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Search: Posts Made By: R_J
Forum: Troubleshooting Audio Equipment Yesterday, 08:55 PM
Replies: 7
Views: 122
Posted By R_J
Re: Panasonic SA-MAX770 (not turning on)

PCONT is the Power CONTrol pin, it is used to turn ON the power supply. If there is no VCC on ic1501, the sense pin means nothing, the ic is not operating at this point.

PCONT goes to (P1) on page...
Forum: Troubleshooting Audio Equipment Yesterday, 07:15 PM
Replies: 7
Views: 122
Posted By R_J
Re: Panasonic SA-MAX770 (not turning on)

Do you have VC1 on pin1 of ic1501? What is your voltage on CN1851, pin4 (PCONT)?
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:35 PM
Replies: 9
Views: 135
Posted By R_J
Re: Ps64e8000 powersupply troubleshoot

Based on a similar schematic BN44-00445C, that uses a ICE3BR1065JF
CX814 = 474/16v (1608) pin3
CX812 = 104/50v (1608) pin4
CX813 = 103/50v (1608) pin6

There is an electrolytic cap (CM802?)...
Forum: Troubleshooting TVs and Video Sources Yesterday, 05:39 PM
Replies: 9
Views: 135
Posted By R_J
Re: Ps64e8000 powersupply troubleshoot

The correct path is the red line, that is the vcc for pin4 of the ic

What are you using for a solder iron?
Forum: Troubleshooting Audio Equipment Yesterday, 11:47 AM
Replies: 3
Views: 51
Posted By R_J
Re: Marantz 74CD80/04B Optical port required

The totx172 and totx173 seem to be the same, the (8.2k) resistor is current limiting for the L.E.D. the txt177 is the newer 3 pin version, it functions the same but does not require the external...
Forum: Troubleshooting TVs and Video Sources 10-03-2022, 10:36 AM
Replies: 8
Views: 145
Posted By R_J
Re: lg 55un73006 tv connection with denon amplifier

The avr-1705 has an optical input, the tv has an optical output, all you need is an optical cable between them.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-03-2022, 09:55 AM
Replies: 50
Views: 13,234
Posted By R_J
Re: Richtek marking code

Yes, it is a Richtek RT8249CGQW
Forum: Troubleshooting TVs and Video Sources 10-02-2022, 07:33 PM
Replies: 6
Views: 173
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 10-02-2022, 12:14 PM
Replies: 41
Views: 1,236
Posted By R_J
Forum: Troubleshooting TVs and Video Sources 10-01-2022, 03:58 PM
Replies: 5
Views: 166
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: 259
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: 191
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: 191
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: 162
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: 191
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: 191
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: 421
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: 421
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: 105
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: 421
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: 421
Posted By R_J
Forum: Troubleshooting Audio Equipment 09-21-2022, 09:04 PM
Replies: 22
Views: 421
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: 421
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: 884
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: 884
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...
Showing results 1 to 25 of 500

 
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