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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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HOT slowly overheating
I`m working on a 9`` Orion tv dvd combo 2003 model , same set as the
Toshibas for those familiar with these . It uses a samsung chassis with a small size package HOT . Ths set had HOT shorted and the board under the HOT was browned from heat . I replaced the HOT with a good original part from a smashed tv set . This set now works just fine but after around an hour the HOT tiny heat sink gets to hot to keep a finger on . I have ESR tested capacitors in the osc circuit and swapped out the osc coil but still gets hot . I am suspecting the flyback ?? Comments ? |
#2
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HOT slowly overheating
If everything else seems ok, ie, picture and deflection are ok, can you
increase the heat sink size somehow? Maybe a bad design from the beginning. H. R.(Bob) Hofmann Ken G. wrote: I`m working on a 9`` Orion tv dvd combo 2003 model , same set as the Toshibas for those familiar with these . It uses a samsung chassis with a small size package HOT . Ths set had HOT shorted and the board under the HOT was browned from heat . I replaced the HOT with a good original part from a smashed tv set . This set now works just fine but after around an hour the HOT tiny heat sink gets to hot to keep a finger on . I have ESR tested capacitors in the osc circuit and swapped out the osc coil but still gets hot . I am suspecting the flyback ?? Comments ? |
#3
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HOT slowly overheating
Ken G. wrote: I`m working on a 9`` Orion tv dvd combo 2003 model , same set as the Toshibas for those familiar with these . It uses a samsung chassis with a small size package HOT . Ths set had HOT shorted and the board under the HOT was browned from heat . I replaced the HOT with a good original part from a smashed tv set . This set now works just fine but after around an hour the HOT tiny heat sink gets to hot to keep a finger on . I have ESR tested capacitors in the osc circuit and swapped out the osc coil but still gets hot . I am suspecting the flyback ?? Comments ? Either the heat sink is way undersized or the retrace tuning cap may be leaky. Sounds like more HS surface area is a good idea either way. |
#4
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HOT slowly overheating
Ken G. wrote: I`m working on a 9`` Orion tv dvd combo 2003 model , same set as the Toshibas for those familiar with these . what did I tell you otter****er? Orion does make crappy tvs for Toshiba. |
#6
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HOT slowly overheating
Ken G. wrote: I replaced the HOT with a good original part from a smashed tv set . This set now works just fine but after around an hour the HOT tiny heat sink gets to hot to keep a finger on . of course it's going to get hot. It's a HEAT SINK. What part of that don't you understand, you dumb mother****er? |
#7
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HOT slowly overheating
I have worked on several of the Toshiba with the same exact heat sink
and HOT and chassis and never found one till now that got hot like this The picture shows no sign of any problems . My next step was to put in the flyback from the smashed set ... THANKS .. Today i also found another 02. 9`` set that had a shorted picture tube only it had a vcr in it but same exact HOT . Fylback # ?? I thought of adding more heat sink but thats not always the best thing to do . |
#8
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HOT slowly overheating
of course it's going to get hot. It's a HEAT SINK. What part of that
don't you understand, I love you and i want more ! |
#9
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HOT slowly overheating
Let us know what finally happens. (about the tv that is )
H. R. Hofman Ken G. wrote: I have worked on several of the Toshiba with the same exact heat sink and HOT and chassis and never found one till now that got hot like this The picture shows no sign of any problems . My next step was to put in the flyback from the smashed set ... THANKS . Today i also found another 02. 9`` set that had a shorted picture tube only it had a vcr in it but same exact HOT . Fylback # ?? I thought of adding more heat sink but thats not always the best thing to do . |
#11
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HOT slowly overheating
Ken G. ha escrito: I have worked on several of the Toshiba with the same exact heat sink and HOT and chassis and never found one till now that got hot like this The picture shows no sign of any problems . My next step was to put in the flyback from the smashed set ... THANKS . Today i also found another 02. 9`` set that had a shorted picture tube only it had a vcr in it but same exact HOT . Fylback # ?? I thought of adding more heat sink but thats not always the best thing to do . did you just esr the caps in the hor drive cct or actually change them? -B. |
#12
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HOT slowly overheating
(Ken G.) writes:
of course it's going to get hot. It's a HEAT SINK. What part of that don't you understand, I love you and i want more ! A properly designed and functioning HOT should not get hot. Either a problem with the drive or the output circuit can result in excessive dissipation in the HOT. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#13
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HOT slowly overheating
Sam Goldwasser ha escrito: (Ken G.) writes: of course it's going to get hot. It's a HEAT SINK. What part of that don't you understand, I love you and i want more ! A properly designed and functioning HOT should not get hot. You haven't worked on many Samsungs , have you! ;-) they're so mean with the metal, piddling little heatsinks mean the trannys always seem to run hot but somehow they work. also some of the the newer sharps and daewoos don't even heat sink the HOT :-o -ben |
#14
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HOT slowly overheating
Sam Goldwasser wrote: (Ken G.) writes: A properly designed and functioning HOT should not get hot. Either a problem with the drive or the output circuit can result in excessive dissipation in the HOT. or maybe he just changing the channels too fast. |
#15
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HOT slowly overheating
"b" writes:
Sam Goldwasser ha escrito: (Ken G.) writes: of course it's going to get hot. It's a HEAT SINK. What part of that don't you understand, I love you and i want more ! A properly designed and functioning HOT should not get hot. You haven't worked on many Samsungs , have you! ;-) they're so mean with the metal, piddling little heatsinks mean the trannys always seem to run hot but somehow they work. also some of the the newer sharps and daewoos don't even heat sink the HOT :-o Right. Note the part about "properly designed". --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#17
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HOT slowly overheating
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#18
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HOT slowly overheating fix
Ok i finally got back to this thread . I only ESR the caps , i didnt
change any . I did however take the flyback off the newly found set and put it in the overheating set and the overheating stopped . I left the set on all night long and in the morning the HOT heat sink was only slightly warm . I know these tv sets are cheaply made and all but this whole project was free accept my time and this is what people buy and want fixed so fix i will . The little set has a DVD in it and a 12 volt jack and still looks like new . Someone will like it . Thanks for all the pointers and technical info . |
#19
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HOT slowly overheating
On 28 Dec 2006 10:06:28 -0800, "b" put
finger to keyboard and composed: Sam Goldwasser ha escrito: (Ken G.) writes: of course it's going to get hot. It's a HEAT SINK. What part of that don't you understand, I love you and i want more ! A properly designed and functioning HOT should not get hot. You haven't worked on many Samsungs , have you! ;-) they're so mean with the metal, piddling little heatsinks mean the trannys always seem to run hot but somehow they work. also some of the the newer sharps and daewoos don't even heat sink the HOT :-o -ben Why Do Apparently Similar or Better HOTs Sometimes Run Hot: http://www.repairfaq.org/sam/deflfaq.htm#dsasb Typical HOT Dissipation: http://www.repairfaq.org/sam/deflfaq.htm#dsthd Here is an excerpt from the aforementioned URL: ================================================== ============= Here are some measured values for TV HOTs with optimized drive: (From: David, a Philips application engineer). 14-21", 16 kHz: About 1 W (some have the HOT running in free-air) 21-36", 16 kHz: Less than 2 W (some new large CRT's only need 9 A p-p) 25-36", 32 kHz: Less than 4 W (dissipation really is prop. to frequency) ================================================== ============= - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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