XPost: comp.os.linux.misc, alt.comp.os.windows-10
From: not@telling.you.invalid
In comp.os.linux.misc J. P. Gilliver wrote:
> On 2025/7/16 19:41:52, Carlos E.R. wrote:
>> On 2025-07-16 18:52, VanguardLH wrote:
>>> Take a flashlight, and shine it at the display at an angle. Can you see
>>> what would have been displayed if the backlamps came on?
>>
>> I can easily try that. [...] You are absolutely right, I can see the
>> Compaq logo as it tries to boot.
>>
>> So, unless it is a faulty cable, it is garbage time.
>
> Certainly worth a try. Would be a pity to junk it just because something
> has come loose. The fact that you said it had given problems in the past
> that were curable by closing and opening it definitely _suggests_ either
> the connector, or the hinge switch, may be loose - though the inverter
> could indeed be flaky. But have a look first!
Actually there's no inverter, the service manual* states that it's
an "LED Display Assembly" and no separate backlight board is
listed. So an LED backlight. It could still be an issue with the
power supply for the LEDs, but potentially an issue on the
motherboard, not easily fixed by replacing a separate board. Or
a faulty wire/connector is still possible, though replacing modern
connectors for FFC cables is extremely difficult compared to eg. a
failed through-hole inverter capacitor, so I'd be most worried
about that really. I recently stuffed up one of my successful
repairs when I broke one of those unfathomably fine-pitched
connectors while reassembling the device afterwards. Extremely
frustrating! Oh for 1980s tech and its 0.1" spaced pin headers...
* https://h10032.www1.hp.com/ctg/Manual/c01740724.pdf (pg. 26)
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