFETs is:
IC830
G1/S1 33kOhm
D1/S1 6.1MOhm
G1/D2 20kOhm
G2/S2 2.5Ohm
D2/S2 0Ohm
G2/D2 2.6Ohm
IC831
G1/S1 33kOhm
D1/S1 4.6MOhm
G1/D2 4.6MOhm
G2/S2 2.6Ohm
D2/S2 0Ohm
G2/D2 2.7Ohm
...Leave a comment:
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Re: Hannspree HZ281 - black screen
Between 12V power input to the inverter board and ground on the PSU its 5.4MOhm. Is there a different ground on the inverter board, and if yes, how can I find it?
IC830..833 are STU407DH (Dual Enhancement Mode FETs, N and P Channel)Leave a comment:
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Hannspree HZ281 - black screen
SUMMARY
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This is a Hannspree HZ281 28" LCD monitor. It has a black screen. The power LED is green, if connected to a computer.
THINGS TESTED
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1) All caps look good
2) Fuses F211, F220 and F720 on the PSU are ok
3) The connector between PSU and logic board (CN201) has +5V SB. If the computer is connected PS(ON) has 5V, but there is no voltage at pin 9 and 10 (+12V), and no voltage at pin 5 and 6 (+5V).
4) If I remove fuse F211 (which apparently connects the 12V rail to the inverter unit), I have the correct 12V... -
Re: New Members - please post your introductions here
Hi I am amelie2805 from Germany.Leave a comment:
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