Re: LCD 19" BENQ T905 problems
So, for the end of the story:
The soldering iron heat detached a new track for the board when i changed 1000uF caps. I had to wrap a wire.
Only the 5707 were burnt. After the soldering of transformers & various elements, the lcd is working very well.
Thank you both !
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Last Activity: 11-29-2010, 05:43 PM
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Re: LCD 19" BENQ T905 problems
exactly 4.55$, with shipping. First i tryed to order the components at Farnells, a French (worldwide ? idk) reseller. But at the end, it was up with too much for a 'tutorial' repair:
2€ per c5707 so 4€ total
3A fuses per 10 only for 5.5€ total
2€ par 9024 - wasn't planning to buy one, but it can help -
4 € for various caps (was interested in replacing all elite's)
and 12€ of shipping...
With the Chinese eBay provider 's set, i can afford a not working c5707...Leave a comment:
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Re: New Members - please post your introductions here
Hi BadCaps !
I'm actually slowly experiencing hardware repairing. I have worked a in embedded devices, on the software side (6800 68000 various PIC) so i have a general comprehension of hardware rather good.
But i definitively lack experience, eye shot, and quick troubleshooting, which most of you own here.
Long life to BadCaps
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Re: LCD 19" BENQ T905 problems
ok.
My bad: the caliber is 2000 ohms. No decimal display, the lowest number i can get is 0001 - if we except 0000.
For a set of transistor, i have 1 ohm on each B/C/E junctions.
For the other set, i have around 660 ohms for BC/CE/BE/CB junctions, 900 ohms for EB, and 100 ohms for EC. I assume they are ok
For the picofuse, 1 ohm, same as failed transistors. I think this is the rounding.
For 9024, i have junctions BCE going from 800 to 1200 ohms base values, always increasing (i assume...Leave a comment:
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Re: LCD 19" BENQ T905 problems
Thank you retiredcaps, this is exactly i was aiming to do.
Just to confirm, i have to unsold c5707, 9024 and picofuse to test them; i have to simply check if they are not shorted in anyway (except the picofuse which must be short).
Thank you for your advices !Leave a comment:
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Re: LCD 19" BENQ T905 problems
Hi retiredcaps,
I have a low cost multimeter i bought at least 15 years ago. 2 calibers (2000kohm, 200ohms with 2 digits), max 200 V DC so i can't even check the transformer output.
I plan to replace the picofuse in all ways, because i guess i'd not be able to precisely measure its state.
I 'd really appreciate an oscilloscope, but i clearly can't afford
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Re: LCD 19" BENQ T905 problems
Hello.
I'm new too. I have the first failure described in this thread:
- Power on - Led stay green
- BenQ logo stays for 500ms
- auto power off
I can reproduce the problem.
I have read numerous threads about it. I have replaced 2 bad-shape 1000uF 10v caps.
I'm now in the mood of trying the big step:
- resolder the transformers
- change the picofuse
- change the FET
- change the c5707 transistor
(post #21 strict compliance)
Do you think...Leave a comment:
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