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Search: Posts Made By: R_J
Forum: Troubleshooting TVs and Video Sources Yesterday, 07:33 PM
Replies: 6
Views: 119
Posted By R_J
Re: Dune Duo multimedia player Power supply

It is more likely that the small electrolytic cap next to the ic is bad. Post a clear picture of the bottom of the board as well as a clear view of the trace side under the ic.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 12:14 PM
Replies: 41
Views: 1,154
Posted By R_J
Forum: Troubleshooting TVs and Video Sources 10-01-2022, 03:58 PM
Replies: 5
Views: 124
Posted By R_J
Re: Susceptible disc tray on Yamaha BD-S673

The rubber drive belt can also get deformed and basically formed to its position around the two pulleys, if this is the case it can slip and not open the tray. with the magnetic clamper removed there...
Forum: General Electronics Technical Discussion 09-28-2022, 08:12 PM
Replies: 7
Views: 219
Posted By R_J
Re: Diode identification

What type of drive? there are different types.
Where is the diode in the circuit? is it across the supply voltage? if it is it is likely a zener or TVS diode
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-27-2022, 08:39 PM
Replies: 11
Views: 182
Posted By R_J
Re: ELBA tower fan keeps blowing resistor

It sure looks like it is bad, the internal mosfet has 14Ω across drain and source, it should be basically open. It could also be something else that is bad so start by removing the ic and checking...
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-27-2022, 02:55 PM
Replies: 11
Views: 182
Posted By R_J
Re: ELBA tower fan keeps blowing resistor

It's not a 3845 it is a OB2223AP, d3845 is a date code
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-27-2022, 10:54 AM
Replies: 2
Views: 136
Posted By R_J
Re: Help to identify parts please - ''CUACA''

It should be a Silergy SY8009BABC
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-27-2022, 10:34 AM
Replies: 11
Views: 182
Posted By R_J
Re: ELBA tower fan keeps blowing resistor

Pins 5&6 are connected together, pins 7&8 are also connected together, so just check the resistance between the two pins 5&7
If C4 is the 10f cap I would stick with that value, if you go higher you...
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-26-2022, 08:31 PM
Replies: 11
Views: 182
Posted By R_J
Re: ELBA tower fan keeps blowing resistor

U1 is likely blown, Check resistance between 5or6 and 7or8
I would also replace C4 and maybe the other 2 electrolytic's as well
Forum: Troubleshooting Audio Equipment 09-24-2022, 12:44 PM
Replies: 22
Views: 381
Posted By R_J
Re: Car Audio Delco identification and restoration / repair

Can you tune in any AM or FM stations? have you tried playing a cassette tape?
Forum: Troubleshooting Audio Equipment 09-23-2022, 11:54 AM
Replies: 22
Views: 381
Posted By R_J
Re: Car Audio Delco identification and restoration / repair

If the clock display is on, it could be the radio in not actually turned on. What is the voltage on the resistor R240? if it was open, something else on that line may be damaged, check if you have...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-22-2022, 10:35 PM
Replies: 1
Views: 93
Posted By R_J
Re: Shuttle HOT-433 component identification

Check it with your meter, likely pin1 is common and each other pin will be 1.5k
Forum: Troubleshooting Audio Equipment 09-22-2022, 10:09 PM
Replies: 22
Views: 381
Posted By R_J
Re: Car Audio Delco identification and restoration / repair

The 2 pin cable will require +12 volts for the Batt lead as well as +12 volts to the PK Lights lead. This controls the display. the DIM connection controls the brightness of the internal (trim panel)...
Forum: Troubleshooting Audio Equipment 09-22-2022, 08:43 AM
Replies: 22
Views: 381
Posted By R_J
Forum: Troubleshooting Audio Equipment 09-21-2022, 09:04 PM
Replies: 22
Views: 381
Posted By R_J
Re: Car Audio Delco identification and restoration / repair

The Red wire is likely for the constant memory backup, the brown should be for the display, connecting it to +12v should light the display
Forum: Troubleshooting Audio Equipment 09-21-2022, 08:14 PM
Replies: 22
Views: 381
Posted By R_J
Re: Car Audio Delco identification and restoration / repair

I believe the 2 pin plug is for constant +12v (memory) and display lamp (controlled by dash lamp dimmer)
Forum: Troubleshooting TVs and Video Sources 09-18-2022, 05:05 PM
Replies: 53
Views: 844
Posted By R_J
Re: ONN 100012588 Has fluctuating Voltage on PSU 12v

If you look ath the top of the board, there is a black rectangle around the optocoupler and one of the corners is not like the others

Does it look like it has been replaced (fresh solder) It seems...
Forum: Troubleshooting TVs and Video Sources 09-18-2022, 04:52 PM
Replies: 53
Views: 844
Posted By R_J
Re: ONN 100012588 Has fluctuating Voltage on PSU 12v

The optocoupler is in the correct way. see the pin 1 dot on the ic, it matches the pin1 of the board (cutoff corner)
Pin 1&2 are the led and are on the secondary side of the power supply, pins 3&4...
Forum: Troubleshooting TVs and Video Sources 09-18-2022, 02:59 PM
Replies: 53
Views: 844
Posted By R_J
Re: ONN 100012588 Has fluctuating Voltage on PSU 12v

U302 is not a zener, it is a shunt regulator ic, The reference is connected to a resistor divider network, one end is ground, the other end of the divider connects to the +12v output, when the +12v...
Forum: Troubleshooting TVs and Video Sources 09-17-2022, 08:17 PM
Replies: 53
Views: 844
Posted By R_J
Re: ONN 100012588 Has fluctuating Voltage on PSU 12v

When the power supply is in standby the pfc circuit should be OFF, so the voltage across the main caps (EC102) should only be 160vdc. I suspect something is damaged around the optocoupler, and...
Forum: Troubleshooting TVs and Video Sources 09-17-2022, 06:16 PM
Replies: 53
Views: 844
Posted By R_J
Forum: Troubleshooting TVs and Video Sources 09-17-2022, 05:11 PM
Replies: 53
Views: 844
Posted By R_J
Forum: Troubleshooting TVs and Video Sources 09-17-2022, 11:41 AM
Replies: 2
Views: 155
Posted By R_J
Re: F&U FL23406P standby blinks 7 times then nothing

I suspect the backlight strips, likely one ore more shorted led's The power supply monitors the current and will shut down when there is a problem, the backlight tester will not and also supplies a...
Forum: Troubleshooting TVs and Video Sources 09-16-2022, 08:16 PM
Replies: 11
Views: 312
Posted By R_J
Re: samsung lt22c300ew - psu pslf560501a no power

Check the voltage ACROSS CM807, this is the vcc voltage for the ic (around 15~20vdc), also try replacing CM807. Check the resistance of RM803 out of circuit, then check DM803 smd diode in parallel...
Forum: Troubleshooting TVs and Video Sources 09-16-2022, 05:57 PM
Replies: 53
Views: 844
Posted By R_J
Re: ONN 100012588 Has fluctuating Voltage on PSU 12v

This power supply is an always on power supply, in standby the pfc circuit is off and the main switching ic is likely in burst mode, that is why the voltage on the 12v line is low, anywhere from 8 to...
Showing results 1 to 25 of 500

 
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