Thanks for hint
Radekqr
New Member
Last Activity: 04-10-2025, 09:13 AM
Joined: 05-17-2021
Location: Warsaw
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Re: Lenovo Yoga 910 Charging Problem
Thanks for hint
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Re: Lenovo Yoga 910 Charging Problem
Adapter is working fine with other lenovo laptop.
Red to ground, black to CC1 / CC2 on JP8 connector shows 0.6
Now checking for a faulty usbc socket...Leave a comment:
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Re: Lenovo Yoga 910 Charging Problem
Hi!
Bump - anybody solved issue with 5v only and no charging?
I replaced pu10 (was burned) pq 10-11, 15,16, 19,20, 8 (only pq16 was burned), measured all resistors nearby, checked caps - still nothing.
Latop turns on only on battery, not on usbc, and no charging...
No VIN voltage, on PQ10-11 only 5v
Help!Leave a comment:
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Re: Technics CH-540 VF Display - troubleshooting help
Thanks!
5,7V AC comes from separate trafo wires.
I found the issue - i was measuring also the flex cable and connectors many many times and it was ok. It turns out that after connecting flex to socket, one wire (of course, AC) slided off
and that's why AC was missing after connecting to board... ehhh...
Cut the flex, made new connection and et voila! it works
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Re: Technics CH-540 VF Display - troubleshooting help
Whats more - i put external +5v dc on heater and display works... don't know what to thinkLeave a comment:
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Re: Technics CH-540 VF Display - troubleshooting help
R_J thanks for reply.
Without display board connected (so without c916 and c917) AC voltage also jumps from 10 to 0v.
Just replaced D622 to be sure. Checked R621 622 - both ok 150ohm.
Lines do not glow - no ac voltage
Last edited by Radekqr; 05-18-2021, 05:34 AM.Leave a comment:
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Technics CH-540 VF Display - troubleshooting help
Hi guys,
i saved this HiFi from trash. It only problem last is the VF display - it shows nothing. I searched for simmilar topics and found one, but still havent figure it out.
I have schematics, replaced caps C615-C620, i have negative -25V to -30V on all display pins (including fl1, fl2 - heater) but no AC voltage there.
AC voltage is present on c615 cap (around 10v as i remember)
Between FL1 and FL2 i have ~6 ohms, no AC voltage. From FL1 or FL2 to GND i have 3,5V AC (and -29V DC as i wrote) or jumping 12V to 0V (short + protection?)... -
Re: New Members - please post your introductions here
Hi guys, just decided to join, till now i was only reading solutions, now maybe i could also help and ask
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