Re: Denon AVR-X2500H burnt HDMI5
many thanks guys, then I'm going to buy a MN864788 replacement...hope to solve the issue! I'll let you know
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Denon AVR-X2500H burnt HDMI5
Hi everyone,
i've made a mistake due to haste.
I was soldering an HDMI male plug of a 15mt cable, while i forgot the other side connected to HDMI5 input of my Denon AVR-X2500H (that was off in standby, anyway).
During the soldering process, i've seen a little spark from a wire, when i was soldering it with my soldering iron tip.
After that, i've checked on the rear of the AV and I saw the HDMI5 male connected (the other side of the cable).
I've immediately disconnected it, but it was too late.
HDMI5 input is not working anymore, blank screen.
Fortunately...
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Re: Philips FR-740 working but no audio output
Fixed! -VPl was missing, found an high resistance on 3901 (should be 47ohm). Replaced and now seems to be working good.
Usually when a resistor is broken, i can see a black spot or something. This one was perfect like new, and i can measure an high resistance instead of the usual open circuit.
Thank you everyone very much for your help!
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Re: Philips FR-740 working but no audio output
IC7412 got 2 faulty output. Replaced, now i have 4.9V on AMP LR LINE, but still no sound.
On the C of 7309 i have -21V instead of -34.5V, and I have -40V on C of 7304, and I have almost -40V on pin 14 CCC instead of -33.5V (C of 7310).
HST & DC Protection Circuit seems to be good.
Very low voltages on 7909 and 7902.
All those transistor have already been replaced.
Any advice?
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Re: Philips FR-740 working but no audio output
Hi everyone, due to Lockdown here in Italy, I decided to disassembly the Philips FR740 again to find out the issue. Hope to fix it this time.
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Re: Philips FR-740 working but no audio output
i don't know...maybe you're right.
For sure I don't have so much experience... I go on with attempts.
The amplifier is not mine, the owner is a friend.
If she wants to bin it, then i will take it back....
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Re: Philips FR-740 working but no audio output
sorry friend, i've just reassembled it. I give up.
Too much time wasted, and can't find a solution still.
Thanks to you for all your kindness and patience, your tips were useful to improve my troubleshooting skills.
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Re: Philips FR-740 working but no audio output
No still no audio voltage on CCC too high, don't know why. Without transistor, C of 7310 is -37.7V.
Tried replacing cap 2350 without success...Last edited by seve91; 02-26-2018, 08:28 AM.
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Re: Philips FR-740 working but no audio output
replaced 7309, 7304, 7310, 7902, 7909. same voltages remain.
Could be a bad capacitor somewhere? Why the voltage is too high?
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Re: Philips FR-740 working but no audio output
i know that the voltage on C of 7309 is wrong, but i don't know how to fix it.
I'm trying to desolder and test.
Desoldered cap 2365, nothing changed. Cap tested with ESR meter, is good.
Resoldered the cap back and desoldered 7309.
So as you said, 7309 was E-C shorted, because now on C of 7309 i got -36.6V (without the 7309).
So i need to order a replacement for sure. But probably there is another fault in the main board or in the front board
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Re: Philips FR-740 working but no audio output
base 7902 = -40V
so what could be the next step? try replacing a transistor?
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Re: Philips FR-740 working but no audio output
the resistors are all SMD and all are in good conditions.
Voltages:
3329: -39.6V (B of 7304) and -1.44V (C of 7309)
3936: -39.8V (B of 7909) and -38.15V (to 4910)
3918: -40.28V (to 3935) and -40.27V (C of 7902)
3935: -40.16 (C of 7909) and -40.18V (to 3918)
is it possible that one of these transistors is not working good?
I don't know if it can help, but every time i touch the tip of oscilloscope probe to C of 7310 (pin 14 CCC of STK496-270) i can hear a click coming from...Last edited by seve91; 02-18-2018, 09:59 AM.
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Re: Philips FR-740 working but no audio output
these are the voltages measured:
7309: E= 3.4V, B= 3.05V, C= -1.4V
7304: E= -40.3V, B= -39.6V, C= -40.3V
7902: E= -40.3V, B= -39.6V, C= -40.3V
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Re: Philips FR-740 working but no audio output
Yes exactly, test = pass and format = new.
Tried to connect anode 6305 AMP IR ON to AMP S ON that was at 5.2V, but now they are both 0.4V
I tried also to desolder the anode from the mainboard to disconnect it from the circuit, and solder the anode directly to pin 2 of 1426 (5.2V).
Now i have 4.6V on that pin, but no audio. Could 7309 be in short?...Last edited by seve91; 02-14-2018, 03:44 AM.
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Re: Philips FR-740 working but no audio output
yes 0V on E and B of 7253, 5.12V on C of 7253 and pin 2 of plug 1426.
Done all the tests, all is ok except for tuner test. If i press TUNER it goes immediately in tuner mode (it exits from service mode instead of doing the test, but with headphones i'm sure that tuner is working good, i can listen to the radio).
Done the factory reset, but still no audio....
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Re: Philips FR-740 working but no audio output
and how i can find the fault?
I found out a strange thing when measuring pin 6 with the oscilloscope probe.
If i connect the ground of the probe to the chassis of the device, i got 0V.
If i disconnect the ground of the probe (and i leave it free, without connecting) it detects this signal from pin 6.
How is it possible?
...
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Re: Philips FR-740 working but no audio output
Pin1,2,6 of IC7412 are 0V. So i need to replace the CPU 7415?...
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Re: Old Lenco R600 Stereo
which contact grease do you advice? I was thinking about WD40
Why is not suggested?...
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Re: Old Lenco R600 Stereo
looks like that all these contact cleaners evaporate without residue.
Anyway i've bought it from US, i hope to fix the issue because it's impossible to find the replacement for the volume/balance pot
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Re: Old Lenco R600 Stereo
buying it from Italy is quite expensive. If is that good as you said, i'll buy it.
Otherwise if you can advice me a "local" alternative products would be better.
thanks
EDIT: Bought from the US...almost 29 euros....Last edited by seve91; 01-22-2018, 02:23 PM.
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