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Search: Posts Made By: dkneyle
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 11:29 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

Looks like I'm going to have to buy a complete inverter board. Type RUNTKA334WJZZ Backlight Inverter VIJ38002.50. I should be able to get one landed in Oz for about A$50, making it a 'just...
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 09:55 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

Clever boys you both! Got inverter out without any drama. Ran the ohmmeter over the secondaries of the transformers. Consistent value is about 1.8k. However, T7504 was many Kohms. About 43k...
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 07:57 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

Thanks RJ. I see what you mean from the exploded view. And I've also seen that arcing/corrosion before that you mention, on other panels I've stripped down. Will let you know how I go.
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 06:59 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

I'll go carefully and if they don't slide out (as you'd indicated in your post before editing) I won't force the point!
If the board does slide out, I suppose I could check the functionality of the...
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 06:29 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

Just a question about removing the inverter board from your experience. Years ago when first getting into this hobby I recall removing an inverter board and ending up with broken ends of CCFL tubes...
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 05:45 PM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

I'm pretty sure this is the situation. I can see the CCFL tubes briefly come on then the TV shuts off. I doubt there is anything wrong with the inverter. I've told the owner it is likely a...
Forum: Troubleshooting TVs and Video Sources 07-15-2019, 04:37 AM
Replies: 16
Views: 133
Posted By dkneyle
Re: Sharp LC-37B20E difficulty accessing service mode

Yes mate, that is what I'm doing. And as I reported in my first post, something a bit different does happen, but it still shuts down just before service menu starts up
Forum: Troubleshooting TVs and Video Sources 07-14-2019, 10:52 PM
Replies: 16
Views: 133
Posted By dkneyle
Sharp LC-37B20E difficulty accessing service mode

I'm getting a blink code which indicates a lamp problem. Following guidance I see on YouTube etc, the suggestion is to re-set the lamp failure counter before going too far further. I use the...
Forum: Troubleshooting TVs and Video Sources 03-03-2019, 03:00 PM
Replies: 2
Views: 145
Posted By dkneyle
Re: Toshiba 37XV500A low backlight intensity

Haven't got the set with me at the moment, so I can't send pictures. I opened it up and was presented with one of the most complex LCDs I've ever seen. Many, many circuit boards.
I can only see...
Forum: Troubleshooting TVs and Video Sources 02-26-2019, 01:25 AM
Replies: 2
Views: 145
Posted By dkneyle
Toshiba 37XV500A low backlight intensity

Have set backlight intensity to 100%. Output intensity of backlight is about 30% would be my guess. Unsure of history of this set. What is likely to be the cause? Worn out CCFL tubes or an...
Forum: Troubleshooting TVs and Video Sources 01-26-2019, 08:11 PM
Replies: 8
Views: 190
Posted By dkneyle
Re: Samsung Plasma PS42C451 no picture, good sound

Before deciding to seek out a replacement mainboard I did what I should have done first. I reseated the video signal cable between the mainboard and the logic board. I also reseated the mainboard...
Forum: Troubleshooting TVs and Video Sources 01-26-2019, 06:58 PM
Replies: 8
Views: 190
Posted By dkneyle
Re: Samsung Plasma PS42C451 no picture, good sound

From what I've been reading, if the test patterns are OK then the Logic Board will also be OK. Leaving the Mainboard I guess?
Forum: Troubleshooting TVs and Video Sources 01-26-2019, 05:26 PM
Replies: 8
Views: 190
Posted By dkneyle
Re: Samsung Plasma PS42C451 no picture, good sound

Sorry, I'm an idiot. There is a very small power connector going from the Y-Sus board to the z-Board running along the bottom of the screen and I hadn't put it back on.

