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Search: Posts Made By: R_J
Forum: Troubleshooting TVs and Video Sources Today, 11:55 AM
Replies: 12
Views: 244
Posted By R_J
Re: Samsung smart tv bad power board BN44-0503A

163v across the main cap indicates the board is either not turned ON or the pfc circuit is not working. Is the main board connected? if it is, disconnecting it should force the power supply ON.
...
Forum: General Electronics Technical Discussion Today, 11:26 AM
Replies: 3
Views: 54
Posted By R_J
Re: B1186A Digital Transistor?

I agree, it is a Rohm 2SB1186A, Usually paired with a (NPN) 2SD1763A
Most of the "digital transistors" I have seen are small case low power, not to220
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 06-19-2021, 10:11 PM
Replies: 3
Views: 146
Posted By R_J
Re: SSD repair

Did you check if there was a firmware update? Although unlikely, I know some of their ssd's had a problem at 40,000 hrs (40,000 hr bug)
I believe your model is a SDSA5DK-064G (you were missing the 4)
Forum: General Computer & Tech Discussion 06-19-2021, 07:34 PM
Replies: 2
Views: 33
Posted By R_J
Re: Preventing Windows 10 from installing stuff without my permission

Try using the Show Hide update tool KB3073930, You may need to get it from majorgeeks
Forum: Troubleshooting TVs and Video Sources 06-17-2021, 06:38 PM
Replies: 12
Views: 244
Posted By R_J
Re: Samsung smart tv bad power board BN44-0503A

If you have "nothing"(no voltage) on the main filter, your main fuse is likely open. But this can not be the case if you have A5V standby voltage.
Recheck the voltage across the main filter cap...
Forum: General Electronics Technical Discussion 06-16-2021, 07:27 PM
Replies: 16
Views: 253
Posted By R_J
Re: ECH81/6AJ8 Vacuum Tube Question

The B+ seems to be fine, I would have been concerned if it was around 250 volts.
Forum: General Electronics Technical Discussion 06-15-2021, 06:23 PM
Replies: 16
Views: 253
Posted By R_J
Re: ECH81/6AJ8 Vacuum Tube Question

The 6X4 tube has a voltage drop of 22 volts per plate at 70ma per plate. Measure the voltage across the main filter to make sure the voltage is not too high for the cap and also the other tubes.
Forum: Troubleshooting Audio Equipment 06-13-2021, 01:00 PM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

Diodes can short and still LOOK good. check that the diodes are not shorted
This does not seem right, I can see -30v on the emitter, but if the transistor is good it should not show -30 on the...
Forum: Troubleshooting Audio Equipment 06-13-2021, 12:23 PM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

The regulator circuit controls the negative side and not the positive side like a "normal" circuit would. R107's reading could be effected by a charged C101. make sure it's not open.
The -6v voltage...
Forum: Troubleshooting TVs and Video Sources 06-13-2021, 11:24 AM
Replies: 25
Views: 666
Posted By R_J
Re: Samsung PN51F8500AFXZA, PSU BN44-00619A, Short QP802S, ICP801S testing/sourcing

I had an LG/Goldstar meter that I would use on the bench, one time I went to check the Vs voltage on a working plasma tv and the meter suggested the 200v was actually over the meters range of 1000v,...
Forum: Troubleshooting TVs and Video Sources 06-13-2021, 10:49 AM
Replies: 25
Views: 666
Posted By R_J
Re: Samsung PN51F8500AFXZA, PSU BN44-00619A, Short QP802S, ICP801S testing/sourcing

I can't see how the voltage would drop from 160vdc to 116vdc. What make/model meter are you using to check this voltage? Try using a different meter if you can.
Forum: Troubleshooting Audio Equipment 06-13-2021, 10:24 AM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

It looks like Q102 is not being turned on to lower the voltage to -6v. Check the resistors in that area, like R107 across Q102, R103, & zener ZP12. I would also work the pot P106 back & forth in case...
Forum: Troubleshooting TVs and Video Sources 06-12-2021, 09:37 PM
Replies: 25
Views: 666
Posted By R_J
Re: Samsung PN51F8500AFXZA, PSU BN44-00619A, Short QP802S, ICP801S testing/sourcing

