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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Philips 28DW6734 no red
The above model TV started to flicker, losing red then reappearing.
I don't think its the tube (guaranteed anyway), bt somewhere in the gun drive. CAn someone point me at a website with the schematics? I'm afraid my tv/analogue skills are rather weak as I'm a VHDL/FPGA designer. Any help welcome. (Also, my old 'scope burnt out, so diagnostics are difficult as well!). TIA, Niv |
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#2
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Philips 28DW6734 no red
Niv wrote:
The above model TV started to flicker, losing red then reappearing. so a bad connection I don't think its the tube (guaranteed anyway), bt somewhere in the gun drive. right CAn someone point me at a website with the schematics? I'm afraid my tv/analogue skills are rather weak as I'm a VHDL/FPGA designer. Any help welcome. (Also, my old 'scope burnt out, so diagnostics are difficult as well!). TIA, Niv You only need a multimeter to track it down. Youve got 3 colour channels to compare too which makes things easier. I'd start at the tube cathode and work back, see where things start to line up between the 3 channels. NT |
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#3
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Philips 28DW6734 no red
Niv ha escrito: The above model TV started to flicker, losing red then reappearing. I don't think its the tube (guaranteed anyway), bt somewhere in the gun drive. start by resoldering crt neck board etc. sounds like bad joint . may have led to the red resistor opening -B. |
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#4
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Philips 28DW6734 no red
Niv wrote: The above model TV started to flicker, losing red then reappearing. I don't think its the tube (guaranteed anyway), bt somewhere in the gun drive. CAn someone point me at a website with the schematics? I'm afraid my tv/analogue skills are rather weak as I'm a VHDL/FPGA designer. Any help welcome. (Also, my old 'scope burnt out, so diagnostics are difficult as well!). TIA, Niv Never hear of a Protron losing reds and reappearing, now do we? |
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