So test patterns run all...
Forum: Troubleshooting TVs and Video Sources 01-26-2019, 04:35 PM
Replies: 8
Views: 190
Posted By dkneyle
Re: Samsung Plasma PS42C451 no picture, good sound

Have placed jumper in position to attempt to run the test patterns. In a darkened room I can see the occasional VERY dim white-wash screen as it runs through its patterns.
All voltages to the Y-Sus...
Forum: Troubleshooting TVs and Video Sources 01-25-2019, 06:59 PM
Replies: 1
Views: 2,157
Posted By dkneyle
Re: lcd sansui 321, MP116T power supply

I had this very same issue in a badge-engineered Chinese set (Bostton) that used this power supply. It appeared to be heat-related (only once the power supply was up to temperature did it emerge). ...
Forum: Troubleshooting TVs and Video Sources 01-21-2019, 03:37 AM
Replies: 8
Views: 190
Posted By dkneyle
Samsung Plasma PS42C451 no picture, good sound

My neighbour reported he just turned it on, had sound, no picture. I can confirm there is no indication of any illumination whatsoever from the screen. All voltages seem to check out OK: Vs, Vscan...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-02-2019, 01:02 AM
Replies: 6
Views: 399
Posted By dkneyle
Re: Canon K30321 / Delta EADP-24NP

The SMT controller chip is marked 1219A6. I've attached the spec sheet for this device.

(I'm just following up on this thread even though I've ordered a replacement from China. Might help...
Forum: Troubleshooting TVs and Video Sources 12-19-2018, 04:51 AM
Replies: 6
Views: 197
Posted By dkneyle
Re: JVC LT48N530A no image or sound power supply OK

Just to close off the thread, I stripped it down, and checked the LED strips. 3 failed LEDs in total. So it was a panel fault.
Forum: Troubleshooting TVs and Video Sources 12-19-2018, 04:50 AM
Replies: 7
Views: 206
Posted By dkneyle
Re: T-con: T370hw02 ve (37t04-c0j)t-con: T370hw02 ve (37t04-c0j)

Just to close the thread, I replaced with a new T-Con out of China, specifically for the 40 inch screen, and all is good!
Forum: Troubleshooting Power Supplies and Power Supply Design 12-18-2018, 11:49 PM
Replies: 6
Views: 399
Posted By dkneyle
Re: Canon K30321 / Delta EADP-24NP

The schematic I've posted her (for a different Canon power supply) and the actual board I have are actually quite different once I started to analyse the circuit.
Anyway, there is a zener marked...
Forum: Troubleshooting Audio Equipment 12-18-2018, 10:25 PM
Replies: 95
Views: 14,936
Posted By dkneyle
Re: Yamaha Electric Piano CLP550 no keyboard output

Great to know. You have proven it is the ROMs which are at fault. Well done, and now we have a copy of Yamaha's ROM code available in the world wide web!
Forum: Troubleshooting Power Supplies and Power Supply Design 12-14-2018, 10:57 PM
Replies: 6
Views: 399
Posted By dkneyle
Re: Canon K30321 / Delta EADP-24NP

Here are the spec sheets for those two FETs
Forum: Troubleshooting Power Supplies and Power Supply Design 12-14-2018, 10:40 PM
Replies: 6
Views: 399
Posted By dkneyle
Canon K30321 / Delta EADP-24NP

Used in a Canon printer to provide 24V supply.

Printer was dead and I could measure no voltage out of PS so I opened it up. Was presented with a main electrolytic which had electrolyte crystals...
Forum: Troubleshooting Audio Equipment 12-12-2018, 04:14 AM
Replies: 95
Views: 14,936
Posted By dkneyle
Re: Yamaha Electric Piano CLP550 no keyboard output

Yes, it is our understanding they are wavetables. Not sure if they are interchangeable or not? The circuit diagram certainly shows some logic goes on concerning the chip select (CS) line, which...
Forum: Troubleshooting Audio Equipment 12-10-2018, 03:25 PM
Replies: 95
Views: 14,936
Posted By dkneyle
Re: Yamaha Electric Piano CLP550 no keyboard output

STJ is the expert here who knows about ROM chips. He might be in a position to understand the discrepancy in the code recovered from those two chips. What we really need now is someone with a...
Showing results 1 to 25 of 328

 
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