Check the AC voltage right at the bridge recitier to see if it is 118v
The only thing I can think of is that the high frequency of the pfc circuit is causing your meter to read a wrong value.
There...
Forum: Troubleshooting TVs and Video Sources 06-12-2021, 08:40 PM
Replies: 25
Views: 666
Posted By R_J
Re: Samsung PN51F8500AFXZA, PSU BN44-00619A, Short QP802S, ICP801S testing/sourcing

When you measure the voltage across + & - of the bridge rectifier, it should read 160vdc, When you measure across the main caps, you will get 160vdc in Standby, but you will get +397vdc when the...
Forum: Troubleshooting TVs and Video Sources 06-12-2021, 06:56 PM
Replies: 4
Views: 118
Posted By R_J
Re: Samsung QE55Q7F Main board question

I looked at pictures of both boards and they do look different, CN1105, CN1102, CN1104, also other parts are not used on the 11487 but are installed on the 12660, these plugs/transistors etc. are not...
Forum: Troubleshooting Audio Equipment 06-12-2021, 06:29 PM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

There is a fuse, F102, (630ma) for the +21v, it is on the tape drive control board. The Capstan speed control circuit is supplied by +21v. So you are likely on the right track.
Forum: Troubleshooting TVs and Video Sources 06-12-2021, 06:09 PM
Replies: 25
Views: 666
Posted By R_J
Re: Samsung PN51F8500AFXZA, PSU BN44-00619A, Short QP802S, ICP801S testing/sourcing

When the power supply is ON, check if the NT801S is warm/hot, When the power supply is ON, the relay should short out NT801S, If the relay contacts are weak/dirty there will be a voltage drop across...
Forum: Troubleshooting Audio Equipment 06-12-2021, 05:32 PM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

I don't think the end of tape light could be the issue, I would think without the lamp the unit should still play but would not shut off at the end of tape. I downloaded the Revox A77 service manual...
Forum: Troubleshooting Audio Equipment 06-12-2021, 12:29 PM
Replies: 38
Views: 288
Posted By R_J
Re: Revox A77 MKIV, No play speeds

In play mode, it is the Capstan that drives the tape, Is the capstan motor working? Check that the motor is not seized, and check C151 motor capacitor.
Forum: Troubleshooting TVs and Video Sources 06-12-2021, 12:13 PM
Replies: 4
Views: 164
Posted By R_J
Re: Philips TV 42PFL3606H/58 (Thriller) (TPM6.1E) PSU problem (wrong Vdd-S)

What is the voltage on IC905 pin 1 in standby and when S/B pin is turned on? Post pin2's voltage as well, this should determine the state of the ic.
Check that ZD907 is not bad
Forum: Troubleshooting TVs and Video Sources 06-11-2021, 04:53 PM
Replies: 4
Views: 164
Posted By R_J
Re: Philips TV 42PFL3606H/58 (Thriller) (TPM6.1E) PSU problem (wrong Vdd-S)

Check that ic907 optocoupler is working and that it enables ic905, It could be that the ic is staying in standby (burst mode)
Forum: General Capacitor Questions & Issues 06-10-2021, 06:51 PM
Replies: 15
Views: 289
Posted By R_J
Re: This can't be right...

Is this the original problem with the monitor BEFORE you replaced the capacitors?
That fault looks like it is with the power supply, What is the voltage on TR24 collector?
Upload the service...
Forum: General Electronics Technical Discussion 06-10-2021, 06:36 PM
Replies: 16
Views: 253
Posted By R_J
Re: ECH81/6AJ8 Vacuum Tube Question

It looks like the tube is used for both FM and AM I suspect the tube is ok but might test low in the tube tester. What does it use for an AM antenna? It might require an external AM antenna.
If you...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-09-2021, 09:58 AM
Replies: 5
Views: 127
Posted By R_J
Re: Power Supply 2273+3362 PSU in STBY

If D2 voltage is 12v on both sides it because the led boost circuit is not working, likely cause is an open led in the backlight circuit. If the backlight is open, the circuit will go into over...
Forum: General Capacitor Questions & Issues 06-09-2021, 09:41 AM
Replies: 15
Views: 289
Posted By R_J
Re: This can't be right...

The small cap will not handle the current, it will last about 1 minute and blow. Leave the original in place. If it was bad (as in open) you would have no horizontal deflection. You could use a 18f...
Showing results 1 to 25 of 500

 
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